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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2014/12/24 20:41:13 UTC
[jira] [Resolved] (HBASE-2486) Add simple "anti-entropy" for region
assignment
[ https://issues.apache.org/jira/browse/HBASE-2486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Purtell resolved HBASE-2486.
-----------------------------------
Resolution: Incomplete
Assignee: (was: Eugene Koontz)
Release Note: (was: Adds new property "hbase.master.sanitychecking" which determines how master should handle situations where the master believes a region is hosted by a certain regionserver, but that regionserver indicates by throwing a 'No Such Region' exception, that it does not serve that region:
lax - mark region as unassigned and continue
paranoid - shut down master)
Incomplete dead issue, superseded by one or two master rewrites by now
> 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
> Labels: moved_from_0_20_5
> 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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