Yes -- I already looked thru 'regionserver' metrics some time ago in hbase book. And i am not sure there's a 'inner ttlb' metric.
There are fs latency metrics there but nothing for the respons times. fs latency is essentially hdfs latency AFAICT and that would not be relevant to what i am asking for (for as long as we are hitting LRU block cache anyway). we are not hitting fs. Unless there are more metrics than listed in the Hbase Book? On Wed, Apr 20, 2011 at 12:46 PM, Stack <[email protected]> wrote: > Enable rpc logging. Will show in your ganglia. See metrics article > on hbase home page. > > On Wed, Apr 20, 2011 at 12:44 PM, Dmitriy Lyubimov <[email protected]> wrote: >> 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 >>>>> >>>> >>> >> >
