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- Using fetch and replace together can provide optimistic locking for concurrency control. - Added fetch to get cache entry with its meta data such as revision number. - Added replace to update cache only if it has not been updated. - Added Map Cache protocol version 2 for those new operations. - Existing operations such as get or put can work with protocol version 1. This closes #1410. Signed-off-by: Bryan Bende <bbende@apache.org>