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Posted to issues@flink.apache.org by "Wenlong Lyu (JIRA)" <ji...@apache.org> on 2016/06/27 04:07:52 UTC
[jira] [Commented] (FLINK-2144) Incremental count, average, and
variance for windows
[ https://issues.apache.org/jira/browse/FLINK-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15350396#comment-15350396 ]
Wenlong Lyu commented on FLINK-2144:
------------------------------------
we also consider increment agg for sliding window currently, evicting window must re-compute all the data of the window, no reducing state mechanism is available.
> Incremental count, average, and variance for windows
> ----------------------------------------------------
>
> Key: FLINK-2144
> URL: https://issues.apache.org/jira/browse/FLINK-2144
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Reporter: Gabor Gevay
> Priority: Minor
> Labels: statistics
>
> By count I mean the number of elements in the window.
> These can be implemented very efficiently building on FLINK-2143:
> Store: O(1)
> Evict: O(1)
> emitWindow: O(1)
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