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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (BEAM-38) Avoid repeated DoFn deserialization
Date Tue, 07 Jun 2016 22:09:21 GMT


ASF GitHub Bot commented on BEAM-38:

GitHub user tgroh opened a pull request:

    [BEAM-38] Reset Writer in WriteBundles.finishBundle

    Be sure to do all of the following to help us incorporate your contribution
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     - [ ] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
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    This allows the WriteBundles DoFn to be reused.

You can merge this pull request into a Git repository by running:

    $ git pull reset_write_bundles_state

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #429
commit 41a3ec65fc2f6465b58b1f5bc768276788c71978
Author: Thomas Groh <>
Date:   2016-06-07T21:52:20Z

    Reset Writer in WriteBundles.finishBundle
    This allows the WriteBundles DoFn to be reused.


> Avoid repeated DoFn deserialization
> -----------------------------------
>                 Key: BEAM-38
>                 URL:
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model
>            Reporter: Kenneth Knowles
>            Assignee: Thomas Groh
> Alluded to in our technical vision, we wish to remove at least some guarantees about
when a fresh DoFn instance is created. Repeated deserialization can become a major cost when
bundles are very small, as in some streaming pipelines.

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