SSTableSimpleUnsortedWriter call to ColumnFamily.serializedSize iterate through 
the whole columns
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                 Key: CASSANDRA-3141
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3141
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
    Affects Versions: 0.8.3
            Reporter: Benoit Perroud
            Priority: Minor


Every time newRow is called, serializedSize iterate through all the columns to 
compute the size.

Once 1'000'000 columns exist in the CF, it becomes painfull to do at every 
iteration the same computation. Caching the size and incrementing when a Column 
is added could be an option.

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