[jira] [Created] (ZOOKEEPER-4261) Observer do not need a serverid

["Jian Wang (Jira)" <ji...@apache.org>]

Jian Wang created ZOOKEEPER-4261:
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             Summary: Observer do not need a serverid
                 Key: ZOOKEEPER-4261
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4261
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.6.2
            Reporter: Jian Wang


I am working on a project which uses Zookeeper as the authority KV store, the write TPS would be quite low, but the read TPS would be some like 10K from 10K clients. So my idea is quite simple, I will use a cache layer(like http) in front of ZK, then my problem become how to keep my cache updated.

After some investigation, I come up with 2 solutions:
 # Run the Observer inside my cache, so that the cache would be updated incrementally, and could be persisted with the stable ZK data dir.
 # [Used https://curator.apache.org/curator-recipes/curator-cache.html.|https://curator.apache.org/curator-recipes/curator-cache.html]

With the approach 1, I come up with the question:

Each server inside ensemble should have a serverid, which is read from data/myid, it is limited to range [0, 255]. I my case I would like to have thousands of Observer process running, which would easily break the limitation. 

After look into the code, I don't think each observer has unique serverid is not necessary (I tested the Observer with a quite large number, it works though). I think we should remove the serverid of Observer so that we could build application on Observer easily and benefit from the streaming of transaction log.

 

 



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