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https://issues.apache.org/jira/browse/HADOOP-18633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692038#comment-17692038
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ASF GitHub Bot commented on HADOOP-18633:
-----------------------------------------
mehakmeet merged PR #5422:
URL: https://github.com/apache/hadoop/pull/5422
> fix test AbstractContractDistCpTest#testDistCpUpdateCheckFileSkip
> ------------------------------------------------------------------
>
> Key: HADOOP-18633
> URL: https://issues.apache.org/jira/browse/HADOOP-18633
> Project: Hadoop Common
> Issue Type: Bug
> Components: tools/distcp
> Reporter: Mehakmeet Singh
> Assignee: Mehakmeet Singh
> Priority: Major
> Labels: pull-request-available
>
> In the newly introduced test testDistCpUpdateCheckFileSkip, for the first
> pass of "distcp -update", target file should not be present so that the copy
> takes place and creates the target file.
> Currently, we create both the source and target file with same block size
> from the start which can lead to flakiness due to race condition causing the
> modification time of the target file to be greater than/equal to the source
> and not copy the file at all. This can be seen more in the
> TestLocalContractDistCp due to no remote calls to create the target.
> {code:java}
> java.lang.AssertionError: Mismatch in COPY counter value expected:<1> but
> was:<0>
> at org.junit.Assert.fail(Assert.java:89)
> at org.junit.Assert.failNotEquals(Assert.java:835)
> at org.junit.Assert.assertEquals(Assert.java:647)
> at
> org.apache.hadoop.tools.contract.AbstractContractDistCpTest.verifySkipAndCopyCounter(AbstractContractDistCpTest.java:1000)
> at
> org.apache.hadoop.tools.contract.AbstractContractDistCpTest.testDistCpUpdateCheckFileSkip(AbstractContractDistCpTest.java:919)
> {code}
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