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https://issues.apache.org/jira/browse/FLINK-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15266475#comment-15266475
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ASF GitHub Bot commented on FLINK-3581:
---------------------------------------
GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/1957
[FLINK-3581] [FLINK-3582] State Iterator and Aligned Time Windows
This adds two things. A new call `getPartitionedStateForAllKeys` on
`AbstractStateBackend` that returns a `StateIterator` that can be used to
iterate over all keys with their respective state in a partition.
The second addition is a new special-purpose window operator
`AlignedEventTimeWindowOperator` that behaves like `WindowOperator` if a
`Sliding/TumblingEventTimeWindows` assigner is used with an `EventTimeTrigger`.
The new operator does this without keeping state/timers per window and key,
only one timer is kept per window. Upon firing, the new `StateIterator` is used
to traverse all keys and emit windows.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aljoscha/flink
window-aligned-special-case-as-operator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1957.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 #1957
----
commit 57af40ec71da20e5a9a5052959a3d1f5750c21f8
Author: Aljoscha Krettek <[email protected]>
Date: 2016-03-07T16:06:34Z
[FLINK-3582] Add Iterator over State for All Keys in Partitioned State
commit 65a0fff2ceca04b7ccfdd8a3632e0a98300d3509
Author: Aljoscha Krettek <[email protected]>
Date: 2016-03-07T16:06:34Z
[FLINK-3581] Add Special Aligned Event-Time WindowOperator
----
> Add Special Aligned Event-Time WindowOperator
> ---------------------------------------------
>
> Key: FLINK-3581
> URL: https://issues.apache.org/jira/browse/FLINK-3581
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> The current Window Trigger is per key. Meaning every window has a (logical)
> Trigger for every key in the window, i.e. there will be state and time
> triggers per key per window.
> For some types of windows, i.e. based on time it is possible to use a single
> Trigger to fire for all keys at the same time. In that case we would save a
> lot of space on state and timers. Which makes state snapshots a lot smaller.
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