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https://issues.apache.org/jira/browse/HADOOP-13801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15644988#comment-15644988
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Steve Loughran commented on HADOOP-13801:
-----------------------------------------
This looks suspiciously to me like the test is getting back the byte array from
a serialized writeable stream, but expecting results split by lines and tabs,
so the tokenizer is failing. No obvious changes in the wordcount example or the
test though
> regression: ITestS3AMiniYarnCluster failing
> -------------------------------------------
>
> Key: HADOOP-13801
> URL: https://issues.apache.org/jira/browse/HADOOP-13801
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.9.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
>
> {{ITestS3AMiniYarnCluster}} is failing with an
> {{ArrayIndexOutOfBoundsException}} splitting up the output of the wordcount
> app. It's not getting word\t\count lines back.
> * git bisect points at commit 67e01f7; HADOOP-13614. Purge some
> superfluous/obsolete S3 FS tests that are slowing test runs down
> * problem exists when running standalone as well as in mvn parallel tests;
> this implies it's not parallelisation
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