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From "Chu Tong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4492) NameNodeConnector should prevent other balancers to run while the one is running
Date Fri, 15 Feb 2013 21:29:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579516#comment-13579516
] 

Chu Tong commented on HDFS-4492:
--------------------------------

yea, HDFS-4505 is used to fix the real bug behind the balancer problem.
                
> NameNodeConnector should prevent other balancers to run while the one is running
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-4492
>                 URL: https://issues.apache.org/jira/browse/HDFS-4492
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 2.0.2-alpha
>            Reporter: Chu Tong
>            Assignee: Chu Tong
>            Priority: Blocker
>         Attachments: HDFS-4492.patch
>
>
> In hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java:
> private OutputStream checkAndMarkRunningBalancer() throws IOException {
>     try {
>       final DataOutputStream out = fs.create(BALANCER_ID_PATH);
>       out.writeBytes(InetAddress.getLocalHost().getHostName());
>       out.flush();
>       return out;
>     } catch(RemoteException e) {
> ...
> In the code, fs.create should set overwrite bit to false so that other balancer can't
run while one is running.

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