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https://issues.apache.org/jira/browse/HDFS-10383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280847#comment-15280847
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Xiaoyu Yao commented on HDFS-10383:
-----------------------------------
Thanks [~liuml07] for working on this. The patch looks good to me overall. Just
few comments:
1. There are a few places where the FSDataOutputStream can be wrapped with
try-with-resource, e.g.,
runOperations/writeFile/appendFile/createStripedFile
2. getAllBlocks(FileSystem fs, Path path) can be wrapped with try-with-resource.
> Safely close resources in DFSTestUtil
> -------------------------------------
>
> Key: HDFS-10383
> URL: https://issues.apache.org/jira/browse/HDFS-10383
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Priority: Minor
> Attachments: HDFS-10383.000.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).
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