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https://issues.apache.org/jira/browse/BEAM-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947589#comment-15947589
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Konstantinos Katsiapis commented on BEAM-778:
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In general the Beam programming model usually requires thread-compatibility
(not the stronger thread-safety). I would hazard a guess that we should follow
suite for _CompressedFile (ie no need for locking?). Having said that it might
be worth documenting the thread-compatibility but [~chamikara] or [~altay]
would have a better sense about overall documentation etc.
> Make fileio._CompressedFile seekable.
> -------------------------------------
>
> Key: BEAM-778
> URL: https://issues.apache.org/jira/browse/BEAM-778
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py
> Reporter: Chamikara Jayalath
> Assignee: Tibor Kiss
> Fix For: Not applicable
>
>
> We have a TODO to make fileio._CompressedFile seekable.
> https://github.com/apache/incubator-beam/blob/python-sdk/sdks/python/apache_beam/io/fileio.py#L692
> Without this, compressed file objects produce for FileBasedSource
> implementations may not be able to use libraries that utilize methods seek()
> and tell().
> For example tarfile.open().
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