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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GIRAPH-246) Periodic worker calls to context.progress() will prevent timeout on some Hadoop clusters during barrier waits
Date Wed, 08 Aug 2012 06:04:10 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Reisman updated GIRAPH-246:
-------------------------------

    Attachment: GIRAPH-246-9.patch

I want to make sure the progress call is directly used in lock calls not just waitForever(),
but not inside the try blocks. This should work, still trying to get a moment on the cluster
to really ramp it up but so far so good.

>From what Jakob suspected progress calls via Progressable weren't working. I also think
after looking at it that we needed a few extra calls where the my old patch had them, and
a call within the timed lock call (but not in the lock) as well as in wait forever.

I guess the progress calls have to rack up a while, then the real IPC call to Hadoop is made.
So calling it  more frequently than it looks wise to is apparently not a bad thing. I'm not
sure this works yet, the only one I've gotten to work for sure is the one I put up earlier,
but I'm trying to find a marriage of the two that will let my jobs finish and keep the context
in the Predicate lock as Avery asked. So far this one is looking good but I'll confirm tomorrow
AM if I get some good longer runs in tonight.


                
> 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, GIRAPH-246-4.patch,
GIRAPH-246-5.patch, GIRAPH-246-6.patch, GIRAPH-246-7.patch, GIRAPH-246-8.patch, GIRAPH-246-9.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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