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https://issues.apache.org/jira/browse/HADOOP-16255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16921593#comment-16921593
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Steve Loughran commented on HADOOP-16255:
-----------------------------------------
2.x clients should all be able to talk to 3.x clusters, if not -complain. The
biggest troublespot is invariably live upgrades of HDFS clusters. Spark does
not have to worry about that directly....
> ChecksumFS.Make FileSystem.rename(path, path, options) doesn't rename checksum
> ------------------------------------------------------------------------------
>
> Key: HADOOP-16255
> URL: https://issues.apache.org/jira/browse/HADOOP-16255
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.8.5, 3.1.2
> Reporter: Steve Loughran
> Assignee: Jungtaek Lim
> Priority: Major
>
> ChecksumFS doesn't override FilterFS rename/3, so doesn't rename the checksum
> with the file.
> As a result, if a file is renamed over an existing file using rename(src,
> dest, OVERWRITE) the renamed file will be considered to have an invalid
> checksum -the old one is picked up instead.
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