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https://issues.apache.org/jira/browse/HDFS-7081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145652#comment-14145652
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Tsz Wo Nicholas Sze commented on HDFS-7081:
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{quote}
diff: I'm not sure what a "list difference" is, but it's not a set difference
since it doesn't handle duplicates. Update javadoc about the expectations?
{quote}
Hi [~andrew.wang], I think the meaning of "list difference" is straight-forward
but sorry that it isn't for you. You may want to do a web search and it is
easy to find an explanation such as
http://stackoverflow.com/questions/6486450/python-compute-list-difference .
> Add new DistributedFileSystem API for getting all the existing storage
> policies
> -------------------------------------------------------------------------------
>
> Key: HDFS-7081
> URL: https://issues.apache.org/jira/browse/HDFS-7081
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer, namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-7081.000.patch, HDFS-7081.001.patch,
> HDFS-7081.002.patch, HDFS-7081.003.patch
>
>
> Instead of loading all the policies from a client side configuration file, it
> may be better to provide Mover with a new RPC call for getting all the
> storage policies from the namenode.
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