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https://issues.apache.org/jira/browse/HADOOP-18781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17737126#comment-17737126
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ASF GitHub Bot commented on HADOOP-18781:
-----------------------------------------
mehakmeet opened a new pull request, #5780:
URL: https://github.com/apache/hadoop/pull/5780
### Description of PR
Applications using AzureBlobFileSystem to create the AbfsOutputStream can
use the AbfsOutputStream for the purpose of writing, however, the OutputStream
doesn't hold any reference to the fs instance that created it, which can make
the FS instance eligible for GC, when this occurs, AzureblobFileSystem's
`finalize()` method gets called which in turn closes the FS, and in turn call
the close for AzureBlobFileSystemStore, which uses the same Threadpool that is
used by the AbfsOutputStream. This leads to the closing of the thread pool
while the writing is happening in the background and leads to hanging while
writing.
### How was this patch tested?
`mvn -Dparallel-tests=abfs -DtestsThreadCount=8 -Dscale clean verify` on
`us-west-2`
```
[INFO]
[INFO] Tests run: 141, Failures: 0, Errors: 0, Skipped: 4
```
```
[INFO]
[ERROR] Tests run: 582, Failures: 5, Errors: 1, Skipped: 107
Seeing "lease" related errors, seems to be my bucket related(have seen the
same in trunk for me too, so unrelated).
```
```
[ERROR] Failures:
[ERROR]
ITestAbfsReadWriteAndSeek.testReadAndWriteWithDifferentBufferSizesAndSeek:78->testReadWriteAndSeek:111
[Retry was required due to issue on server side] expected:<[0]> but was:<[1]>
[INFO]
[ERROR] Tests run: 339, Failures: 1, Errors: 0, Skipped: 41
Seeing this in the trunk as well, not so sure about this.
```
### For code changes:
- [ ] 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?
> ABFS Output stream thread pools getting shutdown during GC.
> -----------------------------------------------------------
>
> Key: HADOOP-18781
> URL: https://issues.apache.org/jira/browse/HADOOP-18781
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Reporter: Mehakmeet Singh
> Assignee: Mehakmeet Singh
> Priority: Major
>
> Applications using AzureBlobFileSystem to create the AbfsOutputStream can use
> the AbfsOutputStream for the purpose of writing, however, the OutputStream
> doesn't hold any reference to the fs instance that created it, which can make
> the FS instance eligible for GC, when this occurs, AzureblobFileSystem's
> `finalize()` method gets called which in turn closes the FS, and in turn call
> the close for AzureBlobFileSystemStore, which uses the same Threadpool that
> is used by the AbfsOutputStream. This leads to the closing of the thread pool
> while the writing is happening in the background and leads to hanging while
> writing.
>
> *Solution:*
> Pass a backreference of AzureBlobFileSystem into AzureBlobFileSystemStore and
> AbfsOutputStream as well.
>
> Same should be done for AbfsInputStream as well.
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