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https://issues.apache.org/jira/browse/HDFS-10383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15289732#comment-15289732
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Mingliang Liu commented on HDFS-10383:
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Thanks [~xyao] for your review and commit. Thanks [~walter.k.su] and
[~arpitagarwal] for the review and discussion.
> Safely close resources in DFSTestUtil
> -------------------------------------
>
> Key: HDFS-10383
> URL: https://issues.apache.org/jira/browse/HDFS-10383
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: test
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.8.0
>
> Attachments: HDFS-10383-branch-2.000.patch, HDFS-10383.000.patch,
> HDFS-10383.001.patch, HDFS-10383.002.patch, HDFS-10383.003.patch
>
>
> There are a few of methods in {{DFSTestUtil}} that do not close the resource
> safely, or elegantly. We can use the try-with-resource statement to address
> this problem.
> Specially, as {{DFSTestUtil}} is popularly used in test, we need to preserve
> any exceptions thrown during the processing of the resource while still
> guaranteeing it's closed finally. Take for example,the current implementation
> of {{DFSTestUtil#createFile()}} closes the FSDataOutputStream in the
> {{finally}} block, and when closing if the internal
> {{DFSOutputStream#close()}} throws any exception, which it often does, the
> exception thrown during the processing will be lost. See this [test
> failure|https://builds.apache.org/job/PreCommit-HADOOP-Build/9320/testReport/org.apache.hadoop.hdfs/TestAsyncDFSRename/testAggressiveConcurrentAsyncRenameWithOverwrite/],
> and we have to guess what was the root cause.
> Using try-with-resource, we can close the resources safely, and the
> exceptions thrown both in processing and closing will be available (closing
> exception will be suppressed). Besides the try-with-resource, if a stream is
> not necessary, don't create/close it.
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