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https://issues.apache.org/jira/browse/BEAM-7131?focusedWorklogId=240534&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-240534
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ASF GitHub Bot logged work on BEAM-7131:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/May/19 01:44
Start Date: 11/May/19 01:44
Worklog Time Spent: 10m
Work Description: ibzib commented on pull request #8558: [BEAM-7131]
cache executable stage output to prevent re-computation
URL: https://github.com/apache/beam/pull/8558
When an executable stage has more than one consumer, it results in the
executable stage being re-computed for each extra consumer. This behavior is
undesirable because we are potentially fusing a large amount of work into some
executable stages, in addition to thorny problems like side effects (see the
[Jira](https://issues.apache.org/jira/browse/BEAM-7131)) which, though not
generally encouraged, should not be breaking things so consistently and
opaquely.
R: @robertwb @angoenka
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Issue Time Tracking
-------------------
Worklog Id: (was: 240534)
Time Spent: 10m
Remaining Estimate: 0h
> Spark portable runner appears to be repeating work (in TFX example)
> -------------------------------------------------------------------
>
> Key: BEAM-7131
> URL: https://issues.apache.org/jira/browse/BEAM-7131
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Kyle Weaver
> Assignee: Kyle Weaver
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I've been trying to run the TFX Chicago taxi example [1] on the Spark
> portable runner. TFDV works fine, but the preprocess step
> (preprocess_flink.sh [2]) fails with the following error:
> RuntimeError: AlreadyExistsError: file already exists [while running
> 'WriteTransformFn/WriteTransformFn']
> Assets are being written multiple times to different temp directories, which
> is okay, but the error occurs when they are copied to the same permanent
> output directory. Specifically, the copy tree operation in transform_fn_io.py
> [3] is run twice with the same output directory. The error doesn't occur when
> that code is modified to allow overwriting existing files, but that's only a
> shallow fix. While the TF transform should probably be made idempotent, this
> is also an issue with the Spark runner, which shouldn't be repeating work
> like this regularly (in the absence of a failure condition).
> [1] [https://github.com/tensorflow/tfx/tree/master/tfx/examples/chicago_taxi]
> [2]
> [https://github.com/tensorflow/tfx/blob/master/tfx/examples/chicago_taxi/preprocess_flink.sh]
> [3]
> [https://github.com/tensorflow/transform/blob/master/tensorflow_transform/beam/tft_beam_io/transform_fn_io.py#L33-L45]
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