[jira] [Commented] (BEAM-573) TextIO.read() should support sharding

["Daniel Halperin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431156#comment-15431156 ] 

Daniel Halperin commented on BEAM-573:
--------------------------------------

I think this is working-as-intended. It is an important part of the model that the runner decides input sharding. Runners can ask input sources their size, and they *should* set the {{desiredBundleSizeBytes}} to a reasonable value if they cannot scale.

(I believe that the {{DirectRunner}} does not do this today, but that is also working as intended. It's not a scalable performance runner but rather a model-checking runner, which is also designed to not be horribly slow)

> TextIO.read() should support sharding
> -------------------------------------
>
>                 Key: BEAM-573
>                 URL: https://issues.apache.org/jira/browse/BEAM-573
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-extensions
>    Affects Versions: 0.1.0-incubating, 0.2.0-incubating
>            Reporter: Jean-Baptiste Onofré
>            Assignee: Jean-Baptiste Onofré
>             Fix For: Not applicable
>
>
> Currently, TextIO supports sharding (or {{withoutSharding()}} option) only in {{Write}}.
> I think it makes sense to also supports sharding on the {{Read}} behaving like:
> read the input in chunks of n MB (to avoid heap OutOfMemory with large files).



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