Fix the cnxns to use a concurrent data structures
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Key: ZOOKEEPER-1347
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1347
Project: ZooKeeper
Issue Type: Sub-task
Components: server
Reporter: Camille Fournier
Fix For: 3.5.0, 3.4.3
Cnxns is currently stored as a HashSet but may be accessed by multiple threads
concurrently. Instead of doing our own sync we should investigate using a
proper concurrent data structure for this.
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