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https://issues.apache.org/jira/browse/SPARK-30556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021418#comment-17021418
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Dongjoon Hyun edited comment on SPARK-30556 at 1/22/20 7:27 PM:
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Hi, [~ajithshetty].
This looks important. Could you check the older Spark versions like 2.3.x and
2.2.x, too?
was (Author: dongjoon):
Hi, [~ajithshetty].
Could you check the older Spark versions like 2.3.x and 2.2.x, too?
> SubqueryExec passes local properties to SubqueryExec.executionContext
> ---------------------------------------------------------------------
>
> Key: SPARK-30556
> URL: https://issues.apache.org/jira/browse/SPARK-30556
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.4, 3.0.0
> Reporter: Ajith S
> Priority: Major
>
> Local properties set via sparkContext are not available as TaskContext
> properties when executing jobs and threadpools have idle threads which are
> reused
> Explanation:
> When SubqueryExec, the {{relationFuture}} is evaluated via a separate thread.
> The threads inherit the {{localProperties}} from sparkContext as they are the
> child threads.
> These threads are controlled via the executionContext (thread pools). Each
> Thread pool has a default {{keepAliveSeconds}} of 60 seconds for idle threads.
> Scenarios where the thread pool has threads which are idle and reused for a
> subsequent new query, the thread local properties will not be inherited from
> spark context (thread properties are inherited only on thread creation) hence
> end up having old or no properties set. This will cause taskset properties to
> be missing when properties are transferred by child thread via
> {{sparkContext.runJob/submitJob}}
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