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HBase >> mail # user >> Risk about RS logs clean ?

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Risk about RS logs clean ?
I want to know how RS eliminates the unnecessary hlogs.
lastSeqNum stores <RegionName, latest KV Seq id>
outputfiles stores <last Seq id before new hlog file, file path>

So, how does rs guarantee that the kv in the hlog to be cleared  have been
already flushed from memstore into hfile.
I have try to read source code to make sense, however, I am not sure
whether it is a source of the risk of data loss.

Bing Jiang
weibo: http://weibo.com/jiangbinglover
BLOG: http://blog.sina.com.cn/jiangbinglover
National Research Center for Intelligent Computing Systems
Institute of Computing technology
Graduate University of Chinese Academy of Science