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From "William Bajzek (JIRA)" <>
Subject [jira] Updated: (CHUKWA-506) Add retry logic to MetricDataLoader
Date Wed, 04 Aug 2010 00:18:19 GMT


William Bajzek updated CHUKWA-506:

    Attachment: postProcessorRetry.patch

A patch which implements this. I have tested it out by starting chukwa, shutting down MySQL,
and then submitting a job. after the SQLException appeared in the postprocessor.log, I restarted
MySQL and waited. The next time the postprocessor ran, the data was correctly inserted into
the database.

Unfortunately, I can't get the unit tests to pass even with an unchanged, freshly checked
out copy of chukwa. They worked for me the other day, but not now, but I was told on chukwa-dev
to submit the patch for review anyway. 

> Add retry logic to MetricDataLoader
> -----------------------------------
>                 Key: CHUKWA-506
>                 URL:
>             Project: Chukwa
>          Issue Type: Improvement
>    Affects Versions: 0.4.0
>            Reporter: William Bajzek
>            Priority: Minor
>         Attachments: postProcessorRetry.patch
> When processing data in Chukwa, many steps along the way, when the encounter an error
condition, will attempt to reprocess the data a few times before giving up. This doesn't happen
in post processing (at least when using MetricDataLoader); for example if there is a SQLException
of any kind, it will move the data to the "inError" directory at which point it becomes AFAIK
a manual process to move the data back to be reprocessed, so it would be nice to retry a few
times in case the exception was transient (database was being bounced, or similar). 
> I will attach a patch to be reviewed.

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