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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-557) Implement Checkpointing service in Hama
Date Sat, 21 Jul 2012 06:30:35 GMT

    [ https://issues.apache.org/jira/browse/HAMA-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419751#comment-13419751
] 

Thomas Jungblut commented on HAMA-557:
--------------------------------------

bq.Most of our services get initialized by ReflectionUtils.newInstance. Until now we don't
have a common service that validates the interaction between each of these services. Let's
look into this once we have such a requirement. I also feel inits may have different signatures
for different services.

Actually we could break down inits to use configuration as parameters. But let's talk about
it when we need this.

bq. Hopefully, you were happy with the way refactored code interacted with each other. I wanted
these to be building blocks for future work.

this is really great code :)
                
> 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-505-557-610-611-v1.patch, 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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