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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8519) Backup master will never come up if primary master dies during initialization
Date Mon, 13 May 2013 21:31:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656409#comment-13656409
] 

Jean-Daniel Cryans commented on HBASE-8519:
-------------------------------------------

bq. +        if (clusterShutDown.get() && !clusterStatusTracker.isClusterUp()) {

Do we still need the second statement?

Also I'm not a fan of clusterShutDown's name since the cluster could be down when the master
starts, or at least we need to doc more to explain why we don't care if the cluster is down
when we start.
                
> Backup master will never come up if primary master dies during initialization
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-8519
>                 URL: https://issues.apache.org/jira/browse/HBASE-8519
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.94.7, 0.95.0
>            Reporter: Jerry He
>            Assignee: Jerry He
>            Priority: Minor
>             Fix For: 0.98.0
>
>         Attachments: HBASE-8519-trunk.patch
>
>
> The problem happens if primary master dies after becoming master but before it completes
initialization and calls clusterStatusTracker.setClusterUp(),
> The backup master will try to become the master, but will shutdown itself promptly because
it sees 'the cluster is not up'.
> This is the backup master log:
> 2013-05-09 15:08:05,568 INFO org.apache.hadoop.hbase.master.metrics.MasterMetrics: Initialized
> 2013-05-09 15:08:05,573 DEBUG org.apache.hadoop.hbase.master.HMaster: HMaster started
in backup mode.  Stalling until master znode is written.
> 2013-05-09 15:08:05,589 INFO org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper:
Node /hbase/master already exists and this is not a retry
> 2013-05-09 15:08:05,590 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Adding
ZNode for /hbase/backup-masters/xxx.com,60000,1368137285373 in backup master directory
> 2013-05-09 15:08:05,595 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Another
master is the active master, xxx.com,60000,1368137283107; waiting to become the next active
master
> 2013-05-09 15:09:45,006 DEBUG org.apache.hadoop.hbase.master.ActiveMasterManager: No
master available. Notifying waiting threads
> 2013-05-09 15:09:45,006 INFO org.apache.hadoop.hbase.master.HMaster: Cluster went down
before this master became active
> 2013-05-09 15:09:45,006 DEBUG org.apache.hadoop.hbase.master.HMaster: Stopping service
threads
> 2013-05-09 15:09:45,006 INFO org.apache.hadoop.ipc.HBaseServer: Stopping server on 60000
>  
> In ActiveMasterManager::blockUntilBecomingActiveMaster()
> {code}
>   ..
>   if (!clusterStatusTracker.isClusterUp()) {
>           this.master.stop(
>             "Cluster went down before this master became active");
>         }
>   ..
> {code}

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