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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HAMA-352) Can't send one more messages on to same server in bsp() method
Date Tue, 05 Apr 2011 10:35:05 GMT

     [ https://issues.apache.org/jira/browse/HAMA-352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Edward J. Yoon resolved HAMA-352.
---------------------------------

       Resolution: Fixed
    Fix Version/s: 0.2.0

This issue is fixed.

> Can't send one more messages on to same server in bsp() method
> --------------------------------------------------------------
>
>                 Key: HAMA-352
>                 URL: https://issues.apache.org/jira/browse/HAMA-352
>             Project: Hama
>          Issue Type: Bug
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.2.0
>
>         Attachments: patch.txt
>
>
> Oh, thanks for nice report!
> At this time, it looks like impossible to send one more messages on to
> same server in bsp() method. It's a bug. I'll fix it now.
> Pls, update your TRUNK.
> ----
> To developers,
> See the BSPPeer.send() method. The peerName should be a
> InetSocketAddress, not String. Otherwise, queue will be always null.
> And after add msg to queue, we have to put it to "outgoingQueues"
> again as below:
> --- src/java/org/apache/hama/bsp/BSPPeer.java   (revision 1069189)
> +++ src/java/org/apache/hama/bsp/BSPPeer.java   (working copy)
> @@ -140,12 +140,12 @@
>   @Override
>   public void send(String peerName, BSPMessage msg) throws IOException {
>     LOG.debug("Send bytes (" + msg.getData().toString() + ") to " + peerName);
> -    ConcurrentLinkedQueue<BSPMessage> queue = outgoingQueues.get(peerName);
> +    ConcurrentLinkedQueue<BSPMessage> queue =
> outgoingQueues.get(getAddress(peerName));
>     if (queue == null) {
>       queue = new ConcurrentLinkedQueue<BSPMessage>();
> -      outgoingQueues.put(getAddress(peerName), queue);
>     }
>     queue.add(msg);
> +    outgoingQueues.put(getAddress(peerName), queue);
> - Hide quoted text -
>   }
> On Mon, Feb 14, 2011 at 7:02 PM, PaweĊ‚ Brach <braszek@gmail.com> wrote:
> > Hello,
> >
> > I'm attaching PiEstimator with some changes. I'm sending exactly two
> > messages to "master" from each node.
> >
> >       bspPeer.send(masterTask, estimate);
> >       LOG.info("Send message:" + System.currentTimeMillis());
> >       bspPeer.send(masterTask, estimate2);
> >       LOG.info("Send message:" + System.currentTimeMillis());
> >
> > After that I'm trying to receive all messages:
> >      LOG.info("Num msg = " + bspPeer.getNumCurrentMessages());
> >       while ((received = bspPeer.getCurrentMessage()) != null) {
> >         LOG.info("Receives messages:" + Bytes.toDouble(received.getData()));
> >        ....
> >       }
> >
> > In the log file I see:
> > 2011-02-14 09:46:07,124 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator: Send message:1297673167123
> > 2011-02-14 09:46:07,125 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator: Send message:1297673167125
> > 2011-02-14 09:46:07,270 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator: Receives messages:3.1536
> > 2011-02-14 09:46:07,270 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator: Receives messages:3.148
> > 2011-02-14 09:46:07,271 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator: Receives messages:3.1392
> > 2011-02-14 09:46:07,272 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 11/02/14 09:46:07 INFO
> > algorithms.PiEstimator$MyEstimator:
> > 2011-02-14 09:46:07,272 INFO org.apache.hama.bsp.TaskRunner:
> > attempt_201102140938_0003_m_000000_0 Estimated value of PI is
> > 3.1450000000000005
> >
> >
> > On each node I see that two messages are sent (so master should receive 6
> > messages - I have 3 nodes). In the log file I see only 3 records
> > "Receives...", so only 3 messages were processed by master task. I don'
> > understand why is that.
> >
> > What's more, I have tried to change line:
> > while ((received = bspPeer.getCurrentMessage()) != null) {
> >
> > to
> > if ((received = bspPeer.getCurrentMessage()) != null) {
> >
> > So there should be messages in the queue which are not processed. In my
> > opinion bsp() should be called again and again... and in consequence falls
> > in loop of calls. But it doesn't happen - bsp() method is run exactly once
> > and framework is probably hanging after last line of the bsp() code. Could
> > you explain this for me?
> >
> > Best regards,
> > Pawel
> >

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