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ruanhaishen
redis
Commits
ad01a255
Commit
ad01a255
authored
Dec 31, 2010
by
antirez
Browse files
blocking load of keys on lookup -- nor tested, nor finished
parent
4e941eca
Changes
2
Show whitespace changes
Inline
Side-by-side
src/db.c
View file @
ad01a255
...
...
@@ -27,10 +27,26 @@ robj *lookupKey(redisDb *db, robj *key) {
server
.
stat_keyspace_hits
++
;
return
val
;
}
else
{
/* FIXME: Check if the object is on disk, if it is, load it
* in a blocking way now. If we are sure there are no collisions
* it would be cool to load this directly here without IO thread
* help. */
time_t
expire
;
robj
*
val
;
/* Key not found in the in memory hash table, but if disk store is
* enabled we may have this key on disk. If so load it in memory
* in a blocking way.
*
* FIXME: race condition here. If there was an already scheduled
* async loading of this key, what may happen is that the old
* key is loaded in memory if this gets deleted in the meantime. */
if
(
server
.
ds_enabled
&&
cacheKeyMayExist
(
db
,
key
))
{
val
=
dsGet
(
db
,
key
,
&
expire
);
if
(
val
)
{
int
retval
=
dbAdd
(
db
,
key
,
val
);
redisAssert
(
retval
==
REDIS_OK
);
if
(
expire
!=
-
1
)
setExpire
(
db
,
key
,
expire
);
server
.
stat_keyspace_hits
++
;
return
val
;
}
}
server
.
stat_keyspace_misses
++
;
return
NULL
;
}
...
...
src/dscache.c
View file @
ad01a255
...
...
@@ -292,9 +292,13 @@ void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata,
if
(
j
->
type
==
REDIS_IOJOB_LOAD
)
{
/* Create the key-value pair in the in-memory database */
if
(
j
->
val
!=
NULL
)
{
dbAdd
(
j
->
db
,
j
->
key
,
j
->
val
);
/* Note: the key may already be here if between the time
* this key loading was scheduled and now there was the
* need to blocking load the key for a key lookup. */
if
(
dbAdd
(
j
->
db
,
j
->
key
,
j
->
val
)
==
REDIS_OK
)
{
incrRefCount
(
j
->
val
);
if
(
j
->
expire
!=
-
1
)
setExpire
(
j
->
db
,
j
->
key
,
j
->
expire
);
}
}
else
{
/* The key does not exist. Create a negative cache entry
* for this key. */
...
...
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