[jira] [Created] (ZOOKEEPER-2869) Allow for exponential backoff in ClientCnxn.SendThread on connection re-establishment

["Nick Travers (JIRA)" <ji...@apache.org>]

Nick Travers created ZOOKEEPER-2869:
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             Summary: Allow for exponential backoff in ClientCnxn.SendThread on connection re-establishment
                 Key: ZOOKEEPER-2869
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2869
             Project: ZooKeeper
          Issue Type: Improvement
          Components: java client
    Affects Versions: 3.5.3, 3.4.10
            Reporter: Nick Travers
            Priority: Minor


As part of ZOOKEEPER-961, when the client re-establishes a connection to the server, it will sleep for a random number of milliseconds in the range [0, 1000). Introduced [here|https://github.com/apache/zookeeper/commit/d84dc077d576b7cdfbfd003e3425fab85ca29a44].

These reconnects can cause excessive logging in clients if the server is unavailable for an extended period of time, with reconnects every 500ms on average.

One solution could be to allow for exponential backoff in the client. The backoff params could be made configurable.

[3.5.x code|https://github.com/apache/zookeeper/blob/release-3.5.3/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1059].
[3.4.x code|https://github.com/apache/zookeeper/blob/release-3.4.9/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1051].



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