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https://issues.apache.org/jira/browse/HDFS-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16412234#comment-16412234
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Gang Li commented on HDFS-13326:
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Hi, guys, currently the add and update functionalities are mixed in one
function. To better separate them and make them complete and clear, I have the
following thoughts about add, update and rm commands. So i am thinking add
command can only add new source or new name service. If both the source and
name service already exist, let it fail. Update command can only update
existing source. If the source does not exist, let it fail. Rm command can
remove a source or a name service.
For example,
add m1 ns1, ns2 /a
if m1 exists:
ns1 or ns2 exists: fail
else: add them
else: add them
update m1 ns1 /a
if m1 exists:
if ns1 exists: update the dest or other options
else: use 'ns1 /a' to overwrite m1's name services and destinations
else: fail
rm m1 ns2
if ns2 is provided, just remove ns2
if ns2 is not provided, remove m1
Please let me know how you think of them. Feel free to comment.
> RBF: Improve the interfaces to modify and view mount tables
> -----------------------------------------------------------
>
> Key: HDFS-13326
> URL: https://issues.apache.org/jira/browse/HDFS-13326
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Wei Yan
> Assignee: Gang Li
> Priority: Minor
>
> 1. From DFSRouterAdmin cmd, currently the update logic is implemented inside
> add operation, where it has some limitation (e.g. cannot update "readonly" or
> removing a destination). Given the RPC alreadys separate add and update
> operations, it would be better to do the same in cmd level.
> 2. Currently in the MountTable tab, the "readonly" field always show empty,
> no matter whether the mount entry is readonly or not. From the code
> perspective, it tries to show:
> {code:java}
> <td class="dfshealth-node-icon dfshealth-mount-read-only-{readonly}"/>{code}
> The federationhealth.html will load hadoop.css, however the hadoop.css
> doesn't have classes with a prefix "dfshealth-mount-read-only". This could be
> fixed in HDFS-13204.
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