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Refine comment in addReplyErrorLength() about replying to masters/slaves.

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See #5135 for some context.
This commit is contained in:
antirez 2018-07-18 17:40:07 +02:00
parent 8213f64d64
commit 6183f0590d
1 changed files with 11 additions and 0 deletions
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11
src/networking.c
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@ -342,6 +342,17 @@ void addReplyErrorLength(client *c, const char *s, size_t len) {
if (!len || s[0] != '-') addReplyString(c,"-ERR ",5);
addReplyString(c,s,len);
addReplyString(c,"\r\n",2);
/* Sometimes it could be normal that a slave replies to a master with
* an error and this function gets called. Actually the error will never
* be sent because addReply*() against master clients has no effect...
* A notable example is:
*
* EVAL 'redis.call("incr",KEYS[1]); redis.call("nonexisting")' 1 x
*
* Where the master must propagate the first change even if the second
* will produce an error. However it is useful to log such events since
* they are rare and may hint at errors in a script or a bug in Redis. */
if (c->flags & (CLIENT_MASTER|CLIENT_SLAVE)) {
char* to = c->flags & CLIENT_MASTER? "master": "slave";
char* from = c->flags & CLIENT_MASTER? "slave": "master";