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From "Suraj Menon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-557) Implement Checkpointing service in Hama
Date Wed, 18 Jul 2012 18:31:35 GMT

    [ https://issues.apache.org/jira/browse/HAMA-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417349#comment-13417349
] 

Suraj Menon commented on HAMA-557:
----------------------------------

Take your time, this is a part of a big patch. I shall upload it shortly, I am still testing
it. 90% of patch was tested before I re-factored the code. I have few more unit tests to work
on and have to verify different situations on my small VM cluster before I release it to others.
I shall upload the current state of patch for a sneak-peek. Any effective way of reviewing
is fine with me.
                
> Implement Checkpointing service in Hama
> ---------------------------------------
>
>                 Key: HAMA-557
>                 URL: https://issues.apache.org/jira/browse/HAMA-557
>             Project: Hama
>          Issue Type: Sub-task
>          Components: bsp core
>    Affects Versions: 0.6.0
>            Reporter: Suraj Menon
>            Assignee: Suraj Menon
>             Fix For: 0.6.0
>
>         Attachments: HAMA-557-ft-framework.patch
>
>
> Implement checkpointing service in Apache Hama. My patches for HAMA-533 and HAMA-534
are blocked on this.
> - Checkpointing should be done as messages are either sent or received. I prefer while
receiving messages, as we can achieve some parallelism with asynchronous messages. Please
comment if you differ.
> - BSPMaster should hold the checkpoint status for each task. Checkpoint status includes
superstep count and file information for which checkpointing is complete
> - MessageManager should notify Checkpointer of a new message at BSPPeer.
> - Implement/Reuse MessageBundle class as splitClass in BSPPeerImpl for recovery in initInput.

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