[jira] [Created] (HBASE-17846) [JDK8] Use Optional instead of Nullable parameter in async client

[Guanghao Zhang (JIRA)]

Guanghao Zhang created HBASE-17846:
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             Summary: [JDK8] Use Optional instead of Nullable parameter in 
async client
                 Key: HBASE-17846
                 URL: https://issues.apache.org/jira/browse/HBASE-17846
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 2.0.0
            Reporter: Guanghao Zhang
            Assignee: Guanghao Zhang


For master branch, we use a lot of java 8 features in async client, like 
lambda, stream, default method and so on. And java 8 support Optional, we can 
update some method to use Optional instead of Nullable parameter. 



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