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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (BEAM-4565) Hot key fanout should not distribute keys to all shards.
Date Tue, 19 Jun 2018 00:52:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-4565?focusedWorklogId=112966&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-112966
]

ASF GitHub Bot logged work on BEAM-4565:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Jun/18 00:51
            Start Date: 19/Jun/18 00:51
    Worklog Time Spent: 10m 
      Work Description: katsiapis commented on issue #5649: [BEAM-4565] Fix hot key fanout
in the face of combiner lifting.
URL: https://github.com/apache/beam/pull/5649#issuecomment-398239850
 
 
   Pre-existing issue:
   
         combine_per_key = combine_per_key.with_hot_key_fanout(fanout)
   
   should be 
   
         combine_per_key = combine_per_key.with_hot_key_fanout(self.fanout)
   
   (Ie a "self" was missing).
   
   Do we understand why tests are passing nonetheless?

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 112966)
    Time Spent: 0.5h  (was: 20m)

> Hot key fanout should not distribute keys to all shards.
> --------------------------------------------------------
>
>                 Key: BEAM-4565
>                 URL: https://issues.apache.org/jira/browse/BEAM-4565
>             Project: Beam
>          Issue Type: Task
>          Components: sdk-java-core, sdk-py-core
>    Affects Versions: 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0
>            Reporter: Robert Bradshaw
>            Assignee: Kenneth Knowles
>            Priority: Major
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> The goal is to reduce the number of value sent to a single post-GBK worker. If combiner
lifting happens, each bundle will sends a single value per sub-key, causing an N-fold blowup
in shuffle data and N reducers with the same amount of data to consume as the single reducer
in the non-fanout case. 



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