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https://issues.apache.org/jira/browse/BEAM-4565?focusedWorklogId=112966&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-112966
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ASF GitHub Bot logged work on BEAM-4565:
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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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