- 20 Mar, 2014 2 commits
- 19 Mar, 2014 1 commit
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antirez authored
Now CONFIG RESETSTAT makes sure to reset all the fields, and in the future it will be simpler to avoid missing new fields.
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- 18 Mar, 2014 6 commits
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antirez authored
Test sentinel.tilt condition on top and return if it is true. This allows to remove the check for the tilt condition in the remaining code paths of the function.
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antirez authored
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antirez authored
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antirez authored
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antirez authored
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antirez authored
addReplySentinelRedisInstance() modified so that this field is displayed for all the kind of instances: Sentinels, Masters, Slaves.
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- 17 Mar, 2014 1 commit
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antirez authored
Failure detection in Sentinel is ping-pong based. It used to work by remembering the last time a valid PONG reply was received, and checking if the reception time was too old compared to the current current time. PINGs were sent at a fixed interval of 1 second. This works in a decent way, but does not scale well when we want to set very small values of "down-after-milliseconds" (this is the node timeout basically). This commit reiplements the failure detection making a number of changes. Some changes are inspired to Redis Cluster failure detection code: * A new last_ping_time field is added in representation of instances. If non zero, we have an active ping that was sent at the specified time. When a valid reply to ping is received, the field is zeroed again. * last_ping_time is not reset when we reconnect the link or send a new ping, so from our point of view it represents the time we started waiting for the instance to reply to our pings without receiving a reply. * last_ping_time is now used in order to check if the instance is timed out. This means that we can have a node timeout of 100 milliseconds and yet the system will work well since the new check is not bound to the period used to send pings. * Pings are now sent every second, or often if the value of down-after-milliseconds is less than one second. With a lower limit of 10 HZ ping frequency. * Link reconnection code was improved. This is used in order to try to reconnect the link when we are at 50% of the node timeout without a valid reply received yet. However the old code triggered unnecessary reconnections when the node timeout was very small. Now that should be ok. The new code passes the tests but more testing is needed and more unit tests stressing the failure detector, so currently this is merged only in the unstable branch.
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- 15 Mar, 2014 1 commit
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antirez authored
This makes debugging / monitoring of Sentinels simpler since you can identify sentinels in CLIENT LIST output of Redis instances.
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- 14 Mar, 2014 5 commits
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Salvatore Sanfilippo authored
Fix segfault from accessing array out of bounds
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Matt Stancliff authored
argc == 2; argv[2] == crash
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antirez authored
Sentinel's main safety argument is that there are no two configurations for the same master with the same version (configuration epoch). For this to be true Sentinels require to be authorized by a majority. Additionally Sentinels require to do two important things: * Never vote again for the same epoch. * Never exchange an old vote for a fresh one. The first prerequisite, in a crash-recovery system model, requires to persist the master->leader_epoch on durable storage before to reply to messages. This was not the case. We also make sure to persist the current epoch in order to never reply to stale votes requests from other Sentinels, after a recovery. The configuration is persisted by making use of fsync(), this is considered in the context of this code a good enough guarantee that after a restart our durable state is restored, however this may not always be the case depending on the kind of hardware and operating system used.
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antirez authored
Now the way HELLO messages are received is unified. Now it is no longer needed for Sentinels to converge to the higher configuration for a master to be able to chat via some Redis instance, the are able to directly exchanges configurations. Note that this commit does not include the (trivial) change needed to send HELLO messages to Sentinel instances as well, since for an error I committed the change in the previous commit that refactored hello messages processing into a separated function.
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antirez authored
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- 13 Mar, 2014 2 commits
- 11 Mar, 2014 8 commits
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antirez authored
See issue #1593. Thanks to @badboy for suggesting the direct client.call fix.
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antirez authored
Example: ./redis-trib.rb call 192.168.1.11:7000 config get cluster-node-timeout
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antirez authored
Example: if the user will try to configure a cluster with 9 nodes, asking for 1 slave for master, redis-trib will configure a 4 masters cluster with 1 slave each as usually, but this time will assign the spare node as a slave of one of the masters.
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antirez authored
The UPDATE message contains the configEpoch of the node configuration advertised in the packet. Update it if needed.
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antirez authored
By manually modifying nodes configurations in random ways, it is possible to create the following scenario: A is serving keys for slot 10 B is manually configured to serve keys for slot 10 A receives an update from B (or another node) where it is informed that the slot 10 is now claimed by B with a greater configuration epoch, however A still has keys from slot 10. With this commit A will put the slot in error setting it in IMPORTING state, so that redis-trib can detect the issue.
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antirez authored
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antirez authored
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antirez authored
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- 10 Mar, 2014 14 commits
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antirez authored
The new "error" subcommand of the DEBUG command can reply with an user selected error, specified as its sole argument: DEBUG ERROR "LOADING please wait..." The error is generated just prefixing the command argument with a "-" character, and replacing newlines with spaces (since error replies can't include newlines). The goal of the command is to help in Client libraries unit tests by making simple to simulate a command call triggering a given error.
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antirez authored
getKeysFromCommand() is designed to be called with the command arguments passing the basic arity checks described in the command table. DEBUG CMDKEYS must provide the same guarantees for calling getKeysFromCommand() to be safe.
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antirez authored
It does not make sense to pass multiple store options, so, better to handle it ;-)
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antirez authored
Examples: redis 127.0.0.1:6379> debug cmdkeys set foo bar 1) "foo" redis 127.0.0.1:6379> debug cmdkeys mget a b c 1) "a" 2) "b" 3) "c" redis 127.0.0.1:6379> debug cmdkeys zunionstore foo 2 a b 1) "a" 2) "b" 3) "foo" redis 127.0.0.1:6379> debug cmdkeys ping (empty list or set)
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antirez authored
There is the exception of a "constant" BY pattern that is used in order to signal to don't sort at all. In this case no lookup is needed so it is possible to support this case in Cluster mode.
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antirez authored
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antirez authored
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antirez authored
The commit also refactors a bit the error handling during SORT option parsing.
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antirez authored
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antirez authored
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antirez authored
Previously we used zunionInterGetKeys(), however after this function was fixed to account for the destination key (not needed when the API was designed for "diskstore") the two set of commands can no longer be served by an unique keys-extraction function.
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antirez authored
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antirez authored
This API originated from the "diskstore" experiment, not for Redis Cluster itself, so there were legacy/useless things trying to differentiate between keys that are going to be overwritten and keys that need to be fetched from disk (preloaded). All useless with Cluster, so removed with the result of code simplification.
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antirez authored
Everything was pretty clear again from the initial statements.
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