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From joshfg <...@git.apache.org>
Subject [GitHub] flink pull request #2269: [FLINK-4190] Generalise RollingSink to work with a...
Date Tue, 19 Jul 2016 14:15:44 GMT
GitHub user joshfg opened a pull request:

    https://github.com/apache/flink/pull/2269

    [FLINK-4190] Generalise RollingSink to work with arbitrary buckets

    I've created a new bucketing package with a BucketingSink, which improves on the existing
RollingSink by enabling arbitrary bucketing, rather than just rolling files based on system
time.
    
    The main changes to support this are:
    
    - The Bucketer interface now takes the sink's input element as a generic parameter, enabling
us to bucket based on attributes of the sink's input.
    - While maintaining the same rolling mechanics of the existing implementation (e.g. rolling
when the file size reaches a threshold), the sink implementation can now have many 'active'
buckets at any point in time. The checkpointing mechanics have been extended to support maintaining
the state of multiple active buckets and files, instead of just one.
    - For use cases where the buckets being written to are changing over time, the sink now
needs to determine when a bucket has become 'inactive', in order to flush and close the file.
In the existing implementation, this is simply when the bucket path changes. Instead, we now
determine a bucket as inactive if it hasn't been written to recently. To support this there
are two additional user configurable settings: inactiveBucketCheckInterval and inactiveBucketThreshold.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/joshfg/flink flink-4190

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/2269.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2269
    
----
commit 2011e47de6c8b3c087772c84b4b3e44210dbe50c
Author: Josh <joshformangornall@gmail.com>
Date:   2016-07-12T17:38:54Z

    [FLINK-4190] Generalise RollingSink to work with arbitrary buckets

----


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