GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/3034
[FLINK-5363] Fire timers when window state is currently empty
Before this change, when a Trigger sets a timer and that timer fires in
the future at a point when there is currently no data in the window
state, then that timer is being ignored.
This was a problem for some users because they manually set cleanup
timers and they need to be called because the trigger needs to cleanup
some state. (For normal time windows this is not a problem, but for
special cases built on top of GlobalWindows the old behaviour was
leading to problems.)
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- Documentation has been added for new functionality
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aljoscha/flink fire-trigger-with-empty-state
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3034.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 #3034
----
commit b8bfdf05ae9bfb546a223c5f638016a3e18f41bb
Author: Aljoscha Krettek <[email protected]>
Date: 2016-12-18T17:33:13Z
[FLINK-5363] Fire timers when window state is currently empty
Before this change, when a Trigger sets a timer and that timer fires in
the future at a point when there is currently no data in the window
state, then that timer is being ignored.
This was a problem for some users because they manually set cleanup
timers and they need to be called because the trigger needs to cleanup
some state. (For normal time windows this is not a problem, but for
special cases built on top of GlobalWindows the old behaviour was
leading to problems.)
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