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From Edward Capriolo <>
Subject Re: Does collection in CQL3 have certain limits?
Date Mon, 02 Sep 2013 15:49:53 GMT
I believe CQL has to fetch and transport the entire row, so if it contains
a collection you transmit the entire collection. C* is mostly about low
latency queries and as the row gets larger keeping low latency becomes

Collections do not support a large number of columns, they were not
designed to do that. IMHO If you are talking about 2K + columns collections
are not for you use old-school c* wide rows.

On Mon, Sep 2, 2013 at 10:36 AM, Keith Wright <> wrote:

>  I know that the size is limited to max short (~32k) because when deserializing the response
from the server, the first item returned is the number of items and its a short.  That being
said you could likely handle this by looking for the overflow and allowing double max short.
> Vikas Goyal <> wrote:
>   As there are two ways to support wide rows in CQL3..One is to use
> composite keys and another is to use collections like Map, List and Set.
> The composite keys method can have millions of columns (transposed to
> rows).. This is solving some of our use cases.
> However, if we use collections, I want to know if there is a limit that
> the collections can store a certain number/amount of data (Like earlier
> with Thrift C* supports up-to 2 billion columns in a row)
>  Thanks,
> Vikas Goyal

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