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Posted to commits@beam.apache.org by "Mark Shields (JIRA)" <ji...@apache.org> on 2016/04/06 00:20:25 UTC

[jira] [Created] (BEAM-175) Leak garbage collection timers in GlobalWindow

Mark Shields created BEAM-175:
---------------------------------

             Summary: Leak garbage collection timers in GlobalWindow
                 Key: BEAM-175
                 URL: https://issues.apache.org/jira/browse/BEAM-175
             Project: Beam
          Issue Type: Bug
          Components: runner-core
            Reporter: Mark Shields
            Assignee: Frances Perry


Consider the  transform:
  Window
    .into(new GlobalWindows())
    .triggering(
      Repeatedly.forever(
        AfterProcessingTime.pastFirstElementInPane().plusDelayOf(...)))
    .discardingFiredPanes()
This is a common idiom for 'process elements bunched by arrival time'.
Currently we create an end-of-window timer per key, which clearly will only fire if the pipeline is drained.
Better would be to avoid creating end-of-window timers if there's no state which needs to be processed at end-of-window (ie at drain if the Global window).



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