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ruanhaishen
redis
Commits
164b6bba
Commit
164b6bba
authored
May 19, 2015
by
antirez
Browse files
Merge branch 'sentinel-32' into unstable
parents
eb138f15
d614f1c3
Changes
2
Hide whitespace changes
Inline
Side-by-side
src/sentinel.c
View file @
164b6bba
...
...
@@ -54,19 +54,18 @@ typedef struct sentinelAddr {
#define SRI_MASTER (1<<0)
#define SRI_SLAVE (1<<1)
#define SRI_SENTINEL (1<<2)
#define SRI_DISCONNECTED (1<<3)
#define SRI_S_DOWN (1<<4)
/* Subjectively down (no quorum). */
#define SRI_O_DOWN (1<<5)
/* Objectively down (confirmed by others). */
#define SRI_MASTER_DOWN (1<<6)
/* A Sentinel with this flag set thinks that
#define SRI_S_DOWN (1<<3) /* Subjectively down (no quorum). */
#define SRI_O_DOWN (1<<4) /* Objectively down (confirmed by others). */
#define SRI_MASTER_DOWN (1<<5) /* A Sentinel with this flag set thinks that
its master is down. */
#define SRI_FAILOVER_IN_PROGRESS (1<<
7
)
/* Failover is in progress for
#define SRI_FAILOVER_IN_PROGRESS (1<<
6
) /* Failover is in progress for
this master. */
#define SRI_PROMOTED (1<<
8
)
/* Slave selected for promotion. */
#define SRI_RECONF_SENT (1<<
9
)
/* SLAVEOF <newmaster> sent. */
#define SRI_RECONF_INPROG (1<<
10
)
/* Slave synchronization in progress. */
#define SRI_RECONF_DONE (1<<1
1
)
/* Slave synchronized with new master. */
#define SRI_FORCE_FAILOVER (1<<1
2
)
/* Force failover with master up. */
#define SRI_SCRIPT_KILL_SENT (1<<1
3
)
/* SCRIPT KILL already sent on -BUSY */
#define SRI_PROMOTED (1<<
7
) /* Slave selected for promotion. */
#define SRI_RECONF_SENT (1<<
8
) /* SLAVEOF <newmaster> sent. */
#define SRI_RECONF_INPROG (1<<
9
) /* Slave synchronization in progress. */
#define SRI_RECONF_DONE (1<<1
0
) /* Slave synchronized with new master. */
#define SRI_FORCE_FAILOVER (1<<1
1
) /* Force failover with master up. */
#define SRI_SCRIPT_KILL_SENT (1<<1
2
) /* SCRIPT KILL already sent on -BUSY */
/* Note: times are in milliseconds. */
#define SENTINEL_INFO_PERIOD 10000
...
...
@@ -115,27 +114,54 @@ typedef struct sentinelAddr {
#define SENTINEL_SCRIPT_MAX_RETRY 10
#define SENTINEL_SCRIPT_RETRY_DELAY 30000 /* 30 seconds between retries. */
typedef
struct
sentinelRedisInstance
{
int
flags
;
/* See SRI_... defines */
char
*
name
;
/* Master name from the point of view of this sentinel. */
char
*
runid
;
/* run ID of this instance. */
uint64_t
config_epoch
;
/* Configuration epoch. */
sentinelAddr
*
addr
;
/* Master host. */
/* The link to a sentinelRedisInstance. When we have the same set of Sentinels
* monitoring many masters, we have different instances representing the
* same Sentinels, one per master, and we need to share the hiredis connections
* among them. Oherwise if 5 Sentinels are monitoring 100 masters we create
* 500 outgoing connections instead of 5.
*
* So this structure represents a reference counted link in terms of the two
* hiredis connections for commands and Pub/Sub, and the fields needed for
* failure detection, since the ping/pong time are now local to the link: if
* the link is available, the instance is avaialbe. This way we don't just
* have 5 connections instead of 500, we also send 5 pings instead of 500.
*
* Links are shared only for Sentinels: master and slave instances have
* a link with refcount = 1, always. */
typedef struct instanceLink {
int refcount; /* Number of sentinelRedisInstance owners. */
int disconnected; /* Non-zero if we need to reconnect cc or pc. */
int pending_commands; /* Number of commands sent waiting for a reply. */
redisAsyncContext *cc; /* Hiredis context for commands. */
redisAsyncContext *pc; /* Hiredis context for Pub / Sub. */
int
pending_commands
;
/* Number of commands sent waiting for a reply. */
mstime_t cc_conn_time; /* cc connection time. */
mstime_t pc_conn_time; /* pc connection time. */
mstime_t pc_last_activity; /* Last time we received any message. */
mstime_t last_avail_time; /* Last time the instance replied to ping with
a reply we consider valid. */
mstime_t
last_ping_time
;
/* Last time a pending ping was sent in the
context of the current command connection
with the instance. 0 if still not sent or
if pong already received. */
mstime_t act_ping_time; /* Time at which the last pending ping (no pong
received after it) was sent. This field is
set to 0 when a pong is received, and set again
to the current time if the value is 0 and a new
ping is sent. */
mstime_t last_ping_time; /* Time at which we sent the last ping. This is
only used to avoid sending too many pings
during failure. Idle time is computed using
the act_ping_time field. */
mstime_t last_pong_time; /* Last time the instance replied to ping,
whatever the reply was. That's used to check
if the link is idle and must be reconnected. */
mstime_t last_reconn_time; /* Last reconnection attempt performed when
the link was down. */
} instanceLink;
typedef struct sentinelRedisInstance {
int flags; /* See SRI_... defines */
char *name; /* Master name from the point of view of this sentinel. */
char *runid; /* Run ID of this instance, or unique ID if is a Sentinel.*/
uint64_t config_epoch; /* Configuration epoch. */
sentinelAddr *addr; /* Master host. */
instanceLink *link; /* Link to the instance, may be shared for Sentinels. */
mstime_t last_pub_time; /* Last time we sent hello via Pub/Sub. */
mstime_t last_hello_time; /* Only used if SRI_SENTINEL is set. Last time
we received a hello from this Sentinel
...
...
@@ -195,19 +221,20 @@ typedef struct sentinelRedisInstance {
/* Main state. */
struct sentinelState {
uint64_t
current_epoch
;
/* Current epoch. */
char myid[REDIS_RUN_ID_SIZE+1]; /* This sentinel ID. */
uint64_t current_epoch; /* Current epoch. */
dict *masters; /* Dictionary of master sentinelRedisInstances.
Key is the instance name, value is the
sentinelRedisInstance structure pointer. */
int tilt; /* Are we in TILT mode? */
int running_scripts; /* Number of scripts in execution right now. */
mstime_t
tilt_start_time
;
/* When TITL started. */
mstime_t
previous_time
;
/* Last time we ran the time handler. */
list
*
scripts_queue
;
/* Queue of user scripts to execute. */
char
*
announce_ip
;
/* IP addr that is gossiped to other sentinels if
not NULL. */
int
announce_port
;
/* Port that is gossiped to other sentinels if
non zero. */
mstime_t tilt_start_time;
/* When TITL started. */
mstime_t previous_time;
/* Last time we ran the time handler. */
list *scripts_queue;
/* Queue of user scripts to execute. */
char *announce_ip; /* IP addr that is gossiped to other sentinels if
not NULL. */
int announce_port; /* Port that is gossiped to other sentinels if
non zero. */
} sentinel;
/* A script execution job. */
...
...
@@ -327,8 +354,7 @@ sentinelRedisInstance *sentinelGetMasterByName(char *name);
char *sentinelGetSubjectiveLeader(sentinelRedisInstance *master);
char *sentinelGetObjectiveLeader(sentinelRedisInstance *master);
int yesnotoi(char *s);
void
sentinelDisconnectInstanceFromContext
(
const
redisAsyncContext
*
c
);
void
sentinelKillLink
(
sentinelRedisInstance
*
ri
,
redisAsyncContext
*
c
);
void instanceLinkConnectionError(const redisAsyncContext *c);
const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri);
void sentinelAbortFailover(sentinelRedisInstance *ri);
void sentinelEvent(int level, char *type, sentinelRedisInstance *ri, const char *fmt, ...);
...
