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.
National Research Center for Intelligent Computing Systems
Institute of Computing technology
Graduate University of Chinese Academy of Science