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Child -> Parent pipe for COW info transferring.

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This commit is contained in:
antirez
2016-09-19 13:45:20 +02:00
parent e1eccf9a6b
commit e565632e59
6 changed files with 132 additions and 3 deletions
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10
src/rdb.c
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@ -1014,6 +1014,7 @@ int rdbSaveBackground(char *filename) {
server.dirty_before_bgsave = server.dirty;
server.lastbgsave_try = time(NULL);
openChildInfoPipe();
start = ustime();
if ((childpid = fork()) == 0) {
@ -1031,6 +1032,9 @@ int rdbSaveBackground(char *filename) {
"RDB: %zu MB of memory used by copy-on-write",
private_dirty/(1024*1024));
}
server.child_info_data.cow_size = private_dirty;
sendChildInfo(CHILD_INFO_TYPE_RDB);
}
exitFromChild((retval == C_OK) ? 0 : 1);
} else {
@ -1039,6 +1043,7 @@ int rdbSaveBackground(char *filename) {
server.stat_fork_rate = (double) zmalloc_used_memory() * 1000000 / server.stat_fork_time / (1024*1024*1024); /* GB per second. */
latencyAddSampleIfNeeded("fork",server.stat_fork_time/1000);
if (childpid == -1) {
closeChildInfoPipe();
server.lastbgsave_status = C_ERR;
serverLog(LL_WARNING,"Can't save in background: fork: %s",
strerror(errno));
@ -1744,6 +1749,7 @@ int rdbSaveToSlavesSockets(void) {
}
/* Create the child process. */
openChildInfoPipe();
start = ustime();
if ((childpid = fork()) == 0) {
/* Child */
@ -1769,6 +1775,9 @@ int rdbSaveToSlavesSockets(void) {
private_dirty/(1024*1024));
}
server.child_info_data.cow_size = private_dirty;
sendChildInfo(CHILD_INFO_TYPE_RDB);
/* If we are returning OK, at least one slave was served
* with the RDB file as expected, so we need to send a report
* to the parent via the pipe. The format of the message is:
@ -1837,6 +1846,7 @@ int rdbSaveToSlavesSockets(void) {
}
close(pipefds[0]);
close(pipefds[1]);
closeChildInfoPipe();
} else {
serverLog(LL_NOTICE,"Background RDB transfer started by pid %d",
childpid);