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syncCommand() comments improved.

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This commit is contained in:
antirez 2015-08-05 08:41:57 +02:00
parent 292fec058a
commit 62b5c60ead
1 changed files with 8 additions and 1 deletions
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9
src/replication.c
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@ -544,6 +544,8 @@ void syncCommand(client *c) {
/* Here we need to check if there is a background saving operation
* in progress, or if it is required to start one */
/* CASE 1: BGSAVE is in progress and replication target is disk. */
if (server.rdb_child_pid != -1 &&
server.rdb_child_type == RDB_CHILD_TYPE_DISK)
{
@ -572,6 +574,8 @@ void syncCommand(client *c) {
c->replstate = SLAVE_STATE_WAIT_BGSAVE_START;
serverLog(LL_NOTICE,"Waiting for next BGSAVE for SYNC");
}
/* CASE 2: BGSAVE is in progress and replication target is socket. */
} else if (server.rdb_child_pid != -1 &&
server.rdb_child_type == RDB_CHILD_TYPE_SOCKET)
{
@ -580,6 +584,8 @@ void syncCommand(client *c) {
* in order to synchronize. */
c->replstate = SLAVE_STATE_WAIT_BGSAVE_START;
serverLog(LL_NOTICE,"Waiting for next BGSAVE for SYNC");
/* CASE 3: There is no BGSAVE is progress. */
} else {
if (server.repl_diskless_sync) {
/* Diskless replication RDB child is created inside
@ -589,7 +595,8 @@ void syncCommand(client *c) {
if (server.repl_diskless_sync_delay)
serverLog(LL_NOTICE,"Delay next BGSAVE for SYNC");
} else {
/* Ok we don't have a BGSAVE in progress, let's start one. */
/* Target is disk and we don't have a BGSAVE in progress,
* let's start one. */
if (startBgsaveForReplication() != C_OK) {
serverLog(LL_NOTICE,"Replication failed, can't BGSAVE");
addReplyError(c,"Unable to perform background save");