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From Viktor Jevdokimov <Viktor.Jevdoki...@adform.com>
Subject RE: Unable to fetch large amount of rows
Date Mon, 18 Mar 2013 14:35:54 GMT
Please, stop flooding this mail list, your questions are not about Cassandra development, but
about using it.

For Cassandra users there's users mail list: user@cassandra.apache.org
Subscribe to Cassandra users mail list: user-subscribe@cassandra.apache.org





Best regards / Pagarbiai

Viktor Jevdokimov
Senior Developer

Email: Viktor.Jevdokimov@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453

J. Jasinskio 16C,
LT-01112 Vilnius,
Lithuania



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and any copies.> -----Original Message-----
> From: Pushkar Prasad [mailto:pushkar.prasad@airtightnetworks.net]
> Sent: Monday, March 18, 2013 16:30
> To: dev@cassandra.apache.org
> Subject: Unable to fetch large amount of rows
>
> Hi,
>
>
>
> I have following schema:
>
>
>
> TimeStamp
>
> MACAddress
>
> Data Transfer
>
> Data Rate
>
> LocationID
>
>
>
> PKEY is (TimeStamp, MACAddress). That means partitioning is on TimeStamp,
> and data is ordered by MACAddress, and stored together physically (let me
> know if my understanding is wrong). I have 1000 timestamps, and for each
> timestamp, I have 500K different MACAddress.
>
>
>
> When I run the following query, I get RPC Timeout exceptions:
>
>
>
>
>
> Select * from db_table where Timestamp='...'
>
>
>
> From my understanding, this should give all the rows with just one disk seek,
> as all the records for a particular timeStamp. This should be very quick,
> however, clearly, that doesn't seem to be the case. Is there something I am
> missing here? Your help would be greatly appreciated.
>
>
>
> Thanks
>
> PP


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