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https://issues.apache.org/jira/browse/HADOOP-14204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka updated HADOOP-14204:
-----------------------------------
    Fix Version/s: 2.9.0

> S3A multipart commit failing, "UnsupportedOperationException at 
> java.util.Collections$UnmodifiableList.sort"
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14204
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14204
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Critical
>             Fix For: 2.9.0, 2.8.1, 3.0.0-alpha4
>
>         Attachments: HADOOP-14204-branch-2.8-001.patch
>
>
> Stack trace seen trying to commit a multipart upload, as the EMR code (which 
> takes a {{List<String> etags}} is trying to sort that list directly, which it 
> can't do if the list doesn't want to be sorted.
> later versions of the SDK clone the list before sorting.
> We need to make sure that the list passed in can be sorted.



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