1. we have no way to trace a complete compaction procedure, since there are no
unique info bind with every compaction
we can generate id for every compaction, and print it in rs logs
2. in hbase0.98.10, class CompactSplitThread, line 300,
private synchronized CompactionRequest requestCompactionInternal(final
HRegion r, final Store s,
final String why, int priority, CompactionRequest request, boolean
selectNow)
there are no comment for "selectNow", and the parameter name is hard to
understand, i am wondering when is "now"
had better give some explaination to this parameter and change a more
intuitive name
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