[jira] [Commented] (HDFS-9349) Reconfigure NN protected directories on the fly

[Mingliang Liu (JIRA)]

    [ 
https://issues.apache.org/jira/browse/HDFS-9349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14999523#comment-14999523
 ] 

Mingliang Liu commented on HDFS-9349:
-------------------------------------

Thanks for working on this, [~xiaobingo].

Is it possible to eliminate the {{new TreeSet()}} when re-configurate the 
protected directories? Plus, {{setProtectedDirectoriesToDefault()}} seems not 
needed as {{StringUtils.getTrimmedStringCollection()}} accepts null value.

{code}
private final SortedSet<String> protectedDirectories;
  ....
void setProtectedDirectories(String dirString) {
  protectedDirRWL.writeLock().lock();
  try {
    protectedDirectories.clear();
    protectedDirectories.addAll(normalizePaths(
        StringUtils.getTrimmedStringCollection(dirString),
        FS_PROTECTED_DIRECTORIES));
  } finally {
    protectedDirRWL.writeLock().unlock();
  }
}
{code}

> Reconfigure NN protected directories on the fly
> -----------------------------------------------
>
>                 Key: HDFS-9349
>                 URL: https://issues.apache.org/jira/browse/HDFS-9349
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-9349.001.patch
>
>
> This is to reconfigure
> {code}
> fs.protected.directories
> {code}
> without restarting NN.



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