[
https://issues.apache.org/jira/browse/HIVE-25971?focusedWorklogId=731491&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-731491
]
ASF GitHub Bot logged work on HIVE-25971:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Feb/22 10:21
Start Date: 23/Feb/22 10:21
Worklog Time Spent: 10m
Work Description: guptashailesh92 opened a new pull request #3046:
URL: https://github.com/apache/hive/pull/3046
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We are closing the cached thread pool which is delaying the tez task jvm
shutdown.
The pool is used for loading [hash
table](https://github.com/apache/hive/blob/7b7e8d4d7910b9b6dc2fe498a6a4228c628853c1/ql/src/java/org/apache/hadoop/hive/ql/exec/MapJoinOperator.java#L180)
in case of mapjoin operator.
### Why are the changes needed?
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Without the change, tez task jvm takes upto 1 min to shutdown.
### Does this PR introduce _any_ user-facing change?
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No
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Monitored the JVM exit time.
`2022-02-03 16:47:54,432 [INFO] [main] |util.Debug|: Hook: class
org.apache.hadoop.hive.ql.exec.tez.ObjectCache$2
2022-02-03 16:48:04,079 [DEBUG] [Thread-4] |util.ShutdownHookManager|:
Completed shutdown in 0.001 seconds; Timeouts: 0
2022-02-03 16:48:04,088 [DEBUG] [Thread-4] |util.ShutdownHookManager|:
ShutdownHookManger completed shutdown.
`
`2022-02-03 17:04:05,491 [INFO] [main] |util.Debug|: Hook:
org.apache.hadoop.hive.ql.exec.tez.ObjectCache$2@67fa5445
2022-02-03 17:04:05,508 [DEBUG] [Thread-4] |util.ShutdownHookManager|:
Completed shutdown in 0.014 seconds; Timeouts: 0
2022-02-03 17:04:05,523 [DEBUG] [Thread-4] |util.ShutdownHookManager|:
ShutdownHookManger completed shutdown.`
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Issue Time Tracking
-------------------
Worklog Id: (was: 731491)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 10m
> 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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