Major Description
On http://docs.couchbase.com/sdk-api/couchbase-core-io-1.2.5/com/couchbase/client/core/RequestCancelledException.html there is no description of what the exception means, which some exceptions do have (e.g http://docs.couchbase.com/sdk-api/couchbase-core-io-1.2.5/com/couchbase/client/core/DocumentMutationLostException.html).
This exception occurs infrequently but often when it does happen customers have not implemented any retry logic, so it causes a lot of concern and there is not much documentation around what this means and how to handle it.
Having a short description of what the error represents and under what circumstances it is likely to occur in the javadoc for the exception would be very useful in helping customers prepare for it and understand why it occurs in their environment.