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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1800) Too many ZK connections
Date Thu, 27 Aug 2009 14:26:59 GMT
Too many ZK connections

                 Key: HBASE-1800
                 URL: https://issues.apache.org/jira/browse/HBASE-1800
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: Jean-Daniel Cryans
             Fix For: 0.20.1, 0.21.0

Currently we open tons of new connections to Zookeeper, like every time we instantiate a new
HTable. There is a maximum number of client connections as described here:

    <description>Property from ZooKeeper's config zoo.cfg.
    Limit on number of concurrent connections (at the socket level) that a
    single client, identified by IP address, may make to a single member of
    the ZooKeeper ensemble. Set high to avoid zk connection issues running
    standalone and pseudo-distributed.

If you hit that max number, ZK will just refuse your connections. Suppose you have 4 maps
running on a server hosting a RS, you may actually lose your connection in the RS and eventually
hit a session timeout. Maybe we should singleton ZKW?

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