[HBASE-17391] [Shell] Add shell command to get list of servers, with filters

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.3.0
• Fix Version/s: 3.0.0-beta-2
• Component/s: shell
• Labels: beginner
• Assignee: Sreeram Venkatasubramanian
• Reporter: Lars George
• Created: 29/Dec/16 15:45
• Updated: 16/Dec/23 09:52

Description

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:

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

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.