...
@@ -342,6 +368,7 @@ void sentinelFlushConfig(void);
void sentinelGenerateInitialMonitorEvents(void);
int sentinelSendPing(sentinelRedisInstance *ri);
int sentinelForceHelloUpdateForMaster(sentinelRedisInstance *master);
sentinelRedisInstance *getSentinelRedisInstanceByAddrAndRunID(dict *instances, char *ip, int port, char *runid);
/* ========================= Dictionary types =============================== */
...
...
@@ -433,12 +460,13 @@ void initSentinel(void) {
sentinel.scripts_queue = listCreate();
sentinel.announce_ip = NULL;
sentinel.announce_port = 0;
memset(sentinel.myid,0,sizeof(sentinel.myid));
}
/* This function gets called when the server is in Sentinel mode, started,
* loaded the configuration, and is ready for normal operations. */
void sentinelIsRunning(void) {
redisLog
(
REDIS_WARNING
,
"Sentinel runid is %s"
,
server
.
runid
)
;
int j
;
if (server.configfile == NULL) {
redisLog(REDIS_WARNING,
...
...
@@ -451,6 +479,21 @@ void sentinelIsRunning(void) {
exit(1);
}
/* If this Sentinel has yet no ID set in the configuration file, we
* pick a random one and persist the config on disk. From now on this
* will be this Sentinel ID across restarts. */
for (j = 0; j < REDIS_RUN_ID_SIZE; j++)
if (sentinel.myid[j] != 0) break;
if (j == REDIS_RUN_ID_SIZE) {
/* Pick ID and presist the config. */
getRandomHexChars(sentinel.myid,REDIS_RUN_ID_SIZE);
sentinelFlushConfig();
}
/* Log its ID to make debugging of issues simpler. */
redisLog(REDIS_WARNING,"Sentinel ID is %s", sentinel.myid);
/* We want to generate a +monitor event for every configured master
* at startup. */
sentinelGenerateInitialMonitorEvents();
...
...
@@ -872,6 +915,193 @@ void sentinelCallClientReconfScript(sentinelRedisInstance *master, int role, cha
state, from->ip, fromport, to->ip, toport, NULL);
}
/* =============================== instanceLink ============================= */
/* Create a not yet connected link object. */
instanceLink *createInstanceLink(void) {
instanceLink *link = zmalloc(sizeof(*link));
link->refcount = 1;
link->disconnected = 1;
link->pending_commands = 0;
link->cc = NULL;
link->pc = NULL;
link->cc_conn_time = 0;
link->pc_conn_time = 0;
link->last_reconn_time = 0;
link->pc_last_activity = 0;
/* We set the act_ping_time to "now" even if we actually don't have yet
* a connection with the node, nor we sent a ping.
* This is useful to detect a timeout in case we'll not be able to connect
* with the node at all. */
link->act_ping_time = mstime();
link->last_ping_time = 0;
link->last_avail_time = mstime();
link->last_pong_time = mstime();
return link;
}
/* Disconnect an hiredis connection in the context of an instance link. */
void instanceLinkCloseConnection(instanceLink *link, redisAsyncContext *c) {
if (c == NULL) return;
if (link->cc == c) {
link->cc = NULL;
link->pending_commands = 0;
}
if (link->pc == c) link->pc = NULL;
c->data = NULL;
link->disconnected = 1;
redisAsyncFree(c);
}
/* Decrement the refcount of a link object, if it drops to zero, actually
* free it and return NULL. Otherwise don't do anything and return the pointer
* to the object.
*
* If we are not going to free the link and ri is not NULL, we rebind all the
* pending requests in link->cc (hiredis connection for commands) to a
* callback that will just ignore them. This is useful to avoid processing
* replies for an instance that no longer exists. */
instanceLink *releaseInstanceLink(instanceLink *link, sentinelRedisInstance *ri)
{
redisAssert(link->refcount > 0);
link->refcount--;
if (link->refcount != 0) {
if (ri && ri->link->cc) {
/* This instance may have pending callbacks in the hiredis async
* context, having as 'privdata' the instance that we are going to
* free. Let's rewrite the callback list, directly exploiting
* hiredis internal data structures, in order to bind them with
* a callback that will ignore the reply at all. */
redisCallback *cb;
redisCallbackList *callbacks = &link->cc->replies;
cb = callbacks->head;
while(cb) {
if (cb->privdata == ri) {
cb->fn = sentinelDiscardReplyCallback;
cb->privdata = NULL; /* Not strictly needed. */
}
cb = cb->next;
}
}
return link; /* Other active users. */
}
instanceLinkCloseConnection(link,link->cc);
instanceLinkCloseConnection(link,link->pc);
zfree(link);
return NULL;
}
/* This function will attempt to share the instance link we already have
* for the same Sentinel in the context of a different master, with the
* instance we are passing as argument.
*
* This way multiple Sentinel objects that refer all to the same physical
* Sentinel instance but in the context of different masters will use
* a single connection, will send a single PING per second for failure
* detection and so forth.
*
* Return REDIS_OK if a matching Sentinel was found in the context of a
* different master and sharing was performed. Otherwise REDIS_ERR
* is returned. */
int sentinelTryConnectionSharing(sentinelRedisInstance *ri) {
redisAssert(ri->flags & SRI_SENTINEL);
dictIterator *di;
dictEntry *de;
if (ri->runid == NULL) return REDIS_ERR; /* No way to identify it. */
if (ri->link->refcount > 1) return REDIS_ERR; /* Already shared. */
di = dictGetIterator(sentinel.masters);
while((de = dictNext(di)) != NULL) {
sentinelRedisInstance *master = dictGetVal(de), *match;
/* We want to share with the same physical Sentinel referenced
* in other masters, so skip our master. */
if (master == ri->master) continue;
match = getSentinelRedisInstanceByAddrAndRunID(master->sentinels,
NULL,0,ri->runid);
if (match == ri) continue; /* Should never happen but... safer. */
/* We identified a matching Sentinel, great! Let's free our link
* and use the one of the matching Sentinel. */
releaseInstanceLink(ri->link,NULL);
ri->link = match->link;
match->link->refcount++;
return REDIS_OK;
}
dictReleaseIterator(di);
return REDIS_ERR;
}
/* When we detect a Sentinel to switch address (reporting a different IP/port
* pair in Hello messages), let's update all the matching Sentinels in the
* context of other masters as well and disconnect the links, so that everybody
* will be updated.
*
* Return the number of updated Sentinel addresses. */
int sentinelUpdateSentinelAddressInAllMasters(sentinelRedisInstance *ri) {
redisAssert(ri->flags & SRI_SENTINEL);
dictIterator *di;
dictEntry *de;
int reconfigured = 0;
di = dictGetIterator(sentinel.masters);
while((de = dictNext(di)) != NULL) {
sentinelRedisInstance *master = dictGetVal(de), *match;
match = getSentinelRedisInstanceByAddrAndRunID(master->sentinels,
NULL,0,ri->runid);
if (match->link->disconnected == 0) {
instanceLinkCloseConnection(match->link,match->link->cc);
instanceLinkCloseConnection(match->link,match->link->pc);
}
if (match == ri) continue; /* Address already updated for it. */
/* Update the address of the matching Sentinel by copying the address
* of the Sentinel object that received the address update. */
releaseSentinelAddr(match->addr);
match->addr = dupSentinelAddr(ri->addr);
reconfigured++;
}
dictReleaseIterator(di);
if (reconfigured)
sentinelEvent(REDIS_NOTICE,"+sentinel-address-update", ri,
"%@ %d additional matching instances", reconfigured);
return reconfigured;
}
/* This function is called when an hiredis connection reported an error.
* We set it to NULL and mark the link as disconnected so that it will be
* reconnected again.
