Too many ZK connections
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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:
{code}
<property>
<name>hbase.zookeeper.property.maxClientCnxns</name>
<value>30</value>
<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.
</description>
</property>
{code}
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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