[jira] [Updated] (HDFS-8860) Remove unused Replica copyOnWrite code

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-8860:
---------------------------------------
    Summary: Remove unused Replica copyOnWrite code  (was: Remove Replica hardlink / unlink code)

> Remove unused Replica copyOnWrite code
> --------------------------------------
>
>                 Key: HDFS-8860
>                 URL: https://issues.apache.org/jira/browse/HDFS-8860
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0, 2.8.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-8860.0.patch
>
>
> {{ReplicaInfo#unlinkBlock()}} is effectively disabled by the following code, because {{isUnlinked()}} always returns true.
> {code}
> if (isUnlinked()) {
>   return false;
> }
> {code}
> Several test cases, e.g., {{TestFileAppend#testCopyOnWrite}} and {{TestDatanodeRestart#testRecoverReplicas}} are testing against the unlink 
> Lets remove the relevant code to eliminate the confusions. 



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