*
* Note: we don't free the hiredis context as hiredis will do it for us
* for async connections. */
void instanceLinkConnectionError(const redisAsyncContext *c) {
instanceLink *link = c->data;
int pubsub;
if (!link) return;
pubsub = (link->pc == c);
if (pubsub)
link->pc = NULL;
else
link->cc = NULL;
link->disconnected = 1;
}
/* Hiredis connection established / disconnected callbacks. We need them
* just to cleanup our link state. */
void sentinelLinkEstablishedCallback(const redisAsyncContext *c, int status) {
if (status != REDIS_OK) instanceLinkConnectionError(c);
}
void sentinelDisconnectCallback(const redisAsyncContext *c, int status) {
REDIS_NOTUSED(status);
instanceLinkConnectionError(c);
}
/* ========================== sentinelRedisInstance ========================= */
/* Create a redis instance, the following fields must be populated by the
...
...
@@ -894,6 +1124,7 @@ void sentinelCallClientReconfScript(sentinelRedisInstance *master, int role, cha
*
* The function may also fail and return NULL with errno set to EBUSY if
* a master or slave with the same name already exists. */
sentinelRedisInstance *createSentinelRedisInstance(char *name, int flags, char *hostname, int port, int quorum, sentinelRedisInstance *master) {
sentinelRedisInstance *ri;
sentinelAddr *addr;
...
...
@@ -932,24 +1163,12 @@ sentinelRedisInstance *createSentinelRedisInstance(char *name, int flags, char *
ri = zmalloc(sizeof(*ri));
/* Note that all the instances are started in the disconnected state,
* the event loop will take care of connecting them. */
ri
->
flags
=
flags
|
SRI_DISCONNECTED
;
ri->flags = flags;
ri->name = sdsname;
ri->runid = NULL;
ri->config_epoch = 0;
ri->addr = addr;
ri
->
cc
=
NULL
;
ri
->
pc
=
NULL
;
ri
->
pending_commands
=
0
;
ri
->
cc_conn_time
=
0
;
ri
->
pc_conn_time
=
0
;
ri
->
pc_last_activity
=
0
;
/* We set the last_ping_time to "now" even if we actually don't have yet
* a connection with the node, nor we sent a ping.
* This is useful to detect a timeout in case we'll not be able to connect
* with the node at all. */
ri
->
last_ping_time
=
mstime
();
ri
->
last_avail_time
=
mstime
();
ri
->
last_pong_time
=
mstime
();
ri->link = createInstanceLink();
ri->last_pub_time = mstime();
ri->last_hello_time = mstime();
ri->last_master_down_reply_time = mstime();
...
...
@@ -1005,9 +1224,8 @@ void releaseSentinelRedisInstance(sentinelRedisInstance *ri) {
dictRelease(ri->sentinels);
dictRelease(ri->slaves);
/* Release hiredis connections. */
if
(
ri
->
cc
)
sentinelKillLink
(
ri
,
ri
->
cc
);
if
(
ri
->
pc
)
sentinelKillLink
(
ri
,
ri
->
pc
);
/* Disconnect the instance. */
releaseInstanceLink(ri->link,ri);
/* Free other resources. */
sdsfree(ri->name);
...
...
@@ -1051,35 +1269,29 @@ const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri) {
else return "unknown";
}
/* This function removes all the instances found in the dictionary of
* sentinels in the specified 'master', having either:
*
* 1) The same ip/port as specified.
* 2) The same runid.
/* This function remove the Sentinel with the specified ID from the
* specified master.
*
* "1" and "2" don't need to verify at the same time, just one is enough.
* If "runid" is NULL it is not checked.
* Similarly if "ip" is NULL it is not checked.
* If "runid" is NULL the function returns ASAP.
*
* This function is useful because every time we add a new Sentinel into
* a master's Sentinels dictionary, we want to be very sure about not
* having duplicated instances for any reason. This is important because
* other sentinels are needed to reach ODOWN quorum, and later to get
* voted for a given configuration epoch in order to perform the failover.
* This function is useful because on Sentinels address switch, we want to
* remove our old entry and add a new one for the same ID but with the new
* address.
*
* The function returns the number of Sentinels removed. */
int
removeMatchingSentinelsFromMaster
(
sentinelRedisInstance
*
master
,
char
*
ip
,
int
port
,
char
*
runid
)
{
* The function returns 1 if the matching Sentinel was removed, otherwise
* 0 if there was no Sentinel with this ID. */
int removeMatchingSentinelFromMaster(sentinelRedisInstance *master, char *runid) {
dictIterator *di;
dictEntry *de;
int removed = 0;
if (runid == NULL) return 0;
di = dictGetSafeIterator(master->sentinels);
while((de = dictNext(di)) != NULL) {
sentinelRedisInstance *ri = dictGetVal(de);
if
((
ri
->
runid
&&
runid
&&
strcmp
(
ri
->
runid
,
runid
)
==
0
)
||
(
ip
&&
strcmp
(
ri
->
addr
->
ip
,
ip
)
==
0
&&
port
==
ri
->
addr
->
port
))
{
if (ri->runid && strcmp(ri->runid,runid) == 0) {
dictDelete(master->sentinels,ri->name);
removed++;
}
...
...
@@ -1172,9 +1384,9 @@ void sentinelResetMaster(sentinelRedisInstance *ri, int flags) {
dictRelease(ri->sentinels);
ri->sentinels = dictCreate(&instancesDictType,NULL);
}
i
f
(
ri
->
cc
)
sentinelKillL
ink
(
ri
,
ri
->
cc
);
i
f
(
ri
->
pc
)
sentinelKillL
ink
(
ri
,
ri
->
pc
);
ri
->
flags
&=
SRI_MASTER
|
SRI_DISCONNECTED
;
i
nstanceLinkCloseConnection(ri->l
ink
,
ri
->link
->cc);
i
nstanceLinkCloseConnection(ri->l
ink
,
ri
->link
->pc);
ri->flags &= SRI_MASTER;
if (ri->leader) {
sdsfree(ri->leader);
ri->leader = NULL;
...
...
@@ -1187,9 +1399,10 @@ void sentinelResetMaster(sentinelRedisInstance *ri, int flags) {
sdsfree(ri->slave_master_host);
ri->runid = NULL;
ri->slave_master_host = NULL;
ri
->
last_ping_time
=
mstime
();
ri
->
last_avail_time
=
mstime
();
ri
->
last_pong_time
=
mstime
();
ri->link->act_ping_time = mstime();
ri->link->last_ping_time = 0;
ri->link->last_avail_time = mstime();
ri->link->last_pong_time = mstime();
ri->role_reported_time = mstime();
ri->role_reported = SRI_MASTER;
if (flags & SENTINEL_GENERATE_EVENT)
...
...
@@ -1329,6 +1542,13 @@ void sentinelPropagateDownAfterPeriod(sentinelRedisInstance *master) {
}
}
char *sentinelGetInstanceTypeString(sentinelRedisInstance *ri) {
if (ri->flags & SRI_MASTER) return "master";
else if (ri->flags & SRI_SLAVE) return "slave";
else if (ri->flags & SRI_SENTINEL) return "sentinel";
else return "unknown";
}
/* ============================ Config handling ============================= */
char *sentinelHandleConfiguration(char **argv, int argc) {
sentinelRedisInstance *ri;
...
...
@@ -1392,6 +1612,10 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
unsigned long long current_epoch = strtoull(argv[1],NULL,10);
if (current_epoch > sentinel.current_epoch)
sentinel.current_epoch = current_epoch;
} else if (!strcasecmp(argv[0],"myid") && argc == 2) {
if (strlen(argv[1]) != REDIS_RUN_ID_SIZE)
return "Malformed Sentinel id in myid option.";
memcpy(sentinel.myid,argv[1],REDIS_RUN_ID_SIZE);
} else if (!strcasecmp(argv[0],"config-epoch") && argc == 3) {
/* config-epoch <name> <epoch> */
ri = sentinelGetMasterByName(argv[1]);
...
...
@@ -1430,7 +1654,10 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
{
return "Wrong hostname or port for sentinel.";
}
if
(
argc
==
5
)
si
->
runid
=
sdsnew
(
argv
[
4
]);
if (argc == 5) {
si->runid = sdsnew(argv[4]);
sentinelTryConnectionSharing(si);
}
} else if (!strcasecmp(argv[0],"announce-ip") && argc == 2) {
/* announce-ip <ip-address> */
if (strlen(argv[1]))
...
...
