If installing a standalone instance of Zookeeper, then use something like this:
... roles: - ansible-java-ubuntu - ansible-zookeeper-ubuntu ...
If installing a unified Hadoop instance for Accumulo or other big data applications, be sure to provision Zookeeper first. Many big data applications don't package their own Zookeeper JARs and require zookeeper to be installed on every node, even if zookeeper is disabled. For example, something like this:
... roles: - ansible-java-ubuntu - ansible-zookeeper-ubuntu - ansible-hadoop-ubuntu ...
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