fluencelabs/redis
1
0
Fork 0
mirror of https://github.com/fluencelabs/redis synced 2025-04-25 10:32:14 +00:00
Code Issues Projects Releases Wiki Activity

MIGRATE: retry one time on I/O error.

Browse Source 
Now that we cache connections, a retry attempt makes sure that the
operation don't fail just because there is an existing connection error
on the socket, like the other end closing the connection.

Unfortunately this condition is not detectable using
getsockopt(SO_ERROR), so the only option left is to retry.

We don't retry on timeouts.
This commit is contained in:
antirez 2012-11-14 11:30:24 +01:00
parent 17411f7afd
commit 2feef47aa1
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/cluster.c
View File

@ -1741,12 +1741,19 @@ void migrateCloseTimedoutSockets(void) {
/* MIGRATE host port key dbid timeout [COPY | REPLACE] */
void migrateCommand(redisClient *c) {
int fd, copy = 0, replace = 0, j;
int fd, copy, replace, j;
long timeout;
long dbid;
long long ttl = 0, expireat;
long long ttl, expireat;
robj *o;
rio cmd, payload;
int retry_num = 0;
try_again:
/* Initialization */
copy = 0;
replace = 0;
ttl = 0;
/* Parse additional options */
for (j = 6; j < c->argc; j++) {
@ -1809,6 +1816,7 @@ void migrateCommand(redisClient *c) {
redisAssertWithInfo(c,NULL,rioWriteBulkString(&cmd,"REPLACE",7));
/* Tranfer the query to the other node in 64K chunks. */
errno = 0;
{
sds buf = cmd.io.buffer.ptr;
size_t pos = 0, towrite;
@ -1857,15 +1865,19 @@ void migrateCommand(redisClient *c) {
return;
socket_wr_err:
addReplySds(c,sdsnew("-IOERR error or timeout writing to target instance\r\n"));
sdsfree(cmd.io.buffer.ptr);
migrateCloseSocket(c->argv[1],c->argv[2]);
if (errno != ETIMEDOUT && retry_num++ == 0) goto try_again;
addReplySds(c,
sdsnew("-IOERR error or timeout writing to target instance\r\n"));
return;
socket_rd_err:
addReplySds(c,sdsnew("-IOERR error or timeout reading from target node\r\n"));
sdsfree(cmd.io.buffer.ptr);
migrateCloseSocket(c->argv[1],c->argv[2]);
if (errno != ETIMEDOUT && retry_num++ == 0) goto try_again;
addReplySds(c,
sdsnew("-IOERR error or timeout reading from target node\r\n"));
return;
}