[ https://issues.apache.org/jira/browse/YARN-5685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530951#comment-15530951 ]
Daniel Templeton commented on YARN-5685: ---------------------------------------- I think I finally get it. The net is that HA now requires either Curator or embedded to be enabled. Letting the {{ZKRMStateStore}} handle the RM state transitions is no longer an option and hasn't been for a while. There are only three ways {{transitionToActive()}} gets called: # {{EmbeddedElectorService.becomeActive()}} -- embedded failover # {{LeaderElectorService.isLeader()}} -- curator failover # {{AdminService.transitionToActive()}} -- CLI The question is what to do about non-embedded failover. I don't think it's worth making non-embedded failover work again. I think we're better off declaring non-embedded failover to be dead and removing the option altogether. Given that this has been broken for a while and no one has noticed, I'm going to bump the priority down a bit. > Non-embedded HA failover is broken > ---------------------------------- > > Key: YARN-5685 > URL: https://issues.apache.org/jira/browse/YARN-5685 > Project: Hadoop YARN > Issue Type: Bug > Components: resourcemanager > Affects Versions: 2.9.0, 3.0.0-alpha1 > Reporter: Daniel Templeton > Assignee: Daniel Templeton > Priority: Critical > > YARN-4559 broke RM HA when embedded automatic failover is disabled. The > {{ZKRMStateStore}} will now only start its monitoring thread when automatic > failover not enabled (which is patently useless). I presume the intended > change was to have the monitoring thread started when automatic failover is > not *embedded*. > If HA is enabled with automatic failover enabled and embedded failover > disabled, all RMs all come up in standby state. To make one of them active, > the {{--forcemanual}} flag must be used when manually triggering the state > change. Should the active go down, the standby will not become active and > must be manually transitioned with the {{--forcemanual}} flag. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org