[jira] [Created] (HDFS-10383) Safely close resources in DFSTestUtil

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HDFS-10383:
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             Summary: 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


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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