libzookeeper-mt2 3.4.5+dfsg-1 (arm64 binary) in ubuntu trusty

 ZooKeeper is a centralized, reliable, service for maintaining configuration
 information, naming, providing distributed synchronization, and group
 services. All of these kinds of services are used in some form or another by
 distributed applications.
 .
 This package contains the multi-threaded libraries for the C bindings.