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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7561) Add support for pre-aggregation in DataStream API
Date Wed, 30 Aug 2017 15:55:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16147491#comment-16147491

ASF GitHub Bot commented on FLINK-7561:

GitHub user pnowojski opened a pull request:


    [FLINK-7561][streaming] Implement PreAggregationOperator

    ## What is the purpose of the change
    To improve performance in certain situations this PR adds basic implementation of pre-aggregation
operator for DataStream API.
    ## Verifying this change
    This change added `PreAggregationOperatorTest`
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency):  no 
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
      - The serializers: no
      - The runtime per-record code paths (performance sensitive): no
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: no
    ## Documentation
      - Does this pull request introduce a new feature? yes
      - If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented):
extensive JavaDocs.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/pnowojski/flink pre-aggregate

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4626
commit a87e014edba94bb968467c08872cd074e1a9051d
Author: Piotr Nowojski <piotr.nowojski@gmail.com>
Date:   2017-08-30T13:06:10Z

    [FLINK-7561][streaming] Implement PreAggregationOperator
    Add first basic implementation of pre-aggregation for streaming API.


> Add support for pre-aggregation in DataStream API
> -------------------------------------------------
>                 Key: FLINK-7561
>                 URL: https://issues.apache.org/jira/browse/FLINK-7561
>             Project: Flink
>          Issue Type: New Feature
>          Components: DataStream API
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski

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