[ZOOKEEPER-1788] Support clientID field on connection requests

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Raúl Gutiérrez Segalés
• Created: 09/Oct/13 19:43
• Updated: 09/Oct/13 19:43

Description

I suspect it's very common for deployments to have a wide variety of client libraries (different versions/languages) connecting to a given cluster.

It would be handy to have a way to identify clients via a clientID (akin to HTTP's User-Agent header). This could be implemented in ZooKeeperServer#processConnectRequest [1] and be fully backwards compatible.

The clientID could then be kept with the corresponding ServerCnxn instance and be used for better logging (or stats expose through 4-letter commands).

The corresponding client side change would be to expose API to set the clientID on each connection handler (and by default it could be something like "zk java $version", "zk c $version", etc).

Thoughts?

[1] https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zookeeper/server/ZooKeeperServer.java#L797