@@ -1454,6 +1681,10 @@ void rewriteConfigSentinelOption(struct rewriteConfigState *state) {
dictEntry *de;
sds line;
/* sentinel unique ID. */
line = sdscatprintf(sdsempty(), "sentinel myid %s", sentinel.myid);
rewriteConfigRewriteLine(state,"sentinel",line,1);
/* For every master emit a "sentinel monitor" config entry. */
di = dictGetIterator(sentinel.masters);
while((de = dictNext(di)) != NULL) {
...
...
@@ -1615,57 +1846,6 @@ werr:
/* ====================== hiredis connection handling ======================= */
/* Completely disconnect a hiredis link from an instance. */
void
sentinelKillLink
(
sentinelRedisInstance
*
ri
,
redisAsyncContext
*
c
)
{
if
(
ri
->
cc
==
c
)
{
ri
->
cc
=
NULL
;
ri
->
pending_commands
=
0
;
}
if
(
ri
->
pc
==
c
)
ri
->
pc
=
NULL
;
c
->
data
=
NULL
;
ri
->
flags
|=
SRI_DISCONNECTED
;
redisAsyncFree
(
c
);
}
/* This function takes a hiredis context that is in an error condition
* and make sure to mark the instance as disconnected performing the
* cleanup needed.
*
* Note: we don't free the hiredis context as hiredis will do it for us
* for async connections. */
void
sentinelDisconnectInstanceFromContext
(
const
redisAsyncContext
*
c
)
{
sentinelRedisInstance
*
ri
=
c
->
data
;
int
pubsub
;
if
(
ri
==
NULL
)
return
;
/* The instance no longer exists. */
pubsub
=
(
ri
->
pc
==
c
);
sentinelEvent
(
REDIS_DEBUG
,
pubsub
?
"-pubsub-link"
:
"-cmd-link"
,
ri
,
"%@ #%s"
,
c
->
errstr
);
if
(
pubsub
)
ri
->
pc
=
NULL
;
else
ri
->
cc
=
NULL
;
ri
->
flags
|=
SRI_DISCONNECTED
;
}
void
sentinelLinkEstablishedCallback
(
const
redisAsyncContext
*
c
,
int
status
)
{
if
(
status
!=
REDIS_OK
)
{
sentinelDisconnectInstanceFromContext
(
c
);
}
else
{
sentinelRedisInstance
*
ri
=
c
->
data
;
int
pubsub
=
(
ri
->
pc
==
c
);
sentinelEvent
(
REDIS_DEBUG
,
pubsub
?
"+pubsub-link"
:
"+cmd-link"
,
ri
,
"%@"
);
}
}
void
sentinelDisconnectCallback
(
const
redisAsyncContext
*
c
,
int
status
)
{
REDIS_NOTUSED
(
status
);
sentinelDisconnectInstanceFromContext
(
c
);
}
/* Send the AUTH command with the specified master password if needed.
* Note that for slaves the password set for the master is used.
*
...
...
@@ -1677,8 +1857,8 @@ void sentinelSendAuthIfNeeded(sentinelRedisInstance *ri, redisAsyncContext *c) {
ri->master->auth_pass;
if (auth_pass) {
if
(
redisAsyncCommand
(
c
,
sentinelDiscardReplyCallback
,
NULL
,
"AUTH %s"
,
auth_pass
)
==
REDIS_OK
)
ri
->
pending_commands
++
;
if (redisAsyncCommand(c, sentinelDiscardReplyCallback,
ri
, "AUTH %s",
auth_pass) == REDIS_OK) ri->
link->
pending_commands++;
}
}
...
...
@@ -1691,77 +1871,82 @@ void sentinelSendAuthIfNeeded(sentinelRedisInstance *ri, redisAsyncContext *c) {
void sentinelSetClientName(sentinelRedisInstance *ri, redisAsyncContext *c, char *type) {
char name[64];
snprintf
(
name
,
sizeof
(
name
),
"sentinel-%.8s-%s"
,
se
rver
.
run
id
,
type
);
if
(
redisAsyncCommand
(
c
,
sentinelDiscardReplyCallback
,
NULL
,
snprintf(name,sizeof(name),"sentinel-%.8s-%s",se
ntinel.my
id,type);
if (redisAsyncCommand(c, sentinelDiscardReplyCallback,
ri
,
"CLIENT SETNAME %s", name) == REDIS_OK)
{
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
}
}
/* Create the async connections for the
specified
instance if the in
stance
* is disconnected. Note that
the SRI_DISCONNECTED flag is set
even if just
/* Create the async connections for the instance
link
if the
l
in
k
* is disconnected. Note that
link->disconnected is true
even if just
* one of the two links (commands and pub/sub) is missing. */
void sentinelReconnectInstance(sentinelRedisInstance *ri) {
if
(
!
(
ri
->
flags
&
SRI_DISCONNECTED
))
return
;
if (ri->link->disconnected == 0) return;
instanceLink *link = ri->link;
mstime_t now = mstime();
if (now - ri->link->last_reconn_time < SENTINEL_PING_PERIOD) return;
ri->link->last_reconn_time = now;
/* Commands connection. */
if
(
ri
->
cc
==
NULL
)
{
ri
->
cc
=
redisAsyncConnectBind
(
ri
->
addr
->
ip
,
ri
->
addr
->
port
,
REDIS_BIND_ADDR
);
if
(
ri
->
cc
->
err
)
{
if (
link
->cc == NULL) {
link
->cc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,REDIS_BIND_ADDR);
if (
link
->cc->err) {
sentinelEvent(REDIS_DEBUG,"-cmd-link-reconnection",ri,"%@ #%s",
ri
->
cc
->
errstr
);
sentinelKillLink
(
ri
,
ri
->
cc
);
link
->cc->errstr);
instanceLinkCloseConnection(link,link
->cc);
} else {
ri
->
cc_conn_time
=
mstime
();
ri
->
cc
->
data
=
ri
;
redisAeAttach
(
server
.
el
,
ri
->
cc
);
redisAsyncSetConnectCallback
(
ri
->
cc
,
sentinelLinkEstablishedCallback
);
redisAsyncSetDisconnectCallback
(
ri
->
cc
,
sentinelDisconnectCallback
);
sentinelSendAuthIfNeeded
(
ri
,
ri
->
cc
);
sentinelSetClientName
(
ri
,
ri
->
cc
,
"cmd"
);
link
->cc_conn_time = mstime();
link
->cc->data =
link
;
redisAeAttach(server.el,
link
->cc);
redisAsyncSetConnectCallback(
link
->cc,
sentinelLinkEstablishedCallback);
redisAsyncSetDisconnectCallback(
link
->cc,
sentinelDisconnectCallback);
sentinelSendAuthIfNeeded(ri,
link
->cc);
sentinelSetClientName(ri,
link
->cc,"cmd");
/* Send a PING ASAP when reconnecting. */
sentinelSendPing(ri);
}
}
/* Pub / Sub */
if
((
ri
->
flags
&
(
SRI_MASTER
|
SRI_SLAVE
))
&&
ri
->
pc
==
NULL
)
{
ri
->
pc
=
redisAsyncConnectBind
(
ri
->
addr
->
ip
,
ri
->
addr
->
port
,
REDIS_BIND_ADDR
);
if
(
ri
->
pc
->
err
)
{
if ((ri->flags & (SRI_MASTER|SRI_SLAVE)) &&
link
->pc == NULL) {
link
->pc = redisAsyncConnectBind(ri->addr->ip,ri->addr->port,REDIS_BIND_ADDR);
if (
link
->pc->err) {
sentinelEvent(REDIS_DEBUG,"-pubsub-link-reconnection",ri,"%@ #%s",
ri
->
pc
->
errstr
);
sentinelKillLink
(
ri
,
ri
->
pc
);
link
->pc->errstr);
instanceLinkCloseConnection(link,link
->pc);
} else {
int retval;
ri
->
pc_conn_time
=
mstime
();
ri
->
pc
->
data
=
ri
;
redisAeAttach
(
server
.
