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https://issues.apache.org/jira/browse/HADOOP-18781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17737127#comment-17737127
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ASF GitHub Bot commented on HADOOP-18781:
-----------------------------------------
mehakmeet commented on PR #5780:
URL: https://github.com/apache/hadoop/pull/5780#issuecomment-1607373617
CC: @steveloughran @mukund-thakur Cannot think of another test other than
checking if the correct fs instance is passed. But I did have a test in my
local where I tried to explicitly run a `System.gc()`(Which actually doesn't
run the GC, just points if there is something to collect) which resulted in
`finalize()` getting called on the FS after applying the patch, fs instance
wasn't getting GC'ed and thread pool was not closed for writing.
> 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
> Labels: pull-request-available
>
> 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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