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https://issues.apache.org/jira/browse/BEAM-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095589#comment-16095589
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ASF GitHub Bot commented on BEAM-2628:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/3590
> AvroSource.split() sequentially opens every matched file
> --------------------------------------------------------
>
> Key: BEAM-2628
> URL: https://issues.apache.org/jira/browse/BEAM-2628
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Eugene Kirpichov
> Assignee: Eugene Kirpichov
> Fix For: 2.2.0
>
>
> When you do AvroIO.read().from(filepattern), during splitting of AvroSource
> the filepattern gets expanded into N files, and then for each of the N files
> we do this:
> https://github.com/apache/beam/blob/v2.0.0/sdks/java/core/src/main/java/org/apache/beam/sdk/io/AvroSource.java#L259
> This is very slow. E.g. one job was reading 15,000 files, and it took almost
> 2 hours to split the source because opening each file and reading schema was
> taking about 0.5s.
> I'm not quite sure why we need the file metadata while splitting...
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