Is there any way to log 'inner' TTLB times the region server incurs for reads?
On Wed, Apr 20, 2011 at 12:43 PM, Dmitriy Lyubimov <[email protected]> wrote: > i just enabled debug logging for o.a.h.hbase logger in that particular > region server... so far not much except for LRUBlock cache spitting > metrics .. > > 2011-04-20 12:28:48,375 DEBUG > org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: total=8.26 > MB, free=190.08 MB, max=198.34 MB, blocks=112, accesses=55732209, > hits=55732083, hitRatio=99.99%%, cachingAccesses=55732195, > cachingHits=55732083, cachingHitsRatio=99.99%%, evictions=0, > evicted=0, evictedPerRun=NaN > 2011-04-20 12:33:48,375 DEBUG > org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: total=8.26 > MB, free=190.08 MB, max=198.34 MB, blocks=112, accesses=56703200, > hits=56703074, hitRatio=99.99%%, cachingAccesses=56703186, > cachingHits=56703074, cachingHitsRatio=99.99%%, evictions=0, > evicted=0, evictedPerRun=NaN > 2011-04-20 12:38:48,375 DEBUG > org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: total=8.26 > MB, free=190.08 MB, max=198.34 MB, blocks=112, accesses=57708231, > hits=57708105, hitRatio=99.99%%, cachingAccesses=57708217, > cachingHits=57708105, cachingHitsRatio=99.99%%, evictions=0, > evicted=0, evictedPerRun=NaN > > > On Wed, Apr 20, 2011 at 12:35 PM, Stack <[email protected]> wrote: >> If one region only, then its located on a single regionserver. Tail >> that regionservers logs. It might tell us something. >> St.Ack >> >> On Wed, Apr 20, 2011 at 12:25 PM, Stack <[email protected]> wrote: >>> On Wed, Apr 20, 2011 at 12:25 PM, Stack <[email protected]> wrote: >>>> On Tue, Apr 19, 2011 at 4:46 PM, Dmitriy Lyubimov <[email protected]> >>>> wrote: >>>>> Right now i am shooting scans returning between 3 and 40 rows and >>>>> regardless of data size, approximately 500-400 QPS. The data tables >>>>> are almost empty and in-memory, so they surely should fit in those 40% >>>>> heap dedicated to them. >>>>> >>>> >>>> How many clients are going against the cluster? If you use less, do >>>> your numbers improve? >>>> >>> >>> And all these clients are going against a single 40 row table? >>> St.Ack >>> >> >
