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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GIRAPH-307) InputSplit list can be long with many workers (and locality info) and should not be re-created every time a worker calls reserveInputSplit()
Date Mon, 17 Sep 2012 20:06:07 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Reisman updated GIRAPH-307:
-------------------------------

    Attachment: GIRAPH-307-2.patch

Rebased this patch to be up to date with trunk as of Sept 17th. Since this patch also gives
full responsibility to the LocalityInfoSorter for loading, storing, and iterating on the InputSplit
path list, I changed its name to reflect its new level of responsibility and make the object's
lifecycle more obvious in the code.

Works, passes mvn verify, etc. should be ready for review.
                
> InputSplit list can be long with many workers (and locality info) and should not be re-created
every time a worker calls reserveInputSplit()
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: GIRAPH-307
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-307
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp, graph
>    Affects Versions: 0.2.0
>            Reporter: Eli Reisman
>            Assignee: Eli Reisman
>            Priority: Minor
>             Fix For: 0.2.0
>
>         Attachments: GIRAPH-307-1.patch, GIRAPH-307-2.patch
>
>
> While instrumenting the INPUT_SUPERSTEP and watching various runs, I see the input split
list generated every time a worker calls reserveInputSplit is, for all intents and purposes,
immutable per job. Therefore, we can save a fair amount of memory by not re-creating the list
and re-querying ZooKeeper on each pass to claim another split. Only the reserved and finished
children lists are ever mutated during the input phase of the job.

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