Lars George created HBASE-17391:
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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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