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fix invalid master_link_down_since_seconds in info repication (#8785)

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When replica never successfully connect to master, server.repl_down_since
will be initialized to 0, therefore, the info master_link_down_since_seconds
was showing the current unix timestamp, which does not make much sense.

This commit fixes the issue by showing master_link_down_since_seconds to -1.
means the replica never connect to master before.

This commit also resets this variable back to 0 when a replica is turned into
a master, so that it'll behave the same if the master is later turned into a
replica again.

The implication of this change is that if some app is checking if the value is > 60
do something, like conclude the replica is stale, this could case harm (changing
a big positive number with a small one).
This commit is contained in:
Wen Hui 2021-04-19 02:34:21 -04:00 committed by GitHub
parent c0f5c678c2
commit 0413fbc7d0
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 5 additions and 1 deletions
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3
src/replication.c
View File

@ -2703,6 +2703,9 @@ void replicationUnsetMaster(void) {
* starting from now. Otherwise the backlog will be freed after a
* failover if slaves do not connect immediately. */
server.repl_no_slaves_since = server.unixtime;
/* Reset down time so it'll be ready for when we turn into replica again. */
server.repl_down_since = 0;
/* Fire the role change modules event. */
moduleFireServerEvent(REDISMODULE_EVENT_REPLICATION_ROLE_CHANGED,

3
src/server.c
View File

@ -5120,7 +5120,8 @@ sds genRedisInfoString(const char *section) {
if (server.repl_state != REPL_STATE_CONNECTED) {
info = sdscatprintf(info,
"master_link_down_since_seconds:%jd\r\n",
(intmax_t)(server.unixtime-server.repl_down_since));
server.repl_down_since ?
(intmax_t)(server.unixtime-server.repl_down_since) : -1);
}
info = sdscatprintf(info,
"slave_priority:%d\r\n"