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https://issues.apache.org/jira/browse/HBASE-5344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203286#comment-13203286
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Phabricator commented on HBASE-5344:
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stack has commented on the revision "[jira] [HBASE-5344] [89-fb] Scan
unassigned region directory on master failover".
I should work on the forward-port to trunk of this patch (it won't look much
like this when done but there is some good stuff in here).
INLINE COMMENTS
src/main/java/org/apache/hadoop/hbase/master/DirectRegionServerScanner.java:50
Nice. Should we do same in trunk?
src/main/java/org/apache/hadoop/hbase/master/DirectRegionServerScanner.java:156
Single thread access in here only?
src/main/java/org/apache/hadoop/hbase/master/HMaster.java:1207 This is
interesting. YOu just trying to figure who called this method?
src/main/java/org/apache/hadoop/hbase/master/ZKUnassignedWatcher.java:62 We
should do this in trunk too...
src/main/java/org/apache/hadoop/hbase/master/HMaster.java:254 So, you'd do
this rather than wait on the regionservers to report in? Via heartbeat?
I need to glean from this patch stuff that will help our trunk story.
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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