void replicationCron(void) {
/* Bulk transfer I/O timeout? */
if (server.masterhost && server.replstate == REDIS_REPL_TRANSFER &&
(time(NULL)-server.repl_transfer_lastio) > REDIS_REPL_TIMEOUT)
{
redisLog(REDIS_WARNING,"Timeout receiving bulk data from MASTER...");
replicationAbortSyncTransfer();
}
/* Timed out master when we are an already connected slave? */
if (server.masterhost && server.replstate == REDIS_REPL_CONNECTED &&
(time(NULL)-server.master->lastinteraction) > REDIS_REPL_TIMEOUT)
{
redisLog(REDIS_WARNING,"MASTER time out: no data nor PING received...");
freeClient(server.master);
}
/* Check if we should connect to a MASTER */
if (server.replstate == REDIS_REPL_CONNECT) {
redisLog(REDIS_NOTICE,"Connecting to MASTER...");
if (syncWithMaster() == REDIS_OK) {
redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync started: SYNC sent");
if (server.appendonly) rewriteAppendOnlyFileBackground();
}
}
/* If we have attached slaves, PING them from time to time.
* So slaves can implement an explicit timeout to masters, and will
* be able to detect a link disconnection even if the TCP connection
* will not actually go down. */
if (!(server.cronloops % (REDIS_REPL_PING_SLAVE_PERIOD*10))) {
listIter li;
listNode *ln;
listRewind(server.slaves,&li);
while((ln = listNext(&li))) {
redisClient *slave = ln->value;
/* Don't ping slaves that are in the middle of a bulk transfer
* with the master for first synchronization. */
if (slave->replstate == REDIS_REPL_SEND_BULK) continue;
if (slave->replstate == REDIS_REPL_ONLINE) {
/* If the slave is online send a normal ping */
addReplySds(slave,sdsnew("PING\r\n"));
} else {
/* Otherwise we are in the pre-synchronization stage.
* Just a newline will do the work of refreshing the
* connection last interaction time, and at the same time
* we'll be sure that being a single char there are no
* short-write problems. */
write(slave->fd, "\n", 1);
}
}
}
}
void bgrewriteaofCommand(redisClient *c) {
if (server.bgrewritechildpid != -1) {
addReplyError(c,"Background append only file rewriting already in progress");
return;
}
if (rewriteAppendOnlyFileBackground() == REDIS_OK) {
addReplyStatus(c,"Background append only file rewriting started");
} else {
addReply(c,shared.err);
}
}
void bgrewriteaofCommand(redisClient *c) {
if (server.aof_child_pid != -1) {
addReplyError(c,"Background append only file rewriting already in progress");
} else if (server.rdb_child_pid != -1) {
server.aof_rewrite_scheduled = 1;
addReplyStatus(c,"Background append only file rewriting scheduled");
} else if (rewriteAppendOnlyFileBackground() == REDIS_OK) {
addReplyStatus(c,"Background append only file rewriting started");
} else {
addReply(c,shared.err);
}
}
static void bgrewriteaofCommand(redisClient *c) {
if (server.bgrewritechildpid != -1) {
addReplySds(c,sdsnew("-ERR background append only file rewriting already in progress\r\n"));
return;
}
if (rewriteAppendOnlyFileBackground() == REDIS_OK) {
char *status = "+Background append only file rewriting started\r\n";
addReplySds(c,sdsnew(status));
} else {
addReply(c,shared.err);
}
}
/* Called when the user switches from "appendonly no" to "appendonly yes"
* at runtime using the CONFIG command. */
int startAppendOnly(void) {
server.appendonly = 1;
server.lastfsync = time(NULL);
server.appendfd = open(server.appendfilename,O_WRONLY|O_APPEND|O_CREAT,0644);
if (server.appendfd == -1) {
redisLog(REDIS_WARNING,"Used tried to switch on AOF via CONFIG, but I can't open the AOF file: %s",strerror(errno));
return REDIS_ERR;
}
if (rewriteAppendOnlyFileBackground() == REDIS_ERR) {
server.appendonly = 0;
close(server.appendfd);
redisLog(REDIS_WARNING,"Used tried to switch on AOF via CONFIG, I can't trigger a background AOF rewrite operation. Check the above logs for more info about the error.",strerror(errno));
return REDIS_ERR;
}
return REDIS_OK;
}
/* Called when the user switches from "appendonly no" to "appendonly yes"
* at runtime using the CONFIG command. */
int startAppendOnly(void) {
server.aof_last_fsync = server.unixtime;
server.aof_fd = open(server.aof_filename,O_WRONLY|O_APPEND|O_CREAT,0644);
redisAssert(server.aof_state == REDIS_AOF_OFF);
if (server.aof_fd == -1) {
redisLog(REDIS_WARNING,"Redis needs to enable the AOF but can't open the append only file: %s",strerror(errno));
return REDIS_ERR;
}
if (rewriteAppendOnlyFileBackground() == REDIS_ERR) {
close(server.aof_fd);
redisLog(REDIS_WARNING,"Redis needs to enable the AOF but can't trigger a background AOF rewrite operation. Check the above logs for more info about the error.");
return REDIS_ERR;
}
/* We correctly switched on AOF, now wait for the rerwite to be complete
* in order to append data on disk. */
server.aof_state = REDIS_AOF_WAIT_REWRITE;
return REDIS_OK;
}
int startAppendOnly(void){
/*Called when the user switches from "appendonly no" to "appendonly yes", at runtime using the CONFIG command.*/
server.aof_last_fsync = server.unixtime;
/*Open AOF file*/
if((server.aof_fd = open(server.aof_filename, O_WRONLY|O_APPEND|O_CREAT, 0644)) == -1){
xredisLog(XREDIS_WARNING, "xredis needs to enable the AOF but can't open the append only file: %s",strerror(errno));
return XREDIS_ERR;
}
xredisAssert(server.aof_state == XREDIS_AOF_OFF);
/*start aof Background rewrite*/
if(rewriteAppendOnlyFileBackground() == XREDIS_ERR){
close(server.aof_fd);
xredisLog(XREDIS_WARNING,"Xredis needs to enable the AOF but can't trigger a background AOF rewrite operation. Check the above logs for more info about the error.");
return XREDIS_ERR;
}
/*set AOF state as WAIT_REWRITE*/
server.aof_state = XREDIS_AOF_WAIT_REWRITE;
return XREDIS_OK;
}