GitHub user sjwiesman opened a pull request:
https://github.com/apache/flink/pull/3479
[FLINK-5929] Allow Access to Per-Window State in ProcessWindowFunction
Right now, the state that a WindowFunction or ProcessWindowFunction can
access is scoped to the key of the window but not the window itself.
That is, state is global across all windows for a given key.
For some use cases it is beneficial to keep state scoped to a window.
For example, if you expect to have several Trigger firings (due to early
and late firings) a user can keep state per window to keep some
information between those firings.
@aljoscha
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sjwiesman/flink FLINK-5929
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3479.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 #3479
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commit 623edd1fb107e8dd0aae755a7b252df1f91713bd
Author: Seth Wiesman <[email protected]>
Date: 2017-03-06T04:07:18Z
[FLINK-5929] Allow Access to Per-Window State in ProcessWindowFunction
Right now, the state that a WindowFunction or ProcessWindowFunction can
access is scoped to the key of the window but not the window itself.
That is, state is global across all windows for a given key.
For some use cases it is beneficial to keep state scoped to a window.
For example, if you expect to have several Trigger firings (due to early
and late firings) a user can keep state per window to keep some
information between those firings.
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