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Date: Thu, 21 Jun 2012 20:58:55 -0700 (PDT)
From: Roshan <codevally@gmail.com>
To: cassandra-user@incubator.apache.org
Message-ID: <1340337535995-7580733.post@n2.nabble.com>
Subject: Cassandra 1.0.6 data flush query
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Hi

I am using Cassandra 1.0.6 version in our production system and noticed that
Cassandra flushing the data to SSTable and the file size is < 10MB. With
under moderate write load, the Cassandra flushing lots of memtables with
small sizes. With this compaction doing lots of compactions.

O/S - Centos 64bit Sun Java 1.6_31
VM size - 2.4GB

Following parameters change on cassandra.yaml file.

flush_largest_memtables_at: 0.45 (reduce it from .75)
reduce_cache_sizes_at: 0.55 (reduce it from .85)
reduce_cache_capacity_to: 0.3 (reduce it from .6)
concurrent_compactors: 1
memtable_total_space_in_mb: 200 
in_memory_compaction_limit_in_mb: 16 (from 64MB)
Key cache = 10000
Row cache = 0
Could someone please help me on this.

Thanks
/Roshan
  

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