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https://issues.apache.org/jira/browse/BEAM-6670?focusedWorklogId=222587&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-222587
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ASF GitHub Bot logged work on BEAM-6670:
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Author: ASF GitHub Bot
Created on: 03/Apr/19 19:50
Start Date: 03/Apr/19 19:50
Worklog Time Spent: 10m
Work Description: iemejia commented on issue #7956: [BEAM-6670] Add
option to disable reshuffling of JdbcIO
URL: https://github.com/apache/beam/pull/7956#issuecomment-479633908
I don't think this deserves the discussion to go to the mailing list. Most
of us agree that this is an exceptional case where it makes sense to have this
option too, and the performance consequence for the mentioned case is worth the
knob. Of course not as a default.
I like @chamikaramj's proposal better, more user friendly, no fancy names.
but I will refine it to`withOutputParallelization`. for consistency if it keeps
the boolean argument. or without if there is no argument.
@noctune can you please fix this and rebase it so we can merge it. Thanks!
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Issue Time Tracking
-------------------
Worklog Id: (was: 222587)
Time Spent: 1.5h (was: 1h 20m)
> Option to disable reparallelization in JdbcIO.Read
> --------------------------------------------------
>
> Key: BEAM-6670
> URL: https://issues.apache.org/jira/browse/BEAM-6670
> Project: Beam
> Issue Type: Wish
> Components: io-java-jdbc
> Reporter: Mike Pedersen
> Priority: Minor
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> I'm doing approx. 20 JDBC queries against a database and then joining them
> together in a group by. Every single one of these queries does a reshuffle,
> which is sort of useless due to them being fed to a CoGroupByKey immediately
> afterwards.
> Reshuffle by default seems sensible by the principle of least surprise, but
> it would be nice to have a way to disable it when it's not necessary. For
> example a "withReshuffle(boolean)" method.
> This should be an easy addition and I am willing to add this if it sounds
> reasonable enough.
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