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https://issues.apache.org/jira/browse/CRUNCH-658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772200#comment-16772200
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Andrew Olson commented on CRUNCH-658:
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Looks like skipping the getLastModifiedAt for sources & targets is another
potential optimization? Especially since it's only actually used (as far as I
can tell) if the WriteMode is CHECKPOINT. The implementations of getPathSize
and getLastModifiedAt in SourceTargetHelper are similar so I would expect them
to have the same performance issue with object stores.
> Add a way to skip the getSize checks for Sources from object stores
> -------------------------------------------------------------------
>
> Key: CRUNCH-658
> URL: https://issues.apache.org/jira/browse/CRUNCH-658
> Project: Crunch
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.14.0
> Reporter: Josh Wills
> Assignee: Josh Wills
> Priority: Major
>
> Ran into a problem when using Crunch to process a _lot_ of data from S3: the
> getSize checks can be very slow to run and don't materially add much to the
> overall processing of a pipeline when things like reducer counts are manually
> specified. I'd like to add a way to disable the file size checks, either
> globally or for specific input sources.
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