el
,
ri
->
pc
);
redisAsyncSetConnectCallback
(
ri
->
pc
,
sentinelLinkEstablishedCallback
);
redisAsyncSetDisconnectCallback
(
ri
->
pc
,
sentinelDisconnectCallback
);
sentinelSendAuthIfNeeded
(
ri
,
ri
->
pc
);
sentinelSetClientName
(
ri
,
ri
->
pc
,
"pubsub"
);
link
->pc_conn_time = mstime();
link
->pc->data =
link
;
redisAeAttach(server.el,
link
->pc);
redisAsyncSetConnectCallback(
link
->pc,
sentinelLinkEstablishedCallback);
redisAsyncSetDisconnectCallback(
link
->pc,
sentinelDisconnectCallback);
sentinelSendAuthIfNeeded(ri,
link
->pc);
sentinelSetClientName(ri,
link
->pc,"pubsub");
/* Now we subscribe to the Sentinels "Hello" channel. */
retval
=
redisAsyncCommand
(
ri
->
pc
,
sentinelReceiveHelloMessages
,
NULL
,
"SUBSCRIBE %s"
,
retval = redisAsyncCommand(
link
->pc,
sentinelReceiveHelloMessages,
ri
, "SUBSCRIBE %s",
SENTINEL_HELLO_CHANNEL);
if (retval != REDIS_OK) {
/* If we can't subscribe, the Pub/Sub connection is useless
* and we can simply disconnect it and try again. */
sentinelKillLink
(
ri
,
ri
->
pc
);
instanceLinkCloseConnection(link,link
->pc);
return;
}
}
}
/* Clear the
DISCONNECTED flag
s only if we have both the connections
/* Clear the
disconnected statu
s only if we have both the connections
* (or just the commands connection if this is a sentinel instance). */
if
(
ri
->
cc
&&
(
ri
->
flags
&
SRI_SENTINEL
||
ri
->
pc
))
ri
->
flags
&=
~
SRI_DISCONNECTED
;
if (
link
->cc && (ri->flags & SRI_SENTINEL ||
link
->pc))
link->disconnected = 0
;
}
/* ======================== Redis instances pinging ======================== */
...
...
@@ -2030,36 +2215,35 @@ void sentinelRefreshInstanceInfo(sentinelRedisInstance *ri, const char *info) {
}
void sentinelInfoReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
sentinelRedisInstance *ri = privdata;
instanceLink *link = c->data;
redisReply *r;
REDIS_NOTUSED
(
privdata
);
if
(
ri
)
ri
->
pending_commands
--
;
if
(
!
reply
||
!
ri
)
return
;
if (
!reply || !link) return
;
link->pending_commands--
;
r = reply;
if
(
r
->
type
==
REDIS_REPLY_STRING
)
{
if (r->type == REDIS_REPLY_STRING)
sentinelRefreshInstanceInfo(ri,r->str);
}
}
/* Just discard the reply. We use this when we are not monitoring the return
* value of the command but its effects directly. */
void sentinelDiscardReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
instanceLink *link
= c->data;
REDIS_NOTUSED(reply);
REDIS_NOTUSED(privdata);
if
(
ri
)
ri
->
pending_commands
--
;
if (
link) link
->pending_commands--;
}
void sentinelPingReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
sentinelRedisInstance *ri = privdata;
instanceLink *link = c->data;
redisReply *r;
REDIS_NOTUSED
(
privdata
);
if
(
ri
)
ri
->
pending_commands
--
;
if
(
!
reply
||
!
ri
)
return
;
if (
!reply || !link) return
;
link->pending_commands--
;
r = reply;
if (r->type == REDIS_REPLY_STATUS ||
...
...
@@ -2070,8 +2254,8 @@ void sentinelPingReplyCallback(redisAsyncContext *c, void *reply, void *privdata
strncmp(r->str,"LOADING",7) == 0 ||
strncmp(r->str,"MASTERDOWN",10) == 0)
{
ri
->
last_avail_time
=
mstime
();
ri
->
las
t_ping_time
=
0
;
/* Flag the pong as received. */
link
->last_avail_time = mstime();
link->ac
t_ping_time = 0; /* Flag the pong as received. */
} else {
/* Send a SCRIPT KILL command if the instance appears to be
* down because of a busy script. */
...
...
@@ -2079,26 +2263,26 @@ void sentinelPingReplyCallback(redisAsyncContext *c, void *reply, void *privdata
(ri->flags & SRI_S_DOWN) &&
!(ri->flags & SRI_SCRIPT_KILL_SENT))
{
if
(
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
if (redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
,
"SCRIPT KILL") == REDIS_OK)
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
ri->flags |= SRI_SCRIPT_KILL_SENT;
}
}
}
ri
->
last_pong_time
=
mstime
();
link
->last_pong_time = mstime();
}
/* This is called when we get the reply about the PUBLISH command we send
* to the master to advertise this sentinel. */
void sentinelPublishReplyCallback(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
sentinelRedisInstance *ri = privdata;
instanceLink *link = c->data;
redisReply *r;
REDIS_NOTUSED
(
privdata
);
if
(
ri
)
ri
->
pending_commands
--
;
if
(
!
reply
||
!
ri
)
return
;
if (
!reply || !link) return
;
link->pending_commands--
;
r = reply;
/* Only update pub_time if we actually published our message. Otherwise
...
...
@@ -2136,25 +2320,25 @@ void sentinelProcessHelloMessage(char *hello, int hello_len) {
if (!si) {
/* If not, remove all the sentinels that have the same runid
* OR the same ip/port, because it's either a restart or a
* network topology change. */
removed
=
removeMatchingSentinelsFromMaster
(
master
,
token
[
0
],
port
,
token
[
2
]);
* because there was an address change, and add the same Sentinel
* with the new address back. */
removed = removeMatchingSentinelFromMaster(master,token[2]);
if (removed) {
sentinelEvent
(
REDIS_NOTICE
,
"-dup-sentinel"
,
master
,
"%@ #duplicate of %s:%d or %s"
,
token
[
0
],
port
,
token
[
2
]);
sentinelEvent(REDIS_NOTICE,"+sentinel-address-switch",master,
"%@ ip %s port %d for %s", token[0],port,token[2]);
}
/* Add the new sentinel. */
si = createSentinelRedisInstance(NULL,SRI_SENTINEL,
token[0],port,master->quorum,master);
if (si) {
sentinelEvent
(
REDIS_NOTICE
,
"+sentinel"
,
si
,
"%@"
);
if (!removed)
sentinelEvent(REDIS_NOTICE,"+sentinel",si,"%@");
/* The runid is NULL after a new instance creation and
* for Sentinels we don't have a later chance to fill it,
* so do it now. */
si->runid = sdsnew(token[2]);
sentinelTryConnectionSharing(si);
if (removed) sentinelUpdateSentinelAddressInAllMasters(si);
sentinelFlushConfig();
}
}
...
...
@@ -2203,9 +2387,9 @@ cleanup:
/* This is our Pub/Sub callback for the Hello channel. It's useful in order
* to discover other sentinels attached at the same master. */
void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
sentinelRedisInstance *ri =
priv
data;
redisReply *r;
REDIS_NOTUSED
(
privdata
);
REDIS_NOTUSED(
c
);
if (!reply || !ri) return;
r = reply;
...
...
@@ -2213,7 +2397,7 @@ void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privd
/* Update the last activity in the pubsub channel. Note that since we
* receive our messages as well this timestamp can be used to detect
* if the link is probably disconnected even if it seems otherwise. */
ri
->
pc_last_activity
=
mstime
();
ri->
link->
pc_last_activity = mstime();
/* Sanity check in the reply we expect, so that the code that follows
* can avoid to check for details. */
...
...
@@ -2225,7 +2409,7 @@ void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privd
strcmp(r->element[0]->str,"message") != 0) return;
/* We are not interested in meeting ourselves */
if
(
strstr
(
r
->
element
[
2
]
->
str
,
se
rver
.
run
id
)
!=
NULL
)
return
;
if (strstr(r->element[2]->str,se
ntinel.my
id) != NULL) return;
sentinelProcessHelloMessage(r->element[2]->str, r->element[2]->len);
}
...
...
