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From Eric Stevens <migh...@gmail.com>
Subject Re: Re: Why read row is so slower than read column.
Date Sat, 27 Dec 2014 17:56:01 GMT
Can you send us your exact data model?  Even though you normally use
Thrift, you may also be able to access the data from CQL, and if so, query
tracing is a very powerful feature in CQL which may describe why there is a
performance difference.

Do you do deletes of data?  If so, tombstones really may be the cause of
the performance difference.

On Fri, Dec 26, 2014 at 6:58 PM, <yhqruc@sina.com> wrote:

> I use thrift interface to query the data.
>
>
> ----- -----
>
> What do your CQL queries look like?
>
> -- Jack Krupansky
>
> On Fri, Dec 26, 2014 at 8:00 AM, <yhqruc@sina.com> wrote:
>
> Hi, all:
>
>    In my cf, each row has two column, one column is the timestamp(64bit),
> another column is data which may be 500k about.
>
>
>    I read row, the qps is about 30.
>
>    I read that data column, the qps is about 500.
>
>
>    Why read performance is so slow where add a so small column in read??
>
>
> Thanks.
>
>
>
>

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