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https://issues.apache.org/jira/browse/HBASE-9109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727588#comment-13727588
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asha koshti commented on HBASE-9109:
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Even i am facing the issue in using coprocessor for doing sum.
AggregationClient aClient = new AggregationClient(conf);
final ColumnInterpreter<Long, Long> ci = new LongColumnInterpreter();
Scan scan = new Scan();
scan.addColumn(Bytes.toBytes("info"),Bytes.toBytes("hits"));
long sum = aClient.sum(Bytes.toBytes("demo"), ci, scan);
> 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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