@@ -2250,14 +2434,14 @@ int sentinelSendHello(sentinelRedisInstance *ri) {
sentinelRedisInstance *master = (ri->flags & SRI_MASTER) ? ri : ri->master;
sentinelAddr *master_addr = sentinelGetCurrentMasterAddress(master);
if
(
ri
->
flags
&
SRI_DISCONNECTED
)
return
REDIS_ERR
;
if (ri->
link->disconnected
) return REDIS_ERR;
/* Use the specified announce address if specified, otherwise try to
* obtain our own IP address. */
if (sentinel.announce_ip) {
announce_ip = sentinel.announce_ip;
} else {
if
(
anetSockName
(
ri
->
cc
->
c
.
fd
,
ip
,
sizeof
(
ip
),
NULL
)
==
-
1
)
if (anetSockName(ri->
link->
cc->c.fd,ip,sizeof(ip),NULL) == -1)
return REDIS_ERR;
announce_ip = ip;
}
...
...
@@ -2268,16 +2452,16 @@ int sentinelSendHello(sentinelRedisInstance *ri) {
snprintf(payload,sizeof(payload),
"%s,%d,%s,%llu," /* Info about this sentinel. */
"%s,%s,%d,%llu", /* Info about current master. */
announce_ip
,
announce_port
,
se
rver
.
run
id
,
announce_ip, announce_port, se
ntinel.my
id,
(unsigned long long) sentinel.current_epoch,
/* --- */
master->name,master_addr->ip,master_addr->port,
(unsigned long long) master->config_epoch);
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelPublishReplyCallback
,
NULL
,
"PUBLISH %s %s"
,
retval = redisAsyncCommand(ri->
link->
cc,
sentinelPublishReplyCallback,
ri
, "PUBLISH %s %s",
SENTINEL_HELLO_CHANNEL,payload);
if (retval != REDIS_OK) return REDIS_ERR;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
return REDIS_OK;
}
...
...
@@ -2313,20 +2497,22 @@ int sentinelForceHelloUpdateForMaster(sentinelRedisInstance *master) {
return REDIS_OK;
}
/* Send a PING to the specified instance and refresh the
las
t_ping_time
/* Send a PING to the specified instance and refresh the
ac
t_ping_time
* if it is zero (that is, if we received a pong for the previous ping).
*
* On error zero is returned, and we can't consider the PING command
* queued in the connection. */
int sentinelSendPing(sentinelRedisInstance *ri) {
int
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelPingReplyCallback
,
NULL
,
"PING"
);
int retval = redisAsyncCommand(ri->
link->
cc,
sentinelPingReplyCallback,
ri
, "PING");
if (retval == REDIS_OK) {
ri
->
pending_commands
++
;
/* We update the ping time only if we received the pong for
* the previous ping, otherwise we are technically waiting
* since the first ping that did not received a reply. */
if
(
ri
->
last_ping_time
==
0
)
ri
->
last_ping_time
=
mstime
();
ri->link->pending_commands++;
ri->link->last_ping_time = mstime();
/* We update the active ping time only if we received the pong for
* the previous ping, otherwise we are technically waiting since the
* first ping that did not received a reply. */
if (ri->link->act_ping_time == 0)
ri->link->act_ping_time = ri->link->last_ping_time;
return 1;
} else {
return 0;
...
...
@@ -2342,7 +2528,7 @@ void sentinelSendPeriodicCommands(sentinelRedisInstance *ri) {
/* Return ASAP if we have already a PING or INFO already pending, or
* in the case the instance is not properly connected. */
if
(
ri
->
flags
&
SRI_DISCONNECTED
)
return
;
if (ri->
link->disconnected
) return;
/* For INFO, PING, PUBLISH that are not critical commands to send we
* also have a limit of SENTINEL_MAX_PENDING_COMMANDS. We don't
...
...
@@ -2350,7 +2536,8 @@ void sentinelSendPeriodicCommands(sentinelRedisInstance *ri) {
* properly (note that anyway there is a redundant protection about this,
* that is, the link will be disconnected and reconnected if a long
* timeout condition is detected. */
if
(
ri
->
pending_commands
>=
SENTINEL_MAX_PENDING_COMMANDS
)
return
;
if (ri->link->pending_commands >=
SENTINEL_MAX_PENDING_COMMANDS * ri->link->refcount) return;
/* If this is a slave of a master in O_DOWN condition we start sending
* it INFO every second, instead of the usual SENTINEL_INFO_PERIOD
...
...
@@ -2374,10 +2561,11 @@ void sentinelSendPeriodicCommands(sentinelRedisInstance *ri) {
(now - ri->info_refresh) > info_period))
{
/* Send INFO to masters and slaves, not sentinels. */
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelInfoReplyCallback
,
NULL
,
"INFO"
);
if
(
retval
==
REDIS_OK
)
ri
->
pending_commands
++
;
}
else
if
((
now
-
ri
->
last_pong_time
)
>
ping_period
)
{
retval = redisAsyncCommand(ri->link->cc,
sentinelInfoReplyCallback, ri, "INFO");
if (retval == REDIS_OK) ri->link->pending_commands++;
} else if ((now - ri->link->last_pong_time) > ping_period &&
(now - ri->link->last_ping_time) > ping_period/2) {
/* Send PING to all the three kinds of instances. */
sentinelSendPing(ri);
} else if ((now - ri->last_pub_time) > SENTINEL_PUBLISH_PERIOD) {
...
...
@@ -2431,7 +2619,7 @@ void addReplySentinelRedisInstance(redisClient *c, sentinelRedisInstance *ri) {
if (ri->flags & SRI_MASTER) flags = sdscat(flags,"master,");
if (ri->flags & SRI_SLAVE) flags = sdscat(flags,"slave,");
if (ri->flags & SRI_SENTINEL) flags = sdscat(flags,"sentinel,");
if
(
ri
->
flags
&
SRI_DISCONNECTED
)
flags
=
sdscat
(
flags
,
"disconnected,"
);
if (ri->
link->disconnected
) flags = sdscat(flags,"disconnected,");
if (ri->flags & SRI_MASTER_DOWN) flags = sdscat(flags,"master_down,");
if (ri->flags & SRI_FAILOVER_IN_PROGRESS)
flags = sdscat(flags,"failover_in_progress,");
...
...
@@ -2445,8 +2633,12 @@ void addReplySentinelRedisInstance(redisClient *c, sentinelRedisInstance *ri) {
sdsfree(flags);
fields++;
addReplyBulkCString
(
c
,
"pending-commands"
);
addReplyBulkLongLong
(
c
,
ri
->
pending_commands
);
addReplyBulkCString(c,"link-pending-commands");
addReplyBulkLongLong(c,ri->link->pending_commands);
fields++;
addReplyBulkCString(c,"link-refcount");
addReplyBulkLongLong(c,ri->link->refcount);
fields++;
if (ri->flags & SRI_FAILOVER_IN_PROGRESS) {
...
...
@@ -2457,15 +2649,15 @@ void addReplySentinelRedisInstance(redisClient *c, sentinelRedisInstance *ri) {
addReplyBulkCString(c,"last-ping-sent");
addReplyBulkLongLong(c,
ri
->
l
as
t_ping_time
?
(
mstime
()
-
ri
->
l
as
t_ping_time
)
:
0
);
ri->l
ink->ac
t_ping_time ? (mstime() - ri->l
ink->ac
t_ping_time) : 0);
fields++;
addReplyBulkCString(c,"last-ok-ping-reply");
addReplyBulkLongLong
(
c
,
mstime
()
-
ri
->
last_avail_time
);
addReplyBulkLongLong(c,mstime() - ri->
link->
last_avail_time);
fields++;
addReplyBulkCString(c,"last-ping-reply");
addReplyBulkLongLong
(
c
,
mstime
()
-
ri
->
last_pong_time
);
addReplyBulkLongLong(c,mstime() - ri->
link->
last_pong_time);
fields++;
if (ri->flags & SRI_S_DOWN) {
...
...
