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

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

Mayur created HBASE-9109:
----------------------------

             Summary: 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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