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 <st...@duboce.net> 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 <st...@duboce.net> wrote: >> On Wed, Apr 20, 2011 at 12:25 PM, Stack <st...@duboce.net> wrote: >>> On Tue, Apr 19, 2011 at 4:46 PM, Dmitriy Lyubimov <dlyubi...@apache.org> >>> 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 >> >
