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Date: Tue, 12 Feb 2013 18:27:12 +0000 (UTC)
From: "Chu Tong (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12632016.1360692254786.279118.1360693632721@arcas>
In-Reply-To: <JIRA.12632016.1360692254786@arcas>
References: <JIRA.12632016.1360692254786@arcas>
Subject: [jira] [Updated] (HDFS-4492) NameNodeConnector should prevent other
 balancers to run while the one is running
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     [ https://issues.apache.org/jira/browse/HDFS-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chu Tong updated HDFS-4492:
---------------------------

    Status: Open  (was: Patch Available)
    
> 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
>            Priority: Minor
>         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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