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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Problem while configuring key and row cache?
Date Tue, 21 Aug 2012 14:49:36 GMT
setcachecapacity is obsolete in 1.1+.  Looks like we missed removing
it from nodetool.  See
http://www.datastax.com/dev/blog/caching-in-cassandra-1-1 for
background.

(Moving to users@.)

On Tue, Aug 21, 2012 at 8:19 AM, Amit Handa <amithanda01@gmail.com> wrote:
> I started exploring apache cassandra 1.1.3. I am facing problem with how to
> improve performance of cassandra using caching configurations.
> I tried setting following configurations:
>
> ./nodetool -h 107.108.189.204 setcachecapacity DemoUser Users 200005 0
> ./nodetool -h 107.108.189.204 setcachecapacity DemoUser Users 0 200005
> ./nodetool -h 107.108.189.204 setcachecapacity DemoUser Users 200005 200005
> ./nodetool -h 107.108.189.204 setcachecapacity DemoUser Users 444 444
>
>
> But when i am checking that this particula configuration are really been
> configured using command:
> ./nodetool -h 107.108.189.212 cfstats
>
> it's showing following results for keySpace DemoUser and column Family
> Users:
> *Keyspace: DemoUser
>     Read Count: 21914
>     Read Latency: 0.08268495026010769 ms.
>     Write Count: 87656
>     Write Latency: 0.06009481381765082 ms.
>     Pending Tasks: 0
>         Column Family: Users
>         SSTable count: 1
>         Space used (live): 1573335
>         Space used (total): 1573335
>         Number of Keys (estimate): 22016
>         Memtable Columns Count: 0
>         Memtable Data Size: 0
>         Memtable Switch Count: 1
>         Read Count: 21914
>         Read Latency: 0.083 ms.
>         Write Count: 87656
>         Write Latency: 0.060 ms.
>         Pending Tasks: 0
>         Bloom Filter False Postives: 0
>         Bloom Filter False Ratio: 0.00000
>         Bloom Filter Space Used: 41104
>         Compacted row minimum size: 150
>         Compacted row maximum size: 179
>         Compacted row mean size: 179 *
>
> I am unable to see the effect of above setcachecapacity command. Let me
> know how i can configure the cache capacity, and check it's effect.
>
> With Regards,
> Amit



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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