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https://issues.apache.org/jira/browse/HDFS-12882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277238#comment-16277238
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Chris Douglas commented on HDFS-12882:
--------------------------------------

Sorry, should clarify:
bq. New clients talking to old servers will get errors because the location 
field was ignored.
New clients invoking new APIs on old servers will get errors (and not undefined 
behavior). All existing APIs are unchanged.

> Support full open(PathHandle) contract in HDFS
> ----------------------------------------------
>
>                 Key: HDFS-12882
>                 URL: https://issues.apache.org/jira/browse/HDFS-12882
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Chris Douglas
>            Assignee: Chris Douglas
>         Attachments: HDFS-12882.00.patch, HDFS-12882.00.salient.txt, 
> HDFS-12882.01.patch
>
>
> HDFS-7878 added support for {{open(PathHandle)}}, but it only partially 
> implemented the semantics specified in the contract (i.e., open-by-inodeID). 
> HDFS should implement all permutations of the default options for 
> {{PathHandle}}.



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