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From "Jungtaek Lim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-24541) TCP based shuffle
Date Fri, 01 Feb 2019 05:25:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-24541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757985#comment-16757985
] 

Jungtaek Lim commented on SPARK-24541:
--------------------------------------

Continuous processing requires "single stage" to let all tasks launching all the time, as
well as processing never stops. It works with query which only has map-like transformations,
but stateful operations normally requires hash-partitioning so Spark should have some mechanism
to route rows directly (as same as other streaming frameworks are doing).

Some of works were done around more than half a year ago so I cannot remember correctly, but
the POC-like work is done with RPC, and this issue tracks the effort of changing them to TCP.

> TCP based shuffle
> -----------------
>
>                 Key: SPARK-24541
>                 URL: https://issues.apache.org/jira/browse/SPARK-24541
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Structured Streaming
>    Affects Versions: 2.4.0
>            Reporter: Jose Torres
>            Priority: Major
>




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