[jira] [Created] (ZOOKEEPER-1644) Add support for compressed SetWatches packet

["Thawan Kooburat (JIRA)" <ji...@apache.org>]

Thawan Kooburat created ZOOKEEPER-1644:
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             Summary: Add support for compressed SetWatches packet
                 Key: ZOOKEEPER-1644
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1644
             Project: ZooKeeper
          Issue Type: Improvement
          Components: c client, java client, server
            Reporter: Thawan Kooburat


On reconnect with a server to restore its session, a client have to send all watched paths via SetWatches packet to the server. This can be potentially large and exceeded server-side buffer (jute.maxbuffer) causing the session to fail. We have 2 concerns.

1. We can increase jute.maxbuffer to arbitrarily size as a simple workaround, but, in our use case, the number of watch is going to keep growing

2. If a large number of clients get disconnected at once, the server may receive a large amount data over network because of the flood of SetWatches packet. 

In our case, the watch paths should by highly compressible. So our current plan is to add a new type of request which is a compressed set watch request. It should be possible to support multiple compression schemes. We are probably going to use snappy compression but may add support for gzip as a default to minimize external dependency requirement.  

Feel free to comment if you have any suggestion.

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