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https://issues.apache.org/jira/browse/HBASE-6049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278894#comment-13278894
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Zhihong Yu commented on HBASE-6049:
-----------------------------------
Can you include a test case (so that we can prevent regression in the future) ?
> 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
> Attachments: HBASE-6049.patch
>
>
> 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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