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Posted to issues@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/11/02 19:38:00 UTC
[jira] [Work logged] (BEAM-5928) ConcurrentModificationException
from RowCoderGenerator lazy caching
[ https://issues.apache.org/jira/browse/BEAM-5928?focusedWorklogId=162084&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-162084 ]
ASF GitHub Bot logged work on BEAM-5928:
----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Nov/18 19:37
Start Date: 02/Nov/18 19:37
Worklog Time Spent: 10m
Work Description: reuvenlax opened a new pull request #6927: [BEAM-5928] Change hash map to concurrent map.
URL: https://github.com/apache/beam/pull/6927
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Issue Time Tracking
-------------------
Worklog Id: (was: 162084)
Time Spent: 10m
Remaining Estimate: 0h
> ConcurrentModificationException from RowCoderGenerator lazy caching
> -------------------------------------------------------------------
>
> Key: BEAM-5928
> URL: https://issues.apache.org/jira/browse/BEAM-5928
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Benson Tucker
> Assignee: Reuven Lax
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h3. Summary:
> RowCoderGenerator caches a delegate Coder<Row> once encode or decode is exercised, but there's not an API for caching this delegate eagerly.
> h3. Use Case:
> When creating several PCollections to perform distinct reads with the same schema, you might create one RowCoder.of(schema) before creating the list of PCollections / PCollectionsList. However, once the pipeline begins and rows arrive for encoding, these pipelines will simultaneously try to cache a delegate coder for the row's schema.
> h3. Workaround:
> You can force the eager caching of the code by exercising encode in the main application before creating PCollections using the RowCoder:
> {code:java}
> try {
> myRowCoder.encode(null, null);
> } catch (IOException | NullPointerException e) {
> // do nothing
> }
> {code}
> h3. Context:
> I've only encountered this during development with the direct runner.
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