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https://issues.apache.org/jira/browse/BEAM-5775?focusedWorklogId=217778&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-217778
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ASF GitHub Bot logged work on BEAM-5775:
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Author: ASF GitHub Bot
Created on: 25/Mar/19 01:45
Start Date: 25/Mar/19 01:45
Worklog Time Spent: 10m
Work Description: mikekap 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-476026946
@iemejia @VaclavPlajt updated. Sorry for the long wait.
As suggested by @iemejia I combined the two use cases of lazy serialization
- `ValueAndCoderLazySerializable` is almost a drop-in replacement for
`SerializableAccumulator`. I also converted the tests so the serialization is
now tested.
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Issue Time Tracking
-------------------
Worklog Id: (was: 217778)
Time Spent: 3h 40m (was: 3.5h)
> 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: Mike Kaplinskiy
> Priority: Minor
> Labels: triaged
> Time Spent: 3h 40m
> 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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