Vojtech Janota created BEAM-4750:
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Summary: Beam performance degraded significantly since 2.4
Key: BEAM-4750
URL: https://issues.apache.org/jira/browse/BEAM-4750
Project: Beam
Issue Type: Bug
Components: runner-core
Affects Versions: 2.5.0, 2.4.0
Reporter: Vojtech Janota
Assignee: Kenneth Knowles
Starting from Beam 2.4 onwards the *InMemoryStateInternals* class in the
*beam-runners-core-java* module does an expensive Coder encode/decode operation
when copying object state. This has significant impact on performance and
pipelines that previously took low minutes do not finish within hours in our
case. Based on the discussion on the dev mailing list, the main motivation for
this change was to enforce Coder sanity, something that should arguably remain
within the realm of the DirectRunner and should not leak into the core layer.
Links to commits that introduced the new behaviour:
* [https://github.com/apache/beam/commit/32a427c]
* [https://github.com/apache/beam/commit/8151d82]
Additional details and surrounding discussion can be found here:
*
https://lists.apache.org/thread.html/1e329318a4dafe27b9ff304d9460d05d8966e5ceebaf4ebfb948e2b8@%3Cdev.beam.apache.org%3E
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