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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9109) Null pointer exception while invoking coprocessor.
Date Fri, 02 Aug 2013 14:21:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727700#comment-13727700
] 

Ted Yu commented on HBASE-9109:
-------------------------------

@Asha:
TestAggregateProtocol.java uses code very close to the snippet you gave. The test passes consistently.

Mind giving us some more detail ?
                
> Null pointer exception while invoking coprocessor.
> --------------------------------------------------
>
>                 Key: HBASE-9109
>                 URL: https://issues.apache.org/jira/browse/HBASE-9109
>             Project: HBase
>          Issue Type: Bug
>          Components: Client, Coprocessors
>    Affects Versions: 0.98.0
>         Environment: OS - CentOS release 6.2 (Final)
> JAVA - java version "1.6.0_22"
>        OpenJDK Runtime Environment (IcedTea6 1.10.4) (rhel-1.41.1.10.4.el6-x86_64)
>         OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
> Configuration: 3 node cluster with Hadoop-3.0
>            Reporter: Mayur
>             Fix For: 0.98.0
>
>
> This problem is observed when region server dies while an endpoint coprocessor is executing.
On the client side channel.getLastRegion() returns null and we get null pointer exception
while updating result map. 
> Following stack-trace is seen on client:
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:981)
> at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:128)
> at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:119)
> at java.util.TreeMap.put(TreeMap.java:530)
> at java.util.Collections$SynchronizedMap.put(Collections.java:1979)
> at org.apache.hadoop.hbase.client.HTable$17.update(HTable.java:1372)
> at org.apache.hadoop.hbase.client.HTable$18.call(HTable.java:1401)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)

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