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Posted to issues@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/05/03 22:37:00 UTC
[jira] [Work logged] (BEAM-7220) add JavaReadViaImpulse
substitution to Java expansion service
[ https://issues.apache.org/jira/browse/BEAM-7220?focusedWorklogId=237092&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-237092 ]
ASF GitHub Bot logged work on BEAM-7220:
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Author: ASF GitHub Bot
Created on: 03/May/19 22:36
Start Date: 03/May/19 22:36
Worklog Time Spent: 10m
Work Description: ihji commented on pull request #8491: [BEAM-7220] add JavaReadViaImpulse substitution to Java expansion service
URL: https://github.com/apache/beam/pull/8491
The issue I tried to fix with #8396 can be solved by this PR. The problem was that `Read` transform which generates any other types than those covered by standard coders causes `ClassCastException`. Currently, `Read` transform is handled by `FlinkRunner` itself and `WireCoder` for runners only allows length-prefixed byte array coder for all non-standard types. We can fix `ClassCastException` by substituting `Read` transforms with `Impulse+DoFn` as we do in `PortableRunner`.
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Issue Time Tracking
-------------------
Worklog Id: (was: 237092)
Time Spent: 10m
Remaining Estimate: 0h
> add JavaReadViaImpulse substitution to Java expansion service
> -------------------------------------------------------------
>
> Key: BEAM-7220
> URL: https://issues.apache.org/jira/browse/BEAM-7220
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Heejong Lee
> Assignee: Heejong Lee
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Read transform is not supported in the portability framework. `PortableRunner` substitutes Read transform with Impulse + DoFn before it submits a pipeline to JobServer. However, when ExternalTransform is used, this substitution logic doesn't work. Looks like it should be done in the expansion service instead until we completely remove JavaReadViaImpulse hack.
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