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https://issues.apache.org/jira/browse/HBASE-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Izaak Rubin resolved HBASE-703.
-------------------------------
Resolution: Fixed
I've attached a patch (HBASE-703.patch) that fixes the problem.
The problem originated in the HRegion splitting code. Each HRegionServer
maintains a collection of its daughter HRegions that are currently online.
When an HRegion was split, the parent HRegion would be correctly closed and
taken offline; however, the responsible HRegionServer was never informed of the
change. regionserver.jsp would display the HRegionServer's improperly updated
collection of online HRegions. The result was that all regions, even those
that were split and offline, were displayed in the UI.
The patch makes changes to HRegionServer.java and CompactSplitThread.java.
There is a new method in HRegionServer, removeFromOnlineRegions(region), which
removes the HRegion from the collection of online regions. This method is
called in CompactSplitThread.split().
What changed that created this bug? In branch/0.1, there was a notion of both
online regions and retiring regions, and there were separate collections for
each. There was also a listener structure (RegionUnavailableListener) built
into the splitting process that correctly handled the region transitions from
online to retiring to their removal. However, since this branch, the splitting
code has been simplified such that the listener and "retiring" regions no
longer exist. Since the listener was responsible for updating the
HRegionServer, its removal created the bug.
> Invalid regions listed by regionserver.jsp
> ------------------------------------------
>
> Key: HBASE-703
> URL: https://issues.apache.org/jira/browse/HBASE-703
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.2.0
> Reporter: Michaela Buergle
> Assignee: Izaak Rubin
> Priority: Minor
> Fix For: 0.2.0
>
>
> The region list displayed by regionserver.jsp contains regions that have
> ceased existence due to splits.
> Example:
> Region Name Encoded Name Start Key End Key
> ...
> maxentriestest,acacdk,1214292085212 732557990 acacdk
> maxentriestest,acacdk,1214297936860 1583424516 acacdk acqtzk
> maxentriestest,acacdk,1214293855954 1509492302 acacdk adhlxw
> maxentriestest,acqtzk,1214297936862 1120286366 acqtzk adhlxw
> maxentriestest,adhlxw,1214293855955 400707061 adhlxw
> maxentriestest,adhlxw,1214299372674 2060549477 adhlxw aelrxo
> maxentriestest,adhlxw,1214297324386 336026175 adhlxw afpxzs
> maxentriestest,aelrxo,1214299372674 1352588233 aelrxo afpxzs
> maxentriestest,afpxzs,1214297324387 1235754353 afpxzs
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