The biggest feature of this release is that it merges the append/hsync/hflush features of branch-0.20-append, and security features of branch-0.20-security.
Therefore, this is the first official Apache Hadoop release that supports HBase in secure mode!
关于append/hsync/hflush的说明参考
http://jerry051635.iteye.com/admin/blogs/1122818
首个官方在安全模式下支持HBase的Hadoop版本。
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