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https://issues.apache.org/jira/browse/BEAM-771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586181#comment-15586181
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ASF GitHub Bot commented on BEAM-771:
-
GitHub user tgroh opened a pull request:
https://github.com/apache/incubator-beam/pull/1128
[BEAM-771] Add a Residual Shard for Empty Readers
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---
When the UnboundedReadEvaluator starts, it checks to see if the reader
has any elements available. If not, it immediately terminates (without
taking a new checkpoint). It should also ensure that the result contains
a residual shard that will continue to read from the shard, utilizing
the same reader if possible.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgroh/incubator-beam read_when_no_inputs
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-beam/pull/1128.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 #1128
commit 87f26972c02bb7640c1eee5069ad842a4a3ab1a0
Author: Thomas Groh
Date: 2016-10-18T17:57:53Z
Add a Residual Shard for Empty Readers
When the UnboundedReadEvaluator starts, it checks to see if the reader
has any elements available. If not, it immediately terminates (without
taking a new checkpoint). It should also ensure that the result contains
a residual shard that will continue to read from the shard, utilizing
the same reader if possible.
> UnboundedReadEvaluator should reuse the input reader if it contains no
> elements
> ---
>
> Key: BEAM-771
> URL: https://issues.apache.org/jira/browse/BEAM-771
> Project: Beam
> Issue Type: Bug
>Reporter: Thomas Groh
>Assignee: Thomas Groh
>
> The UnboundedReadEvaluator checks, after it obtains the reader, that the
> reader contains elements, and terminates without taking a new checkpoint if
> not. It must also (but currently does not) add that reader and shard back as
> a residual element.
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