saintstack opened a new pull request, #4346:
URL: https://github.com/apache/hadoop/pull/4346
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### Description of PR
Remove the ThreadGroup used by executor factories; they are unused
and ThreadGroups auto-destroy when their Thread-member count goes to
zero.
This behavior is incompatible with the configuration we have on the
per-volume
executor which is set to let all threads die if no use inside the
keepalive time.
Backport from trunk.
### How was this patch tested?
By running a downstream test that was broken w/o this PR
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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