Creating a new ZooKeeper client can leak file handles
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Key: ZOOKEEPER-1309
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1309
Project: ZooKeeper
Issue Type: Bug
Components: java client
Affects Versions: 3.3.4
Reporter: Daniel Lord
Priority: Critical
If there is an IOException thrown by the constructor of ClientCnxn then file
handles are leaked because of the initialization of the Selector which is never
closed.
final Selector selector = Selector.open();
If there is an abnormal exit from the constructor then the Selector is not
closed and file handles are leaked. You can easily see this by setting the
hosts string to garbage ("qwerty", "asdf", etc.) and then try to open a new
ZooKeeper connection. I've observed the same behavior in production when there
were DNS issues where the host names of the ensemble can no longer be resolved
and the application servers quickly run out of handles attempting to
(re)connect to zookeeper.
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