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https://issues.apache.org/jira/browse/HBASE-2022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans updated HBASE-2022:
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Attachment: HBASE-2022-v2.patch
I just added a log that reports the null value. Adding logging in Worker makes
it very chatty because when the master don't give anything to do the list is
empty so we get a null (expected). Also I don't think we should synchronize
every access since getting a null in housekeeping won't break anything.
Also. thinking about it, it's normal that the list gives null every time after
the first one because the list is still always empty.
> NPE in housekeeping kills RS
> ----------------------------
>
> Key: HBASE-2022
> URL: https://issues.apache.org/jira/browse/HBASE-2022
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.2
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Priority: Critical
> Fix For: 0.20.3, 0.21.0
>
> Attachments: HBASE-2022-v2.patch, HBASE-2022.patch
>
>
> Saw this on Zhenyu's 0.20.1 cluster (which for some weird reason seems to
> have many issues):
> {code}
> 2009-11-30 16:44:48,170 FATAL
> org.apache.hadoop.hbase.regionserver.HRegionServer: Unhandled exception.
> Aborting...
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.housekeeping(HRegionServer.java:1280)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:590)
> at java.lang.Thread.run(Thread.java:619)
> {code}
> This reminds me of HBASE-1386 and in fact this could be the same issue (but I
> can't confirm). Searching on the web gives me some hits and this is
> particularly interesting http://forums.sun.com/thread.jspa?threadID=5379669
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