@@ -2619,6 +2811,31 @@ sentinelRedisInstance *sentinelGetMasterByNameOrReplyError(redisClient *c,
return ri;
}
#define SENTINEL_ISQR_OK 0
#define SENTINEL_ISQR_NOQUORUM (1<<0)
#define SENTINEL_ISQR_NOAUTH (1<<1)
int sentinelIsQuorumReachable(sentinelRedisInstance *master, int *usableptr) {
dictIterator *di;
dictEntry *de;
int usable = 1; /* Number of usable Sentinels. Init to 1 to count myself. */
int result = SENTINEL_ISQR_OK;
int voters = dictSize(master->sentinels)+1; /* Known Sentinels + myself. */
di = dictGetIterator(master->sentinels);
while((de = dictNext(di)) != NULL) {
sentinelRedisInstance *ri = dictGetVal(de);
if (ri->flags & (SRI_S_DOWN|SRI_O_DOWN)) continue;
usable++;
}
dictReleaseIterator(di);
if (usable < (int)master->quorum) result |= SENTINEL_ISQR_NOQUORUM;
if (usable < voters/2+1) result |= SENTINEL_ISQR_NOAUTH;
if (usableptr) *usableptr = usable;
return result;
}
void sentinelCommand(redisClient *c) {
if (!strcasecmp(c->argv[1]->ptr,"masters")) {
/* SENTINEL MASTERS */
...
...
@@ -2649,7 +2866,23 @@ void sentinelCommand(redisClient *c) {
return;
addReplyDictOfRedisInstances(c,ri->sentinels);
} else if (!strcasecmp(c->argv[1]->ptr,"is-master-down-by-addr")) {
/* SENTINEL IS-MASTER-DOWN-BY-ADDR <ip> <port> <current-epoch> <runid>*/
/* SENTINEL IS-MASTER-DOWN-BY-ADDR <ip> <port> <current-epoch> <runid>
*
* Arguments:
*
* ip and port are the ip and port of the master we want to be
* checked by Sentinel. Note that the command will not check by
* name but just by master, in theory different Sentinels may monitor
* differnet masters with the same name.
*
* current-epoch is needed in order to understand if we are allowed
* to vote for a failover leader or not. Each Sentinel can vote just
* one time per epoch.
*
* runid is "*" if we are not seeking for a vote from the Sentinel
* in order to elect the failover leader. Otherwise it is set to the
* runid we want the Sentinel to vote if it did not already voted.
*/
sentinelRedisInstance *ri;
long long req_epoch;
uint64_t leader_epoch = 0;
...
...
@@ -2785,6 +3018,32 @@ void sentinelCommand(redisClient *c) {
dictDelete(sentinel.masters,c->argv[2]->ptr);
sentinelFlushConfig();
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"ckquorum")) {
/* SENTINEL CKQUORUM <name> */
sentinelRedisInstance *ri;
int usable;
if ((ri = sentinelGetMasterByNameOrReplyError(c,c->argv[2]))
== NULL) return;
int result = sentinelIsQuorumReachable(ri,&usable);
if (result == SENTINEL_ISQR_OK) {
addReplySds(c, sdscatfmt(sdsempty(),
"+OK %i usable Sentinels. Quorum and failover authorization "
"can be reached\r\n",usable));
} else {
sds e = sdscatfmt(sdsempty(),
"-NOQUORUM %i usable Sentinels. ",usable);
if (result & SENTINEL_ISQR_NOQUORUM)
e = sdscat(e,"Not enough available Sentinels to reach the"
" specified quorum for this master");
if (result & SENTINEL_ISQR_NOAUTH) {
if (result & SENTINEL_ISQR_NOQUORUM) e = sdscat(e,". ");
e = sdscat(e, "Not enough available Sentinels to reach the"
" majority and authorize a failover");
}
e = sdscat(e,"\r\n");
addReplySds(c,e);
}
} else if (!strcasecmp(c->argv[1]->ptr,"set")) {
if (c->argc < 3 || c->argc % 2 == 0) goto numargserr;
sentinelSetCommand(c);
...
...
@@ -3051,8 +3310,8 @@ void sentinelPublishCommand(redisClient *c) {
void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
mstime_t elapsed = 0;
if
(
ri
->
l
as
t_ping_time
)
elapsed
=
mstime
()
-
ri
->
l
as
t_ping_time
;
if (ri->l
ink->ac
t_ping_time)
elapsed = mstime() - ri->l
ink->ac
t_ping_time;
/* Check if we are in need for a reconnection of one of the
* links, because we are detecting low activity.
...
...
@@ -3060,15 +3319,16 @@ void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
* 1) Check if the command link seems connected, was connected not less
* than SENTINEL_MIN_LINK_RECONNECT_PERIOD, but still we have a
* pending ping for more than half the timeout. */
if
(
ri
->
cc
&&
(
mstime
()
-
ri
->
cc_conn_time
)
>
SENTINEL_MIN_LINK_RECONNECT_PERIOD
&&
ri
->
last_ping_time
!=
0
&&
/* Ther is a pending ping... */
if (ri->link->cc &&
(mstime() - ri->link->cc_conn_time) >
SENTINEL_MIN_LINK_RECONNECT_PERIOD &&
ri->link->act_ping_time != 0 && /* Ther is a pending ping... */
/* The pending ping is delayed, and we did not received
* error replies as well. */
(
mstime
()
-
ri
->
l
as
t_ping_time
)
>
(
ri
->
down_after_period
/
2
)
&&
(
mstime
()
-
ri
->
last_pong_time
)
>
(
ri
->
down_after_period
/
2
))
(mstime() - ri->l
ink->ac
t_ping_time) > (ri->down_after_period/2) &&
(mstime() - ri->
link->
last_pong_time) > (ri->down_after_period/2))
{
sentinelKillL
ink
(
ri
,
ri
->
cc
);
instanceLinkCloseConnection(ri->l
ink
,
ri
->link
->cc);
}
/* 2) Check if the pubsub link seems connected, was connected not less
...
...
@@ -3076,11 +3336,12 @@ void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
* activity in the Pub/Sub channel for more than
* SENTINEL_PUBLISH_PERIOD * 3.
*/
if
(
ri
->
pc
&&
(
mstime
()
-
ri
->
pc_conn_time
)
>
SENTINEL_MIN_LINK_RECONNECT_PERIOD
&&
(
mstime
()
-
ri
->
pc_last_activity
)
>
(
SENTINEL_PUBLISH_PERIOD
*
3
))
if (ri->link->pc &&
(mstime() - ri->link->pc_conn_time) >
SENTINEL_MIN_LINK_RECONNECT_PERIOD &&
(mstime() - ri->link->pc_last_activity) > (SENTINEL_PUBLISH_PERIOD*3))
{
sentinelKillL
ink
(
ri
,
ri
->
pc
);
instanceLinkCloseConnection(ri->l
ink
,
ri
->link
->pc);
}
/* Update the SDOWN flag. We believe the instance is SDOWN if:
...
...
@@ -3154,12 +3415,12 @@ void sentinelCheckObjectivelyDown(sentinelRedisInstance *master) {
/* Receive the SENTINEL is-master-down-by-addr reply, see the
* sentinelAskMasterStateToOtherSentinels() function for more information. */
void sentinelReceiveIsMasterDownReply(redisAsyncContext *c, void *reply, void *privdata) {
sentinelRedisInstance
*
ri
=
c
->
data
;
sentinelRedisInstance *ri = privdata;
instanceLink *link = c->data;
redisReply *r;
REDIS_NOTUSED
(
privdata
);
if
(
ri
)
ri
->
pending_commands
--
;
if
(
!
reply
||
!
ri
)
return
;
if (
!reply || !link) return
;
link->pending_commands--
;
r = reply;
/* Ignore every error or unexpected reply.
...
...
@@ -3220,21 +3481,21 @@ void sentinelAskMasterStateToOtherSentinels(sentinelRedisInstance *master, int f
* 2) Sentinel is connected.
