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From "JongYoon Lim (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-972) Synchronization on local variable
Date Wed, 02 Sep 2015 09:36:46 GMT
JongYoon Lim created HAMA-972:

             Summary: Synchronization on local variable 
                 Key: HAMA-972
                 URL: https://issues.apache.org/jira/browse/HAMA-972
             Project: Hama
          Issue Type: Bug
          Components: bsp core
            Reporter: JongYoon Lim
            Priority: Minor

I'm not sure that the synchronization of the following code is proper. 
In the code, it uses the *call variable* as a lock. But it's a local variable. So whenever
this function is called, the lock is changed. I think this is a bug... What do you think..?
Is there anything that I'm missing..? 

// Client.java 
public Writable call(Writable param, ConnectionId remoteId)
      throws InterruptedException, IOException {
    Call call = new Call(param);

    Connection connection = getConnection(remoteId, call);

    connection.sendParam(call); // send the parameter
    boolean interrupted = false;

    synchronized (call) {
      int callFailCount = 0;
      while (!call.done) {
        try {
          call.wait(1000); // wait for the result
          // prevent client hang from response error
          if (callFailCount++ == IPC_CLIENT_CONNECT_MAX_RETRIES_DEFAULT)
        } catch (InterruptedException ie) {
          interrupted = true;

      if (interrupted) {
        // set the interrupt flag now that we are done waiting


      if (call.error != null) {
        if (call.error instanceof RemoteException) {
          throw call.error;
        } else { // local exception
          // use the connection because it will reflect an ip change,
          // unlike
          // the remoteId
          throw wrapException(connection.getRemoteAddress(), call.error);
      } else {
        return call.value;

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