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https://issues.apache.org/jira/browse/BEAM-9748?focusedWorklogId=421740&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-421740
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ASF GitHub Bot logged work on BEAM-9748:
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Author: ASF GitHub Bot
Created on: 13/Apr/20 23:32
Start Date: 13/Apr/20 23:32
Worklog Time Spent: 10m
Work Description: jkff commented on issue #11406: [BEAM-9748] Move
Reparallelize transform to Reshuffle
URL: https://github.com/apache/beam/pull/11406#issuecomment-613147215
The comments inside Reparallelize explain how this transform differs from
Reshuffle.viaRandomKey(): it performs dramatically better on Dataflow in case
the input PCollection is generated highly sequentially, as in the case of
reading several GB of JDBC results. It almost certainly performs somewhat worse
if the input PCollection is generated in a well-parallelized way, but I haven't
measured that; I haven't measured the former case for non-Dataflow runners
either.
I think it's reasonable to move this to Reshuffle, but rename it to
something more clear: maybe Reshuffle.forSequentiallyGeneratedInput()?
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Issue Time Tracking
-------------------
Worklog Id: (was: 421740)
Time Spent: 1.5h (was: 1h 20m)
> Move Reparallelize transform to Reshuffle
> -----------------------------------------
>
> Key: BEAM-9748
> URL: https://issues.apache.org/jira/browse/BEAM-9748
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Ismaël Mejía
> Assignee: Ismaël Mejía
> Priority: Minor
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Some DoFn based IOs like JdbcIO and RedisIO rely on the Reparallelize
> transform,
> a combination of a an empty PCollectionView and Reshuffle to force the
> materialization and reparallelize a PCollection. The idea of this issue is to
> extract this transform and expose it as part of the internal Reshuffle
> transform to avoid repeating the code for transforms (notably IOs) that
> require
> to reparallelize its output.
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