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From "Suraj Menon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-734) Hama Message Manager should be able to delegate the ownership of internal message queue on request for future superstep
Date Tue, 19 Feb 2013 00:35:12 GMT

    [ https://issues.apache.org/jira/browse/HAMA-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580921#comment-13580921
] 

Suraj Menon commented on HAMA-734:
----------------------------------

I agree. 

I have few questions: For message queues like DiskQueue, SpillingQueue, etc. are you suggesting
we won't call prepareRead and writes messages until a read is needed. If so, how do you configure
which superstep to start reading from? Say in the next algorithm, you want to hold messages
for any N supersteps. So if prepareRead and read is not initiated on these queues, what would
peer.getCurrentMessage return? In case of GraphJobRunner, you need a part of messages to be
read out of the queue. How else can we handle the situation. BSPMessageMappedStorage is a
means by which the framework is letting some advanced users to handle the messages themselves
as demonstrated in HAMA-704.patch-v1 This is purely for performance.

Instead of setSyncType, how about setSyncMessageQueueBehaviour(PERSIST | REFRESH | FILTER
..... )? Based on these constants, we can implement corresponding abstraction over BSPMessageMappedStorage.
For a particular algorithm, I want to keep the top N popular message values I receive. I would
want that as a feature in message handling. I won't implement separate synchronization scheme
again for this feature. 
                
> Hama Message Manager should be able to delegate the ownership of internal message queue
on request for future superstep
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HAMA-734
>                 URL: https://issues.apache.org/jira/browse/HAMA-734
>             Project: Hama
>          Issue Type: Improvement
>            Reporter: Suraj Menon
>
> Get the ownership of the messagequeue, to improve performance in scenarios when a certain
set of messages in the queue is to be used in a future superstep than the current one. With
this feature, the message queue could be stored for future without having to read them in
the current superstep. The framework would initialize and create a new message queue internally.

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