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Mingliang Liu commented on HDFS-10383: -------------------------------------- Thanks [~arpitagarwal] for taking care of it. Sorry I still got no luck, even after log out and re-log in. > 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 > Attachments: 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org