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Cluster: ability to prevent slaves from failing over their masters.

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This commit, in some parts derived from PR #3041 which is no longer
possible to merge (because the user deleted the original branch),
implements the ability of slaves to have a special configuration
preventing that they try to start a failover when the master is failing.

There are multiple reasons for wanting this, and the feautre was
requested in issue #3021 time ago.

The differences between this patch and the original PR are the
following:

1. The flag is saved/loaded on the nodes configuration.
2. The 'myself' node is now flag-aware, the flag is updated as needed
   when the configuration is changed via CONFIG SET.
3. The flag name uses NOFAILOVER instead of NO_FAILOVER to be consistent
   with existing NOADDR.
4. The redis.conf documentation was rewritten.

Thanks to @deep011 for the original patch.
This commit is contained in:
antirez
2018-03-14 13:46:36 +01:00
parent 84b281209a
commit 432bf4770e
6 changed files with 70 additions and 2 deletions
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13
src/config.c
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@ -635,6 +635,14 @@ void loadServerConfigFromString(char *config) {
err = "cluster slave validity factor must be zero or positive";
goto loaderr;
}
} else if (!strcasecmp(argv[0],"cluster-slave-no-failover") &&
argc == 2)
{
server.cluster_slave_no_failover = yesnotoi(argv[1]);
if (server.cluster_slave_no_failover == -1) {
err = "argument must be 'yes' or 'no'";
goto loaderr;
}
} else if (!strcasecmp(argv[0],"lua-time-limit") && argc == 2) {
server.lua_time_limit = strtoll(argv[1],NULL,10);
} else if (!strcasecmp(argv[0],"slowlog-log-slower-than") &&
@ -997,6 +1005,8 @@ void configSetCommand(client *c) {
"repl-diskless-sync",server.repl_diskless_sync) {
} config_set_bool_field(
"cluster-require-full-coverage",server.cluster_require_full_coverage) {
} config_set_bool_field(
"cluster-slave-no-failover",server.cluster_slave_no_failover) {
} config_set_bool_field(
"aof-rewrite-incremental-fsync",server.aof_rewrite_incremental_fsync) {
} config_set_bool_field(
@ -1291,6 +1301,8 @@ void configGetCommand(client *c) {
/* Bool (yes/no) values */
config_get_bool_field("cluster-require-full-coverage",
server.cluster_require_full_coverage);
config_get_bool_field("cluster-slave-no-failover",
server.cluster_slave_no_failover);
config_get_bool_field("no-appendfsync-on-rewrite",
server.aof_no_fsync_on_rewrite);
config_get_bool_field("slave-serve-stale-data",
@ -2023,6 +2035,7 @@ int rewriteConfig(char *path) {
rewriteConfigYesNoOption(state,"cluster-enabled",server.cluster_enabled,0);
rewriteConfigStringOption(state,"cluster-config-file",server.cluster_configfile,CONFIG_DEFAULT_CLUSTER_CONFIG_FILE);
rewriteConfigYesNoOption(state,"cluster-require-full-coverage",server.cluster_require_full_coverage,CLUSTER_DEFAULT_REQUIRE_FULL_COVERAGE);
rewriteConfigYesNoOption(state,"cluster-slave-no-failover",server.cluster_slave_no_failover,CLUSTER_DEFAULT_SLAVE_NO_FAILOVER);
rewriteConfigNumericalOption(state,"cluster-node-timeout",server.cluster_node_timeout,CLUSTER_DEFAULT_NODE_TIMEOUT);
rewriteConfigNumericalOption(state,"cluster-migration-barrier",server.cluster_migration_barrier,CLUSTER_DEFAULT_MIGRATION_BARRIER);
rewriteConfigNumericalOption(state,"cluster-slave-validity-factor",server.cluster_slave_validity_factor,CLUSTER_DEFAULT_SLAVE_VALIDITY);