Major Description
From hbase 0.99, Using KeyValue class for hbase I/O is deprecated and in many APIs it was replaced with Cell interface[^1][^2][^3]. This change causes compilation error with hbase 0.99, which is the first hbase version that supports hadoop 2 only.
For this change will be permanent from hbase 1.0 and on, it would be better to be fixed.
[^1]: https://issues.apache.org/jira/browse/HBASE-11805
[^2]: https://issues.apache.org/jira/browse/HBASE-9359
[^3]: https://issues.apache.org/jira/browse/HBASE-10526