[jira] [Commented] (HBASE-9109) Null pointer exception while invoking coprocessor.

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726546#comment-13726546 ] 

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

Why did the region server crash, do you know ?
                
> 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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