[jira] [Created] (HDFS-4492) NameNodeConnector should prevent other balancers to run while the one is running

["Chu Tong (JIRA)" <ji...@apache.org>]

Chu Tong created HDFS-4492:
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             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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