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Date: Fri, 10 Jan 2014 06:26:58 +0000 (UTC)
From: "Edward J. Yoon (JIRA)" <jira@apache.org>
To: dev@hama.apache.org
Message-ID: <JIRA.12688194.1389334939942.74630.1389335218926@arcas>
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References: <JIRA.12688194.1389334939942@arcas>
Subject: [jira] [Commented] (HAMA-842) Add persistent queue option to
 JobConf
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    [ https://issues.apache.org/jira/browse/HAMA-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13867552#comment-13867552 ] 

Edward J. Yoon commented on HAMA-842:
-------------------------------------

To reduce the number of additions, we have to check the size of localQueue and localQueueForNextIteration queues, and then switching intelligently.

> Add persistent queue option to JobConf
> --------------------------------------
>
>                 Key: HAMA-842
>                 URL: https://issues.apache.org/jira/browse/HAMA-842
>             Project: Hama
>          Issue Type: New Feature
>    Affects Versions: 0.6.3
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.7.0
>
>
> By default, incoming (local) queue will be reset in every superstep. It means that unconsumed messages will be lost. If this is persistent queue, unconsumed messages will be persisted in incoming queue.
> {code}
>   public final void clearOutgoingQueues() {
>     if (localQueue != null) {
>       localQueue.close();
>     }
>     localQueue = localQueueForNextIteration.getMessageQueue();
>     localQueue.prepareRead();
>     localQueueForNextIteration = getSynchronizedReceiverQueue();
>     notifyInit();
>   }
> {code}
> Simply we can add unconsumed messages to localQueueForNextIteration before switching local queue.


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