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From "Thomas Jungblut (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-515) Counter should be synchronized by sync()
Date Mon, 05 Mar 2012 13:35:57 GMT

    [ https://issues.apache.org/jira/browse/HAMA-515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222343#comment-13222343
] 

Thomas Jungblut commented on HAMA-515:
--------------------------------------

bq.Does that mean each bsp tasks do not want to call sync() but still want to access other
bsp tasks' updated superstep count?

I actually wanted to call sync to synchronize the counters. And it is not about superstep
notification here ;) However, this is a cool feature as well.
                
> Counter should be synchronized by sync()
> ----------------------------------------
>
>                 Key: HAMA-515
>                 URL: https://issues.apache.org/jira/browse/HAMA-515
>             Project: Hama
>          Issue Type: New Feature
>    Affects Versions: 0.4.0
>            Reporter: Thomas Jungblut
>            Priority: Minor
>             Fix For: 0.5.0
>
>
> We should synchronize the counters in all tasks after a sync() call. 
> Then someone can use it for flow control. E.G. graph related algorithms, to get the number
of globally updated vertices.
> Two options to solve this:
>  - Sync the whole stuff over RPC from the BSPMaster
>  - Use Zookeeper for counter handling

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