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Posted to issues@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/11/13 01:15:01 UTC
[jira] [Work logged] (BEAM-5775) Make the spark runner not
serialize data unless spark is spilling to disk
[ https://issues.apache.org/jira/browse/BEAM-5775?focusedWorklogId=165257&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-165257 ]
ASF GitHub Bot logged work on BEAM-5775:
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Author: ASF GitHub Bot
Created on: 13/Nov/18 01:14
Start Date: 13/Nov/18 01:14
Worklog Time Spent: 10m
Work Description: chamikaramj commented on issue #6714: [BEAM-5775] Spark: implement a custom class to lazily encode values for persistence.
URL: https://github.com/apache/beam/pull/6714#issuecomment-438091517
R: @iemejia can you please review or forward to somehow who is familiar with this code.
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Issue Time Tracking
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Worklog Id: (was: 165257)
Time Spent: 20m (was: 10m)
> Make the spark runner not serialize data unless spark is spilling to disk
> -------------------------------------------------------------------------
>
> Key: BEAM-5775
> URL: https://issues.apache.org/jira/browse/BEAM-5775
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Reporter: Mike Kaplinskiy
> Assignee: Amit Sela
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Currently for storage level MEMORY_ONLY, Beam does not coder-ify the data. This lets Spark keep the data in memory avoiding the serialization round trip. Unfortunately the logic is fairly coarse - as soon as you switch to MEMORY_AND_DISK, Beam coder-ifys the data even though Spark might have chosen to keep the data in memory, incurring the serialization overhead.
>
> Ideally Beam would serialize the data lazily - as Spark chooses to spill to disk. This would be a change in behavior when using beam, but luckily Spark has a solution for folks that want data serialized in memory - MEMORY_AND_DISK_SER will keep the data serialized.
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