[
https://issues.apache.org/jira/browse/BEAM-10260?focusedWorklogId=445896&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-445896
]
ASF GitHub Bot logged work on BEAM-10260:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Jun/20 15:31
Start Date: 15/Jun/20 15:31
Worklog Time Spent: 10m
Work Description: mxm opened a new pull request #12012:
URL: https://github.com/apache/beam/pull/12012
The continuation mode was always-on by mistake. Also, continuation mode would
arbitrarily nest appended state via iterators which would lead to the
following
error:
```
RecursionError: maximum recursion depth exceeded while calling a Python
object
```
In case of continuations tokens, we do not cache anything anymore after the
continuation. Caching after the continuation token would defeat the purpose
of
using continuation tokens for large state. A test was added for continuation
tokens.
The extend operation was removed from the statecache in favor of using only
put/get/clear which avoids any race conditions with the cache eviction.
Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
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--- | --- | --- | --- | --- | --- | ---
Go | [](https://builds.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/)
| --- | --- | [](https://builds.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/)
| --- | [](https://builds.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/)
Java | [](https://builds.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Apex/lastCompletedBuild/)
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| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/)
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| --- | [](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
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| --- | [](https://builds.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/)
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| --- | --- | [](https://builds.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/)
Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
--- |Java | Python | Go | Website
--- | --- | --- | --- | ---
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| --- | ---
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Issue Time Tracking
-------------------
Worklog Id: (was: 445896)
Remaining Estimate: 0h
Time Spent: 10m
> Nested iterable in state cache exceeds Python recursion limit
> -------------------------------------------------------------
>
> Key: BEAM-10260
> URL: https://issues.apache.org/jira/browse/BEAM-10260
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-harness
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> With state caching enabled, the changes in BEAM-8298 lead to an unbounded
> nesting of state iterables when appending to a bag state, quickly resulting
> in an exception:
> {noformat}
> events = list(event_bag.read())
> File
> "/code/venvs/venv/lib/python3.6/site-packages/apache_beam/runners/worker/bundle_processor.py",
> line 488, in __iter__ for elem in self.first:
> File
> "/code/venvs/venv/lib/python3.6/site-packages/apache_beam/runners/worker/statecache.py",
> line 186, in __iter__ for item in value:
> File
> "/code/venvs/venv/lib/python3.6/site-packages/apache_beam/runners/worker/statecache.py",
> line 186, in __iter__ for item in value:
> File
> "/code/venvs/venv/lib/python3.6/site-packages/apache_beam/runners/worker/statecache.py",
> line 186, in __iter__ for item in value: [Previous line repeated 977
> more times]
> RecursionError: maximum recursion depth exceeded while calling a Python
> object
> {noformat}
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