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https://issues.apache.org/jira/browse/HADOOP-3059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas resolved HADOOP-3059.
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Resolution: Won't Fix
HADOOP-2808 didn't introduce a new signature for copy; it enforced the existing
one. As indicated in the JIRA, setting the "overwrite" parameter had no effect
on the copy. This isn't an API change; the overwrite formal was added to a
private, static function. The former behavior can be restored by setting
overwrite to false.
> 0.16.1 breaks backwards API compatibility with fix for HADOOP-2808
> ------------------------------------------------------------------
>
> Key: HADOOP-3059
> URL: https://issues.apache.org/jira/browse/HADOOP-3059
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.1
> Reporter: Subramaniam Krishnan
> Fix For: 0.16.2
>
>
> HADOOP-2808 introduced a new signature for the copy method that takes an
> overwrite flag.
> Before this patch the behavior, for the pre-existing copy method, was that if
> the destination existed an IOException was thrown. After this patch the
> behavior, for the pre-existing copy method, is that if the destination exists
> it is overwritten.
> The behavior of the pre-existing copy method should not have changed.
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