GitHub user tgroh opened a pull request:
https://github.com/apache/beam/pull/1941
Inject number of Shards as a Side Input to Write
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This permits users to pass a PTransform from the input elements to the
number of shards instead of requiring a constant amount. This enables
sharding to be determined based on the input data rather than a constant
value.
This can also convert the DirectRunner to inject a custom sharding
strategy in its override, rather than relying on bundling behavior.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgroh/beam write_inject_sharding
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/1941.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 #1941
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commit 3f60decfe12ffee2f1d22982b7d696dd86edb7b5
Author: Thomas Groh <tg...@google.com>
Date: 2017-02-07T23:16:19Z
Inject number of Shards as a Side Input to Write
This permits users to pass a PTransform from the input elements to the
number of shards instead of requiring a constant amount. This enables
sharding to be determined based on the input data rather than a constant
value.
Tests still should be written. This can also convert the DirectRunner to
inject a custom sharding strategy in its override, rather than relying
on custom bundling.
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