[
https://issues.apache.org/jira/browse/HIVE-25971?focusedWorklogId=732156&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-732156
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ASF GitHub Bot logged work on HIVE-25971:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Feb/22 07:33
Start Date: 24/Feb/22 07:33
Worklog Time Spent: 10m
Work Description: guptashailesh92 commented on pull request #3046:
URL: https://github.com/apache/hive/pull/3046#issuecomment-1049572142
In
[CacheThreadPool](https://github.com/apache/hive/blob/7b7e8d4d7910b9b6dc2fe498a6a4228c628853c1/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/ObjectCache.java#L59),
corePoolSize is zero so the other condition is always true, leading `timed`
variable to be true. Thats why it's doing `workQueue.poll`.
Created a sample
[code](https://gist.github.com/guptashailesh92/fb50644db431f24fa842bf24cd3e172d),
and was able to see the delay.
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Issue Time Tracking
-------------------
Worklog Id: (was: 732156)
Time Spent: 50m (was: 40m)
> Tez task shutdown getting delayed due to cached thread pool not closed
> ----------------------------------------------------------------------
>
> Key: HIVE-25971
> URL: https://issues.apache.org/jira/browse/HIVE-25971
> Project: Hive
> Issue Type: Improvement
> Components: Tez
> Affects Versions: 2.4.0, 3.1.2
> Reporter: Shailesh Gupta
> Assignee: Shailesh Gupta
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> We are using
> a[CachedThreadPool|https://github.com/apache/hive/blob/branch-2.3/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/ObjectCache.java]
> but not closing it. CachedThreadPool creates non daemon threads, causing the
> Tez Task JVM shutdown delayed upto 1 min, as default idle timeout is 1 min.
>
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