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https://issues.apache.org/jira/browse/HBASE-2486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-2486:
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Status: Open (was: Patch Available)
Cancelling stale patch.
> Add simple "anti-entropy" for region assignment
> -----------------------------------------------
>
> Key: HBASE-2486
> URL: https://issues.apache.org/jira/browse/HBASE-2486
> Project: HBase
> Issue Type: Improvement
> Components: master, regionserver
> Affects Versions: 0.20.5
> Reporter: Todd Lipcon
> Assignee: Eugene Koontz
> Fix For: 0.92.0
>
> Attachments: hbase2486.diff, hbase2486.diff
>
>
> We've seen a number of bugs where a region server thinks it should not be
> serving a region, but the master and META think it should be. I'd like to
> propose a very simple way of fixing this issue:
> 1) whenever a regionserver throws a NotServingRegionException, it also marks
> that region id in an RS-wide Set
> 2) when a region sends a heartbeat, include a message for each of these
> regions, MSG_REPORT_NSRE or somesuch, and then clear the set
> 3) when the master receives MSG_REPORT_NSRE, it does the following checks:
> a) if the region is assigned elsewhere according to META, the NSRE was due to
> a stale client, ignore
> b) if the region is in transition, ignore
> c) otherwise, we have an inconsistency, and we should take some steps to
> resolve (eg mark the region unassigned, or exit the master if we are in
> "paranoid mode")
> Whatever we do, we need to make sure that this is loudly logged, and causes
> unit tests to fail, when it's detected. This should *not* happen, but when it
> does, it would be good to recover without addtable.rb, etc.
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