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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/07/22 22:33:05 UTC
[GitHub] [beam] mxm opened a new pull request #12345: [BEAM-10558] Flushing of buffered elements during checkpoint can stall
mxm opened a new pull request #12345:
URL: https://github.com/apache/beam/pull/12345
Elements are buffered during `DoFnOperator#snapshotState`, called as part of a
Flink checkpoint. This is necessary because flushing out elements in this method
call would alter the checkpoint barrier alignment. Optionally, elements can be
flushed out before the method call via the `finishBundleBeforeCheckpointing`
option which is turned off by default because it can affect the checkpoint
duration.
The buffer is flushed as part of starting a new bundle. A problem arises if no
new bundle will be started. For example, this can be the case if only a single
element (e.g. Impulse) is produced as part of a bundle during checkpointing.
Afterwards, when no bundle will be started due to another element arriving,
or a timer firing, the element will not be flushed from the buffer.
Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
Lang | SDK | Dataflow | Flink | Samza | Spark | Twister2
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Go | [](https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/) | --- | [](https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/) | --- | [](https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/) | ---
Java | [](https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/) | [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/)
Python | [](https://ci-beam.apache.org/job/beam_PostCommit_Python2/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python35/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PreCommit_Python2_PVR_Flink_Cron/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python35_VR_Flink/lastCompletedBuild/) | --- | [](https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/) | ---
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Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
--- |Java | Python | Go | Website
--- | --- | --- | --- | ---
Non-portable | [](https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/) | [](https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/)
Portable | --- | [](https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/) | --- | ---
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[GitHub] [beam] mxm merged pull request #12345: [BEAM-10558] Flushing of buffered elements during checkpoint can stall
Posted by GitBox <gi...@apache.org>.
mxm merged pull request #12345:
URL: https://github.com/apache/beam/pull/12345
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