[rest] publish endpoint and statistics into ZooKeeper
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Key: HBASE-3119
URL: https://issues.apache.org/jira/browse/HBASE-3119
Project: HBase
Issue Type: Improvement
Components: rest
Reporter: Andrew Purtell
Assignee: Andrew Purtell
This change allows the REST interface to publish its endpoint and metrics,
currently only requests/sec, into ZooKeeper. By default a permanent znode tree
is created as needed at {{/hbase/rest/status}} and Stargate instances create
ephemeral children of this with names in the format {{<host>:<port>}}. The
ephemeral znodes contain JSON serialized information about the instance, e.g.
{{{"connector":{"host":"restserver.example.com","port":"8080"},"statistics":{"requests":"13"}}}}
The function of Stargate itself is not affected, except for one significant
change: now if the ZooKeeper service is lost, the Stargate instances will abort
along with the rest of HBase.
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