[jira] [Created] (HBASE-18878) Use Optional instead of Nullable annotation in ObserverContext to better describe that the caller may not be presented

[Duo Zhang (JIRA)]

Duo Zhang created HBASE-18878:
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             Summary: Use Optional instead of Nullable annotation in 
ObserverContext to better describe that the caller may not be presented
                 Key: HBASE-18878
                 URL: https://issues.apache.org/jira/browse/HBASE-18878
             Project: HBase
          Issue Type: Sub-task
            Reporter: Duo Zhang


I've already done lots of Nullable to Optional change when purging the 
interfaces for CP. This is a big one so open a separated issue for it.



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