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Do not install a file event to send data to rewrite child when parent stop sending diff to child in aof rewrite. (#8767)

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In aof rewrite, when parent stop sending data to child, if there is
new rewrite data, aofChildWriteDiffData write event will be installed.
Then this event is issued and deletes the file event without do anyting.
This will happen over and over again until aof rewrite finish.

This bug used to waste a few system calls per excessive wake-up
(epoll_ctl and epoll_wait) per cycle, each cycle triggered by receiving
a write command from a client.
This commit is contained in:
Huang Zhw 2021-07-11 18:00:17 +08:00 committed by GitHub
parent fe5d325107
commit cb961d8c8e
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1 changed files with 3 additions and 1 deletions
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src/aof.c
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@ -187,7 +187,9 @@ void aofRewriteBufferAppend(unsigned char *s, unsigned long len) {
/* Install a file event to send data to the rewrite child if there is
* not one already. */
if (aeGetFileEvents(server.el,server.aof_pipe_write_data_to_child) == 0) {
if (!server.aof_stop_sending_diff &&
aeGetFileEvents(server.el,server.aof_pipe_write_data_to_child) == 0)
{
aeCreateFileEvent(server.el, server.aof_pipe_write_data_to_child,
AE_WRITABLE, aofChildWriteDiffData, NULL);
}