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https://issues.apache.org/jira/browse/FLINK-2778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14936830#comment-14936830
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ASF GitHub Bot commented on FLINK-2778:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1196#issuecomment-144396998
They are called `nonParallel` there because non-keyed windows cannot be
computed in parallel in the general case. (The general case is when you want to
evaluate the window over all elements in a map-style function). Only in special
cases can the window be pre-computed in parallel and then merged.
> Add API for non-parallel non-keyed Windows
> ------------------------------------------
>
> Key: FLINK-2778
> URL: https://issues.apache.org/jira/browse/FLINK-2778
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Fix For: 0.10
>
>
> This addresses the NonParallelWindowStream section in the design doc:
> https://cwiki.apache.org/confluence/display/FLINK/Streams+and+Operations+on+Streams
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