* 3) We did not received the info within SENTINEL_ASK_PERIOD ms. */
if ((master->flags & SRI_S_DOWN) == 0) continue;
if
(
ri
->
flags
&
SRI_DISCONNECTED
)
continue
;
if (ri->
link->disconnected
) continue;
if (!(flags & SENTINEL_ASK_FORCED) &&
mstime() - ri->last_master_down_reply_time < SENTINEL_ASK_PERIOD)
continue;
/* Ask */
ll2string(port,sizeof(port),master->addr->port);
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelReceiveIsMasterDownReply
,
NULL
,
retval = redisAsyncCommand(ri->
link->
cc,
sentinelReceiveIsMasterDownReply,
ri
,
"SENTINEL is-master-down-by-addr %s %s %llu %s",
master->addr->ip, port,
sentinel.current_epoch,
(master->failover_state > SENTINEL_FAILOVER_STATE_NONE) ?
se
rver
.
run
id
:
"*"
);
if
(
retval
==
REDIS_OK
)
ri
->
pending_commands
++
;
se
ntinel.my
id : "*");
if (retval == REDIS_OK) ri->
link->
pending_commands++;
}
dictReleaseIterator(di);
}
...
...
@@ -3265,7 +3526,7 @@ char *sentinelVoteLeader(sentinelRedisInstance *master, uint64_t req_epoch, char
/* If we did not voted for ourselves, set the master failover start
* time to now, in order to force a delay before we can start a
* failover for the same master. */
if
(
strcasecmp
(
master
->
leader
,
se
rver
.
run
id
))
if (strcasecmp(master->leader,se
ntinel.my
id))
master->failover_start_time = mstime()+rand()%SENTINEL_MAX_DESYNC;
}
...
...
@@ -3346,7 +3607,7 @@ char *sentinelGetLeader(sentinelRedisInstance *master, uint64_t epoch) {
if (winner)
myvote = sentinelVoteLeader(master,epoch,winner,&leader_epoch);
else
myvote
=
sentinelVoteLeader
(
master
,
epoch
,
se
rver
.
run
id
,
&
leader_epoch
);
myvote = sentinelVoteLeader(master,epoch,se
ntinel.my
id,&leader_epoch);
if (myvote && leader_epoch == epoch) {
uint64_t votes = sentinelLeaderIncr(counters,myvote);
...
...
@@ -3400,35 +3661,35 @@ int sentinelSendSlaveOf(sentinelRedisInstance *ri, char *host, int port) {
*
* Note that we don't check the replies returned by commands, since we
* will observe instead the effects in the next INFO output. */
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
"MULTI"
);
retval = redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
, "MULTI");
if (retval == REDIS_ERR) return retval;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
"SLAVEOF %s %s"
,
host
,
portstr
);
retval = redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
, "SLAVEOF %s %s", host, portstr);
if (retval == REDIS_ERR) return retval;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
"CONFIG REWRITE"
);
retval = redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
, "CONFIG REWRITE");
if (retval == REDIS_ERR) return retval;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
/* CLIENT KILL TYPE <type> is only supported starting from Redis 2.8.12,
* however sending it to an instance not understanding this command is not
* an issue because CLIENT is variadic command, so Redis will not
* recognized as a syntax error, and the transaction will not fail (but
* only the unsupported command will fail). */
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
"CLIENT KILL TYPE normal"
);
retval = redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
, "CLIENT KILL TYPE normal");
if (retval == REDIS_ERR) return retval;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
retval
=
redisAsyncCommand
(
ri
->
cc
,
sentinelDiscardReplyCallback
,
NULL
,
"EXEC"
);
retval = redisAsyncCommand(ri->
link->
cc,
sentinelDiscardReplyCallback,
ri
, "EXEC");
if (retval == REDIS_ERR) return retval;
ri
->
pending_commands
++
;
ri->
link->
pending_commands++;
return REDIS_OK;
}
...
...
@@ -3566,8 +3827,9 @@ sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master) {
sentinelRedisInstance *slave = dictGetVal(de);
mstime_t info_validity_time;
if
(
slave
->
flags
&
(
SRI_S_DOWN
|
SRI_O_DOWN
|
SRI_DISCONNECTED
))
continue
;
if
(
mstime
()
-
slave
->
last_avail_time
>
SENTINEL_PING_PERIOD
*
5
)
continue
;
if (slave->flags & (SRI_S_DOWN|SRI_O_DOWN)) continue;
if (slave->link->disconnected) continue;
if (mstime() - slave->link->last_avail_time > SENTINEL_PING_PERIOD*5) continue;
if (slave->slave_priority == 0) continue;
/* If the master is in SDOWN state we get INFO for slaves every second.
...
...
@@ -3598,7 +3860,7 @@ void sentinelFailoverWaitStart(sentinelRedisInstance *ri) {
/* Check if we are the leader for the failover epoch. */
leader = sentinelGetLeader(ri, ri->failover_epoch);
isleader
=
leader
&&
strcasecmp
(
leader
,
se
rver
.
run
id
)
==
0
;
isleader = leader && strcasecmp(leader,se
ntinel.my
id) == 0;
sdsfree(leader);
/* If I'm not the leader, and it is not a forced failover via
...
...
@@ -3648,7 +3910,7 @@ void sentinelFailoverSendSlaveOfNoOne(sentinelRedisInstance *ri) {
/* We can't send the command to the promoted slave if it is now
* disconnected. Retry again and again with this state until the timeout
* is reached, then abort the failover. */
if
(
ri
->
promoted_slave
->
flags
&
SRI_DISCONNECTED
)
{
if (ri->
link->disconnected
) {
if (mstime() - ri->failover_state_change_time > ri->failover_timeout) {
sentinelEvent(REDIS_WARNING,"-failover-abort-slave-timeout",ri,"%@");
sentinelAbortFailover(ri);
...
...
@@ -3727,8 +3989,8 @@ void sentinelFailoverDetectEnd(sentinelRedisInstance *master) {
sentinelRedisInstance *slave = dictGetVal(de);
int retval;
if
(
slave
->
flags
&
(
SRI_RECONF_DONE
|
SRI_RECONF_SENT
|
SRI_DISCONNECTED
)
)
continue
;
if (slave->flags &
(SRI_RECONF_DONE|SRI_RECONF_SENT)) continue;
if (slave->link->disconnected
) continue;
retval = sentinelSendSlaveOf(slave,
master->promoted_slave->addr->ip,
...
...
@@ -3783,8 +4045,8 @@ void sentinelFailoverReconfNextSlave(sentinelRedisInstance *master) {
/* Nothing to do for instances that are disconnected or already
* in RECONF_SENT state. */
if
(
slave
->
flags
&
(
SRI_
DISCONNECTED
|
SRI_
RECONF_SENT
|
SRI_RECONF_INPROG
))
continue
;
if (slave->flags & (SRI_RECONF_SENT|SRI_RECONF_INPROG))
continue;
if (slave->link->disconnected)
continue;
/* Send SLAVEOF <new master>. */
retval = sentinelSendSlaveOf(slave,
...
...
tests/sentinel/tests/06-ckquorum.tcl
0 → 100644
View file @
164b6bba
# Test for the SENTINEL CKQUORUM command
source
"../tests/includes/init-tests.tcl"
set num_sentinels
[
llength $::sentinel_instances
]
test
"CKQUORUM reports OK and the right amount of Sentinels"
{
foreach_sentinel_id id
{
assert_match
"*OK
$num
_sentinels usable*"
[
S $id SENTINEL CKQUORUM mymaster
]
}
}
test
"CKQUORUM detects quorum cannot be reached"
{
set orig_quorum
[
expr
{
$num
_sentinels/2+1
}]
S 0 SENTINEL SET mymaster quorum
[
expr
{
$num
_sentinels+1
}]
catch
{[
S 0 SENTINEL CKQUORUM mymaster
]}
err
assert_match
"*NOQUORUM*"
$err
S 0 SENTINEL SET mymaster quorum $orig_quorum
}
test
"CKQUORUM detects failover authorization cannot be reached"
{
set orig_quorum
[
expr
{
$num
_sentinels/2+1
}]
S 0 SENTINEL SET mymaster quorum 1
kill_instance sentinel 1
kill_instance sentinel 2
kill_instance sentinel 3
after 5000
catch
{[
S 0 SENTINEL CKQUORUM mymaster
]}
err
assert_match
"*NOQUORUM*"
$err
S 0 SENTINEL SET mymaster quorum $orig_quorum
restart_instance sentinel 1
restart_instance sentinel 2
restart_instance sentinel 3
}
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