cache the hashcode of DecoratedKey as it is immutable
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Key: CASSANDRA-4152
URL: https://issues.apache.org/jira/browse/CASSANDRA-4152
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Dave Brosius
Priority: Trivial
Attachments: cache_decoratedkey_hash.diff
cache the hashcode of the DecoratedKey on first hashCode() call. DecoratedKey
is immutable so no need to run thru all ByteBuffer bytes of the key and do
hashcode math.
applied to trunk.
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