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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17391) [Shell] Add shell command to get list of servers, with filters
Date Thu, 29 Dec 2016 15:45:58 GMT
Lars George created HBASE-17391:
-----------------------------------

             Summary: [Shell] Add shell command to get list of servers, with filters
                 Key: HBASE-17391
                 URL: https://issues.apache.org/jira/browse/HBASE-17391
             Project: HBase
          Issue Type: Improvement
          Components: shell
    Affects Versions: 1.3.0
            Reporter: Lars George


For some operations, for example calling {{update_config}}, the user needs to specify the
full server name. For region servers that is easier to find, but not so much for the master
(using {{zk_dump}} works but is noisy). It woould be good to add a utility call that lists
the servers, preferably with an optional filter (a regexp, server type, or globbing style
format) that allows to whittle down the potentially long is of servers. For example:

{noformat}
hbase(main):001:0> list_servers "master"
master-1.internal.larsgeorge.com,16000,1483018890074

hbase(main):002:0> list_servers "rs"
slave-1.internal.larsgeorge.com,16020,1482996572051
slave-3.internal.larsgeorge.com,16020,1482996572481
slave-2.internal.larsgeorge.com,16020,1482996570909

hbase(main):003:0> list_servers "rs:s.*\.com.*"
slave-1.internal.larsgeorge.com,16020,1482996572051
slave-3.internal.larsgeorge.com,16020,1482996572481
slave-2.internal.larsgeorge.com,16020,1482996570909

hbase(main):004:0> list_servers ":.*160?0.*"
master-1.internal.larsgeorge.com,16000,1483018890074
slave-1.internal.larsgeorge.com,16020,1482996572051
slave-3.internal.larsgeorge.com,16020,1482996572481
slave-2.internal.larsgeorge.com,16020,1482996570909
{noformat}

I could imagine to have {{master}}, {{backup-master}}, {{rs}}, and maybe even {{zk}} too.
The optional regexp shown uses a colon as a divider. This combines the "by-type", and using
a filter. Example #4 skips the type and only is using the filter.

Of course, you could also implement this differently, say with two parameters... just suggesting.



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