Maryann Xue created HBASE-6049:
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             Summary: Serializing "List" containing null elements will cause 
NullPointerException in HbaseObjectWritable.writeObject()
                 Key: HBASE-6049
                 URL: https://issues.apache.org/jira/browse/HBASE-6049
             Project: HBase
          Issue Type: Bug
          Components: io
    Affects Versions: 0.94.0
            Reporter: Maryann Xue


An error case could be in Coprocessor AggregationClient, the median() function 
handles an empty region and returns a List Object with the first element as a 
Null value. NPE occurs in the RPC response stage and the response never gets 
sent.

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