[SPARK-30556][SQL][2.4] Copy sparkContext.localproperties to child thread inSubqueryExec.executionContext #27340
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This is a backport of #27267 fix
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ok to test |
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Test build #117303 has finished for PR 27340 at commit
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dongjoon-hyun
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All tests passed. The R failure is a known incoming feasibility test flakiness. cc @viirya |
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Merged to branch-2.4. |
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Jan 23, 2020
…read inSubqueryExec.executionContext ### What changes were proposed in this pull request? In `org.apache.spark.sql.execution.SubqueryExec#relationFuture` make a copy of `org.apache.spark.SparkContext#localProperties` and pass it to the sub-execution thread in `org.apache.spark.sql.execution.SubqueryExec#executionContext` ### Why are the changes needed? 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 created in 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` ### Does this PR introduce any user-facing change? No ### How was this patch tested? Added UT Closes #27340 from ajithme/subquerylocalprop2. Authored-by: Ajith <[email protected]> Signed-off-by: Dongjoon Hyun <[email protected]>
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Thank you, @ajithme and @cloud-fan . |
dongjoon-hyun
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Jan 23, 2020
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What changes were proposed in this pull request?
In
org.apache.spark.sql.execution.SubqueryExec#relationFuturemake a copy oforg.apache.spark.SparkContext#localPropertiesand pass it to the sub-execution thread inorg.apache.spark.sql.execution.SubqueryExec#executionContextWhy are the changes needed?
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 thelocalPropertiesfromsparkContextas they are the child threads.These threads are created in 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/submitJobDoes this PR introduce any user-facing change?
No
How was this patch tested?
Added UT