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From Dmitriy Lyubimov <dlie...@gmail.com>
Subject Re: 0.90 latency performance, cdh3b4
Date Wed, 20 Apr 2011 19:44:43 GMT
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 <dlieu.7@gmail.com> 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 <stack@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 <stack@duboce.net> wrote:
>>> On Wed, Apr 20, 2011 at 12:25 PM, Stack <stack@duboce.net> wrote:
>>>> On Tue, Apr 19, 2011 at 4:46 PM, Dmitriy Lyubimov <dlyubimov@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
>>>
>>
>

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