Add a method to get the zookeeper server version from the client
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Key: ZOOKEEPER-1381
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1381
Project: ZooKeeper
Issue Type: Improvement
Components: c client, documentation, java client, server
Affects Versions: 3.4.2
Environment: all
Reporter: nkeywal
Priority: Minor
Zookeeper client API is designed to be server version agnostic as much as
possible, so we can have new clients with old servers (or the opposite). But
there is today no simple way for a client to know what's the server version.
This would be very useful in order to;
- check the compatibility (ex: 'multi' implementation available since 3.4 while
3.4 clients API supports 3.3 servers as well)
- have different implementation depending on the server functionalities
A workaround (proposed by Mahadev Konar) is do "echo stat | nc hostname
clientport" and parse the output to get the version. The output is, for example:
-----------------------
Zookeeper version: 3.4.2--1, built on 01/30/2012 17:43 GMT
Clients:
/127.0.0.1:54951[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Outstanding: 0
Zxid: 0x500000001
Mode: follower
Node count: 7
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