HBASE-10499-In write heavy scenario one of the regions does not get flushed causing RegionTooBusyException- Adding a log alone

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1567894 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10452 Fix potential bugs in exception handlers (Ding Yuan)



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HBASE-10511 Add latency percentiles on PerformanceEvaluation

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HBASE-10498 Add new APIs to load balancer interface(Rajesh)

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