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https://issues.apache.org/jira/browse/HBASE-8790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694087#comment-13694087
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ramkrishna.s.vasudevan commented on HBASE-8790:
-----------------------------------------------
+1 on patch.
> NullPointerException thrown when stopping regionserver
> ------------------------------------------------------
>
> Key: HBASE-8790
> URL: https://issues.apache.org/jira/browse/HBASE-8790
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.95.1
> Environment: CentOS 5.9 x86_64, java version "1.6.0_45", CDH4.3
> Reporter: Xiong LIU
> Assignee: Liang Xie
> Attachments: HBase-8790.txt
>
>
> The Hbase cluster is a fresh start with one regionserver.
> When we stop hbase, an unhandled NullPointerException is throwed in the
> regionserver.
> The regionserver's log is as follows:
> 2013-06-21 10:21:11,284 INFO [regionserver61020] regionserver.HRegionServer:
> Closing user regions
> 2013-06-21 10:21:14,288 DEBUG [regionserver61020] regionserver.HRegionServer:
> Waiting on 1028785192
> 2013-06-21 10:21:14,290 FATAL [regionserver61020] regionserver.HRegionServer:
> ABORTING region server HOSTNAME_TEST,61020,1371781086817
> : Unhandled: null
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRegionServer.java:988)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:832)
> at java.lang.Thread.run(Thread.java:662)
> 2013-06-21 10:21:14,292 FATAL [regionserver61020] regionserver.HRegionServer:
> RegionServer abort: loaded coprocessors are: [org.apache
> .hadoop.hbase.coprocessor.MultiRowMutationEndpoint]
> 2013-06-21 10:21:14,293 INFO [regionserver61020] regionserver.HRegionServer:
> STOPPED: Unhandled: null
> 2013-06-21 10:21:14,293 INFO [regionserver61020] ipc.RpcServer: Stopping
> server on 61020
> It seems that after closing user regions, the rssStub is null.
> update:
> we found that if setting hbase.client.ipc.pool.type to RoundRobinPool(or
> other pool type) and hbase.client.ipc.pool.size to 10(possibly other values)
> in hbase-site.xml, the regionserver is continuously attempting connect to
> master. and if we stop hbase, the above NullPointerException occurred. With
> hbase.client.ipc.pool.size set to 1, the cluster can be completely stopped.
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