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https://issues.apache.org/jira/browse/HBASE-5344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208196#comment-13208196
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Phabricator commented on HBASE-5344:
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mbautin has commented on the revision "[jira] [HBASE-5344] [89-fb] Scan
unassigned region directory on master failover".
INLINE COMMENTS
src/main/java/org/apache/hadoop/hbase/master/HMaster.java:254 Yes, that is to
figure out whether it is fresh cluster startup. We do that by scanning the
regionservers directory in ZK and checking if it is empty. I will try to unify
cluster startup and failover cases in further iterations.
src/main/java/org/apache/hadoop/hbase/master/ZKUnassignedWatcher.java:171
Makes a lot of sense. Thanks!
REVISION DETAIL
https://reviews.facebook.net/D1605
> [89-fb] Scan unassigned region directory on master failover
> -----------------------------------------------------------
>
> Key: HBASE-5344
> URL: https://issues.apache.org/jira/browse/HBASE-5344
> Project: HBase
> Issue Type: Bug
> Reporter: Mikhail Bautin
> Assignee: Mikhail Bautin
> Attachments: D1605.1.patch
>
>
> In case the master dies after a regionserver writes region state as OPENED or
> CLOSED in ZK but before the update is received by master and written to meta,
> the new master that comes up has to pick up the region state from ZK and
> write it to meta. Otherwise we can get multiply-assigned regions.
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