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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12373) Provide a command to list visibility labels
Date Wed, 19 Nov 2014 01:17:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217202#comment-14217202

Andrew Purtell commented on HBASE-12373:

+1 in general for the change for 0.98 (if you are planning a 0.98 patch [~jerryhe]), this
patch only adds new APIs in VisibilityClient and a new shell command. 

Comments on the patch:

Is it safe to assume the labels table will always only have one region? 

Related, have you given any thought to the many thousands of labels use case? (Or [~busbey]
was challenging us to think (eventually) of millions of labels.)

Would it be wise to marshall up ~thousands of results in one ListLabelsResponse? Probably
not, that would be a fat RPC. Also, the shell command would only be useful then with an optional
parameter supplying a regex expected to bound the result set to a reasonable amount. I think
these considerations suggest instead doing a scan over the labels table directly from code
in VisibilityClient. I realize this makes indirection through the visibility label service
more "interesting". The service impl would need to supply a client piece for listing labels.

> Provide a command to list visibility labels
> -------------------------------------------
>                 Key: HBASE-12373
>                 URL: https://issues.apache.org/jira/browse/HBASE-12373
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.98.7, 0.99.1
>            Reporter: Jerry He
>            Assignee: Jerry He
>            Priority: Minor
>             Fix For: 0.98.9, 0.99.2
>         Attachments: HBASE-12373-master-v2.patch, HBASE-12373-master-v3.patch, HBASE-12373-master.patch
> A command to list visibility labels that are in place would be handy.
> This is also in line with many of the other hbase list commands.

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