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https://issues.apache.org/jira/browse/BEAM-2643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105992#comment-16105992
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ASF GitHub Bot commented on BEAM-2643:
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GitHub user chamikaramj opened a pull request:
https://github.com/apache/beam/pull/3661
[BEAM-2643] Adds two new Read PTransforms that can be used to read a
massive number of files
textio.ReadAllFromText is for reading a PCollection of text files/file
patterns.
avroio.ReadAllFromAvro is for reading a PCollection of Avro files/file
patterns.
Most of the logic was generalized to a new PTransform
filebasedsource.ReadAllFiles so that other file-based sources can be easily
adapted to follow the same pattern.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chamikaramj/beam fileio_read_all
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/3661.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3661
----
commit 5174e48a3e3ac495d452f438be916b3046ed1cf4
Author: [email protected] <[email protected]>
Date: 2017-07-29T02:39:02Z
Adds two new Read PTransforms that can be used to read a massive number of
files.
textio.ReadAllFromText is for reading a PCollection of text files/file
patterns.
avroio.ReadAllFromAvro is for reading a PCollection of Avro files/file
patterns.
----
> Add TextIO and AvroIO read transforms that can read a PCollection of files
> --------------------------------------------------------------------------
>
> Key: BEAM-2643
> URL: https://issues.apache.org/jira/browse/BEAM-2643
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py
> Reporter: Chamikara Jayalath
> Assignee: Chamikara Jayalath
>
> Java SDK now has TextIO.read_all() API that allows reading a massive number
> of files by moving from using the BoundedSource API (which may perform
> expensive source operations on the control plane) to using ParDo operations.
> https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/TextIO.java#L170
> This API should be added for Python SDK as well.
> This form of reading files does not support dynamic work rebalancing for now.
> But this should not matter much when reading a massive number of relatively
> small files. In the future this API can support dynamic work rebalancing
> through Splittable DoFn.
> cc: [~jkff]
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