Added metrics for RecoverableZooKeeper related to specific exceptions,
total failed ZooKeeper API calls and latency histograms for read,
write and sync operations. Also added unit tests for the same. Added
service provider for the ZooKeeper metrics implementation inside the
hadoop compatibility module.
Signed-off-by: Andrew Purtell <apurtell@apache.org>
Conflicts:
hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/RecoverableZooKeeper.java
hbase-metrics-api/src/main/java/org/apache/hadoop/hbase/metrics/PackageMarker.java
defc25c6d1