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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8374) NPE when launching the balance
Date Thu, 18 Apr 2013 17:48:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635412#comment-13635412
] 

Hadoop QA commented on HBASE-8374:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12579361/8374-trunk-v3.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/5346//console

This message is automatically generated.
                
> NPE when launching the balance
> ------------------------------
>
>                 Key: HBASE-8374
>                 URL: https://issues.apache.org/jira/browse/HBASE-8374
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 0.95.0
>         Environment: AWS / real cluster with 3 nodes + master
>            Reporter: Nicolas Liochon
>            Assignee: Ted Yu
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: 8374-trunk.txt, 8374-trunk-v2.txt, 8374-trunk-v3.txt, 8374-trunk-v4.txt
>
>
> I don't reproduce this all the time, but I had it on a fairly clean env.
> It occurs every 5 minutes (i.e. the balancer period). Impact is severe: the balancer
does not run. When it starts to occurs, it occurs all the time. I haven't tried to restart
the master, but I think it should be enough.
> Now, looking at the code, the NPE is strange. 
> {noformat}
> 2013-04-18 08:09:52,079 ERROR [box,60000,1366281581983-BalancerChore] org.apache.hadoop.hbase.master.balancer.BalancerChore:
Caught exception
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.<init>(BaseLoadBalancer.java:145)
> 	at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:194)
> 	at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1295)
> 	at org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:48)
> 	at org.apache.hadoop.hbase.Chore.run(Chore.java:81)
> 	at java.lang.Thread.run(Thread.java:662)
> 2013-04-18 08:09:52,103 DEBUG [box,60000,1366281581983-CatalogJanitor] org.apache.hadoop.hbase.client.ClientScanner:
Creating scanner over .META. starting at key ''
> {noformat}
> {code}
>           if (regionFinder != null) {
>             //region location
>             List<ServerName> loc = regionFinder.getTopBlockLocations(region);
>             regionLocations[regionIndex] = new int[loc.size()];
>             for (int i=0; i < loc.size(); i++) {
>               regionLocations[regionIndex][i] = serversToIndex.get(loc.get(i));  // <=========
NPE here
>             }
>           }
> {code}
> pinging [~enis], just in case.

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