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Cluster: new clusterDoBeforeSleep() API.

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The new API is able to remember operations to perform before returning
to the event loop, such as checking if there is the failover quorum for
a slave, save and fsync the configuraiton file, and so forth.

Because this operations are performed before returning on the event
loop we are sure that messages that are sent in the same event loop run
will be delivered *after* the configuration is already saved, that is a
requirement sometimes. For instance we want to publish a new epoch only
when it is already stored in nodes.conf in order to avoid returning back
in the logical clock when a node is restarted.

This new API provides a big performance advantage compared to saving and
possibly fsyncing the configuration file multiple times in the same
event loop run, especially in the case of big clusters with tens or
hundreds of nodes.
This commit is contained in:
antirez
2013-10-03 09:55:20 +02:00
parent 211dcbe339
commit 7afc0dd59a
2 changed files with 72 additions and 63 deletions
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8
src/redis.h
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@ -653,11 +653,17 @@ typedef struct {
uint64_t failover_auth_epoch; /* Epoch of the current election. */
/* The followign fields are uesd by masters to take state on elections. */
uint64_t last_vote_epoch; /* Epoch of the last vote granted. */
int handle_slave_failover_asap; /* Call clusterHandleSlaveFailover() ASAP. */
int todo_before_sleep; /* Things to do in clusterBeforeSleep(). */
long long stats_bus_messages_sent; /* Num of msg sent via cluster bus. */
long long stats_bus_messages_received; /* Num of msg received via cluster bus. */
} clusterState;
/* clusterState todo_before_sleep flags. */
#define CLUSTER_TODO_HANDLE_FAILOVER (1<<0)
#define CLUSTER_TODO_UPDATE_STATE (1<<1)
#define CLUSTER_TODO_SAVE_CONFIG (1<<2)
#define CLUSTER_TODO_FSYNC_CONFIG (1<<3)
/* Redis cluster messages header */
/* Note that the PING, PONG and MEET messages are actually the same exact