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From tgroh <...@git.apache.org>
Subject [GitHub] incubator-beam pull request #1287: Use Coarser Updates in WatermarkManager
Date Fri, 04 Nov 2016 22:42:50 GMT
GitHub user tgroh opened a pull request:

    https://github.com/apache/incubator-beam/pull/1287

    Use Coarser Updates in WatermarkManager

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
    
     - [ ] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
     - [ ] Make sure tests pass via `mvn clean verify`. (Even better, enable
           Travis-CI on your fork and ensure the whole test matrix passes).
     - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue
           number, if there is one.
     - [ ] If this contribution is large, please file an Apache
           [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.txt).
    
    ---
    Rather than tracking elements independently, track the bundles that are pending.
    
    Incrementally update pending elements when work completes. Attempt to obtain the
    lock whenever work completes and do a small amount of maintenance work, but do
    nothing if the lock is not immediately available.

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

    $ git pull https://github.com/tgroh/incubator-beam incremental_pending_elements

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

    https://github.com/apache/incubator-beam/pull/1287.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 #1287
    
----
commit 1eb110384417924f5cc4f64ce887724807c6941d
Author: Thomas Groh <tgroh@google.com>
Date:   2016-11-04T18:28:03Z

    Incrementally update Pending elements when work completes
    
    This reduces the amount of single-threaded updates the monitor thread
    performs before firing timers.

commit b1400c905ccbf6b6887c1dcd4e65157e5bc357c1
Author: Thomas Groh <tgroh@google.com>
Date:   2016-11-04T19:54:00Z

    Track Minimum Element Timestamps within Bundles
    
    This allows the Watermark Manager to track pending elements by bundles
    of elements rather than per-element, which significantly reduces the
    amount of work done per-element to track watermarks.

----


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