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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-246) Periodic worker calls to context.progress() will prevent timeout on some Hadoop clusters during barrier waits
Date Sat, 14 Jul 2012 18:47:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414472#comment-13414472
] 

Eli Reisman commented on GIRAPH-246:
------------------------------------

Alessandro, thanks for your thoughtful input.

Before pruning out calls to progress() anywhere, I would caution to look into the much larger
issue that any worker failure in Giraph for any reason (even a healthy worker than simply
didn't call progress() often enough) causes a cascading failure in the whole job. This means
the longest-running (most overloaded) worker in any job can cause the failure of the whole
job.

This JIRA is narrowly focused and does not attempt to address those larger issues, just make
minimal changes in order to functionally solve the problem for now, in the same way it is
solved in other parts of the codebase.

So, in regards to GIRAPH-76, great idea, but too comprehensive for what I'm trying to do as
that solution extends into many other areas. Thanks for the idea though!

                
> Periodic worker calls to context.progress() will prevent timeout on some Hadoop clusters
during barrier waits
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: GIRAPH-246
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-246
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp
>    Affects Versions: 0.2.0
>            Reporter: Eli Reisman
>            Assignee: Eli Reisman
>            Priority: Minor
>              Labels: hadoop, patch
>             Fix For: 0.2.0
>
>         Attachments: GIRAPH-246-1.patch, GIRAPH-246-2.patch, GIRAPH-246-3.patch
>
>
> This simple change creates a command-line configurable option in GiraphJob to control
the time between calls to context().progress() that allows workers to avoid timeouts during
long data load-ins in which some works complete their input split reads much faster than others,
or finish a super step faster. I found this allowed jobs that were large-scale but with low
memory overhead to complete even when they would previously time out during runs on a Hadoop
cluster. Timeout is still possible when the worker crashes or runs out of memory or has other
GC or RPC trouble that is legitimate, but prevents unintentional crashes when the worker is
actually still healthy.

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