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Scripting: single commands replication mode implemented.

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By calling redis.replicate_commands(), the scripting engine of Redis
switches to commands replication instead of replicating whole scripts.
This is useful when the script execution is costly but only results in a
few writes performed to the dataset.

Morover, in this mode, it is possible to call functions with side
effects freely, since the script execution does not need to be
deterministic: anyway we'll capture the outcome from the point of view
of changes to the dataset.

In this mode math.random() returns different sequences at every call.

If redis.replicate_commnads() is not called before any other write, the
command returns false and sticks to whole scripts replication instead.
This commit is contained in:
antirez
2015-10-29 12:39:07 +01:00
parent cdda6748c2
commit fc38235664
3 changed files with 72 additions and 8 deletions
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5
src/server.h
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@ -747,7 +747,7 @@ struct redisServer {
off_t loading_process_events_interval_bytes;
/* Fast pointers to often looked up command */
struct redisCommand *delCommand, *multiCommand, *lpushCommand, *lpopCommand,
*rpopCommand, *sremCommand;
*rpopCommand, *sremCommand, *execCommand;
/* Fields used only for stats */
time_t stat_starttime; /* Server start time */
long long stat_numcommands; /* Number of processed commands */
@ -952,6 +952,8 @@ struct redisServer {
execution of the current script. */
int lua_random_dirty; /* True if a random command was called during the
execution of the current script. */
int lua_replicate_commands; /* True if we are doing single commands repl. */
int lua_multi_emitted;/* True if we already proagated MULTI. */
int lua_timedout; /* True if we reached the time limit for script
execution. */
int lua_kill; /* Kill the script if true. */
@ -1173,6 +1175,7 @@ void touchWatchedKey(redisDb *db, robj *key);
void touchWatchedKeysOnFlush(int dbid);
void discardTransaction(client *c);
void flagTransaction(client *c);
void execCommandPropagateMulti(client *c);
/* Redis object implementation */
void decrRefCount(robj *o);