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From "Chu Tong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4492) NameNodeConnector should prevent other balancers to run while the one is running
Date Tue, 12 Feb 2013 18:05:13 GMT
Chu Tong created HDFS-4492:
------------------------------

             Summary: 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


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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