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min-slaves-to-write: don't accept writes with less than N replicas.

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This feature allows the user to specify the minimum number of
connected replicas having a lag less or equal than the specified
amount of seconds for writes to be accepted.
This commit is contained in:
antirez
2013-05-29 11:36:44 +02:00
parent fc2587ec6e
commit d0d67f8d42
6 changed files with 77 additions and 2 deletions
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8
src/redis.h
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@ -118,6 +118,8 @@
#define REDIS_DEFAULT_AOF_NO_FSYNC_ON_REWRITE 0
#define REDIS_DEFAULT_ACTIVE_REHASHING 1
#define REDIS_DEFAULT_AOF_REWRITE_INCREMENTAL_FSYNC 1
#define REDIS_DEFAULT_MIN_SLAVES_TO_WRITE 0
#define REDIS_DEFAULT_MIN_SLAVES_MAX_LAG 10
/* Protocol and I/O related defines */
#define REDIS_MAX_QUERYBUF_LEN (1024*1024*1024) /* 1GB max query buffer. */
@ -479,7 +481,7 @@ struct sharedObjectsStruct {
*colon, *nullbulk, *nullmultibulk, *queued,
*emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
*outofrangeerr, *noscripterr, *loadingerr, *slowscripterr, *bgsaveerr,
*masterdownerr, *roslaveerr, *execaborterr, *noautherr,
*masterdownerr, *roslaveerr, *execaborterr, *noautherr, *noreplicaserr,
*oomerr, *plus, *messagebulk, *pmessagebulk, *subscribebulk,
*unsubscribebulk, *psubscribebulk, *punsubscribebulk, *del, *rpop, *lpop,
*lpush,
@ -676,6 +678,9 @@ struct redisServer {
gets released. */
time_t repl_no_slaves_since; /* We have no slaves since that time.
Only valid if server.slaves len is 0. */
int repl_min_slaves_to_write; /* Min number of slaves to write. */
int repl_min_slaves_max_lag; /* Max lag of <count> slaves to write. */
int repl_good_slaves_count; /* Number of slaves with lag <= max_lag. */
/* Replication (slave) */
char *masterauth; /* AUTH with this password with master */
char *masterhost; /* Hostname of master */
@ -986,6 +991,7 @@ void replicationCron(void);
void replicationHandleMasterDisconnection(void);
void replicationCacheMaster(redisClient *c);
void resizeReplicationBacklog(long long newsize);
void refreshGoodSlavesCount(void);
/* Generic persistence functions */
void startLoading(FILE *fp);