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From "Josh Wills (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-579) Support Counters from Custom RecordWriters
Date Mon, 23 Nov 2015 00:14:11 GMT


Josh Wills commented on CRUNCH-579:

Seems like an obviously good idea.

> Support Counters from Custom RecordWriters
> ------------------------------------------
>                 Key: CRUNCH-579
>                 URL:
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Micah Whitacre
>            Assignee: Josh Wills
>         Attachments: CRUNCH-579.patch
> A consumer mentioned this on the mailing list:
> {quote}
> So we wrote a custom Crunch Target to write data to a particular location which included
providing RecordWriters, OutputFormat, OutCommitters and such. Now we  wanted to add Counters
to get a count of how much data our reducers are writing. A most obvious design was to use
the TaskAttemptContext that gets passed to the RecordWriter and use the getCounter() method
on it to manipulate the counters. However, that did not work as expected and even though the
counters were getting incremented, they did not show up on the Resource Manager UI. On further
investigation I found that, cruch mangles this context object to add in a named output via
the CrunchOutputs class[1] which basically makes the counters useless within the recordwriter
> Would it be a feasible enhancement for the CrunchOutputs to pass in the original base
context object along with the modified one with named outputs so that it can be used for counters?
Any other suggestions are most welcome as well.
> {quote}

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