Optimize CAS operations in ZKAssign by being optimistic rather than always
doing a sync()
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Key: HBASE-3137
URL: https://issues.apache.org/jira/browse/HBASE-3137
Project: HBase
Issue Type: Improvement
Components: zookeeper
Reporter: Jonathan Gray
Fix For: 0.92.0
HBASE-3136 introduces a fix to the CAS operations in ZKAssign by doing a call
to ZK sync() before doing the operation.
This gives correct behavior but requires doing a sync every time, even if it
isn't necessary. Instead, we should be optimistic and only do retries/syncing
if necessary.
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