Return-Path: 
 <issues-return-94115-apmail-hbase-issues-archive=hbase.apache.org@hbase.apache.org>
X-Original-To: apmail-hbase-issues-archive@www.apache.org
Delivered-To: apmail-hbase-issues-archive@www.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id BAB7DF5D0
	for <apmail-hbase-issues-archive@www.apache.org>;
 Fri, 19 Apr 2013 17:07:17 +0000 (UTC)
Received: (qmail 78085 invoked by uid 500); 19 Apr 2013 17:07:17 -0000
Delivered-To: apmail-hbase-issues-archive@hbase.apache.org
Received: (qmail 78040 invoked by uid 500); 19 Apr 2013 17:07:17 -0000
Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:issues-help@hbase.apache.org>
List-Unsubscribe: <mailto:issues-unsubscribe@hbase.apache.org>
List-Post: <mailto:issues@hbase.apache.org>
List-Id: <issues.hbase.apache.org>
Delivered-To: mailing list issues@hbase.apache.org
Received: (qmail 78031 invoked by uid 99); 19 Apr 2013 17:07:17 -0000
Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28)
    by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 19 Apr 2013 17:07:17 +0000
Date: Fri, 19 Apr 2013 17:07:17 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12643244.1366297288343.193960.1366391237378@arcas>
In-Reply-To: <JIRA.12643244.1366297288343@arcas>
References: <JIRA.12643244.1366297288343@arcas>
Subject: [jira] [Updated] (HBASE-8374) NullPointerException when launching
 the balancer due to
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394


     [ https://issues.apache.org/jira/browse/HBASE-8374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu updated HBASE-8374:
--------------------------

    Summary: NullPointerException when launching the balancer due to   (was: NPE when launching the balance)
    
> NullPointerException when launching the balancer due to 
> --------------------------------------------------------
>
>                 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, 8374-trunk-v5.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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira