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Posted to issues@spark.apache.org by "Josh Rosen (Jira)" <ji...@apache.org> on 2023/01/27 06:49:00 UTC
[jira] [Assigned] (SPARK-42205) Remove logging of Accumulables in Task/Stage start events in JsonProtocol
[ https://issues.apache.org/jira/browse/SPARK-42205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Josh Rosen reassigned SPARK-42205:
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Assignee: Josh Rosen
> Remove logging of Accumulables in Task/Stage start events in JsonProtocol
> -------------------------------------------------------------------------
>
> Key: SPARK-42205
> URL: https://issues.apache.org/jira/browse/SPARK-42205
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Major
>
> Spark's JsonProtocol event logs (used by the history server) are impacted by a race condition when tasks / stages finish very quickly:
> The SparkListenerTaskStart and SparkListenerStageSubmitted events contain mutable TaskInfo and StageInfo objects, which in turn contain Accumulables fields. When a task or stage is submitted, Accumulables is initially empty. When the task or stage finishes, this field is updated with values from the task.
> If a task or stage finishes before the start event has been logged by the event logging listener then the _start_ event will contain the Accumulable values from the task or stage _end_ event.
> This information isn't used by the History Server and contributes to wasteful bloat in event log sizes. In one real-world log, I found that ~10% of the uncompressed log size was due to these redundant Accumulable fields.
> I propose that we update JsonProtocol to skip the logging of this field for Start/Submitted events.
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