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[BEAM-22] Correct sequence of pending element updates in InMemoryWatermarkManager - #264
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tgroh wants to merge 1 commit into
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[BEAM-22] Correct sequence of pending element updates in InMemoryWatermarkManager#264tgroh wants to merge 1 commit into
tgroh wants to merge 1 commit into
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tgroh
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Apr 29, 2016
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R: @bjchambers |
bjchambers
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Apr 29, 2016
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The description is a bit unclear -- please update. Also, this should probably have a test to verify proper behavior. |
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Apr 29, 2016
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Fixed description, added comment. The test is pretty complex, and I'm going to replace the update implementation with one that has a dedicated thread, and only on #extractFiredTimers; which will cause the test to no longer be particularly relevant. |
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b6d993aCompareBecause the WatermarkManager is not synchronized within the call to updatePending, the sequence in which pending queues are updated must be in such a manner as to add additional restrictions, then remove any restrictions which no longer apply. This ensures any intermediate read will see at worst a more restricted watermark than the actual watermark.
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…ashJoin [euphoria-flink] apache#260 Flink - broadcast hash join
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Be sure to do all of the following to help us incorporate your contribution
quickly and easily:
[BEAM-<Jira issue #>] Description of pull requestmvn clean verify. (Even better, enableTravis-CI on your fork and ensure the whole test matrix passes).
<Jira issue #>in the title with the actual Jira issuenumber, if there is one.
Individual Contributor License Agreement.
Adding additional pending elements/timers (and thus holds) always comes
before removing existing holds, so the watermark is never observed under
more stringent restrictions than currently exist.