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From Jeremy Hanna <jeremy.hanna1...@gmail.com>
Subject Re: Best way to determine how a Cassandra cluster is doing
Date Fri, 23 Dec 2011 23:49:04 GMT
One way to get a good bird's eye view of the cluster would be to install DataStax Opscenter
- the community edition is free.  You can do a lot of checks from a web interface that are
based on the jmx hooks that are in Cassandra.  We use it and it's helped us a lot.  Hope it
helps for what you're trying to determine: http://www.datastax.com/products/opscenter
 
On Dec 23, 2011, at 5:34 PM, Pierre-Luc Brunet wrote:

> I just imported a lot of data in a 9 node Cassandra cluster and before I create a new
ColumnFamily with even more data, I'd like to be able to determine how full my cluster currently
is (in terms of memory usage). I'm not too sure what I need to look at. I don't want to import
another 20-30GB of data and realize I should have added 5-6 more nodes.
> 
> In short, I have no idea if I have too few/many nodes right now for what's in the cluster.
> 
> Any help would be greatly appreciated :)
> 
> $ nodetool -h 192.168.1.87 ring
> Address         DC          Rack        Status State   Load            Owns    Token
                                      
>                                                                               151236607520417094872610936636341427313
    
> 192.168.1.87    datacenter1 rack1       Up     Normal  7.19 GB         11.11%  0    
                                      
> 192.168.1.86    datacenter1 rack1       Up     Normal  7.18 GB         11.11%  18904575940052136859076367079542678414
     
> 192.168.1.88    datacenter1 rack1       Up     Normal  7.23 GB         11.11%  37809151880104273718152734159085356828
     
> 192.168.1.84    datacenter1 rack1       Up     Normal  4.2 GB          11.11%  56713727820156410577229101238628035242
     
> 192.168.1.85    datacenter1 rack1       Up     Normal  4.25 GB         11.11%  75618303760208547436305468318170713656
     
> 192.168.1.82    datacenter1 rack1       Up     Normal  4.1 GB          11.11%  94522879700260684295381835397713392071
     
> 192.168.1.89    datacenter1 rack1       Up     Normal  4.83 GB         11.11%  113427455640312821154458202477256070485
    
> 192.168.1.51    datacenter1 rack1       Up     Normal  2.24 GB         11.11%  132332031580364958013534569556798748899
    
> 192.168.1.25    datacenter1 rack1       Up     Normal  3.06 GB         11.11%  151236607520417094872610936636341427313
> -
> 
> # nodetool -h 192.168.1.87 cfstats
>  Keyspace: stats
>  Read Count: 232
>  Read Latency: 39.191931034482764 ms.
>  Write Count: 160678758
>  Write Latency: 0.0492021849459404 ms.
>  Pending Tasks: 0
>    Column Family: DailyStats
>    SSTable count: 5267
>    Space used (live): 7710048931
>    Space used (total): 7710048931
>    Number of Keys (estimate): 10701952
>    Memtable Columns Count: 4401
>    Memtable Data Size: 23384563
>    Memtable Switch Count: 14368
>    Read Count: 232
>    Read Latency: 29.047 ms.
>    Write Count: 160678813
>    Write Latency: 0.053 ms.
>    Pending Tasks: 0
>    Bloom Filter False Postives: 0
>    Bloom Filter False Ratio: 0.00000
>    Bloom Filter Space Used: 115533264
>    Key cache capacity: 200000
>    Key cache size: 1894
>    Key cache hit rate: 0.627906976744186
>    Row cache: disabled
>    Compacted row minimum size: 216
>    Compacted row maximum size: 42510
>    Compacted row mean size: 3453
> -
> 
> [default@stats] describe;
> Keyspace: stats:
>  Replication Strategy: org.apache.cassandra.locator.SimpleStrategy
>  Durable Writes: true
>    Options: [replication_factor:3]
>  Column Families:
>    ColumnFamily: DailyStats (Super)
>      Key Validation Class: org.apache.cassandra.db.marshal.BytesType
>      Default column value validator: org.apache.cassandra.db.marshal.UTF8Type
>      Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type/org.apache.cassandra.db.marshal.UTF8Type
>      Row cache size / save period in seconds / keys to save : 0.0/0/all
>      Row Cache Provider: org.apache.cassandra.cache.ConcurrentLinkedHashCacheProvider
>      Key cache size / save period in seconds: 200000.0/14400
>      GC grace seconds: 864000
>      Compaction min/max thresholds: 4/32
>      Read repair chance: 1.0
>      Replicate on write: true
>      Built indexes: []
>      Column Metadata:
>       (removed)
>      Compaction Strategy: org.apache.cassandra.db.compaction.LeveledCompactionStrategy
>      Compression Options:
>        sstable_compression: org.apache.cassandra.io.compress.SnappyCompressor
> 
> 


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