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https://issues.apache.org/jira/browse/HDFS-9089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14803332#comment-14803332
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Surendra Singh Lilhore commented on HDFS-9089:
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Thanks [~szetszwo] for comment.
The main purpose of this jira is to delete directory {{system}} which is
created by Mover and Balancer after completing task, but we can't delete
{{system}} directory directly because it may be created by user. We thought we
can use one reserve directory name like {{.system}}, so we can delete it after
completing mover and balancer task.
bq. This looks like an incompatible change.
I didn't get, how it is incompatible ?.
> Balancer and Mover should use ".system" as reserved inode name instead of
> "system"
> ----------------------------------------------------------------------------------
>
> Key: HDFS-9089
> URL: https://issues.apache.org/jira/browse/HDFS-9089
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Reporter: Archana T
> Assignee: Surendra Singh Lilhore
> Attachments: HDFS-9089.01.patch, HDFS-9089.02.patch
>
>
> Currently Balancer and Mover create "/system" for placing mover.id and
> balancer.id
> hdfs dfs -ls /
> drwxr-xr-x - root hadoop 0 2015-09-16 12:49
> {color:red}/system{color}
> This folder created in not deleted once mover or balancer work is completed
> So user cannot create dir "system" .
> Its better to make ".system" as reserved inode for balancer and mover instead
> of "system".
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