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Check for EAGAIN in sendBulkToSlave().

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Sometime an osx master with a Linux server over a slow link caused
a strange error where osx called the writable function for
the socket but actually apparently there was no room in the socket
buffer to accept the write: write(2) call returned an EAGAIN error,
that was not checked, so we considered write(2) == 0 always as a connection
reset, which was unfortunate since the bulk transfer has to start again.

Also more errors are logged with the WARNING level in the same code path
now.
This commit is contained in:
antirez 2014-02-05 16:38:10 +01:00
parent 04fe000bf8
commit 970de3e9c0
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/replication.c
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@ -613,9 +613,11 @@ void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) {
return;
}
if ((nwritten = write(fd,buf,buflen)) == -1) {
redisLog(REDIS_VERBOSE,"Write error sending DB to slave: %s",
strerror(errno));
freeClient(slave);
if (errno != EAGAIN) {
redisLog(REDIS_WARNING,"Write error sending DB to slave: %s",
strerror(errno));
freeClient(slave);
}
return;
}
slave->repldboff += nwritten;
@ -627,6 +629,7 @@ void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) {
slave->repl_ack_time = server.unixtime;
if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE,
sendReplyToClient, slave) == AE_ERR) {
redisLog(REDIS_WARNING,"Unable to register writable event for slave bulk transfer: %s", strerror(errno));
freeClient(slave);
return;
}