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From Andrey Ilinykh <ailin...@gmail.com>
Subject Re: Recommended data size for Reads/Writes in Cassandra
Date Thu, 18 Jul 2013 21:31:19 GMT
there is a limit of thrift message ( thrift_max_message_length_in_mb), by
default it is 64m if I'm not mistaken. This is your limit.


On Thu, Jul 18, 2013 at 2:03 PM, hajjat <hajjat@purdue.edu> wrote:

> Hi,
>
> Is there a recommended data size for Reads/Writes in Cassandra? I tried
> inserting 10 MB objects and the latency I got was pretty high. Also, I was
> never able to insert larger objects (say 50 MB) since Cassandra kept
> crashing when I tried that.
>
> Here is my experiment setup:
> I used two Large VMs in EC2 within the same data-center. Inserts have ALL
> consistency (strong consistency).  The latencies were as follows:
> Data size:      10 MB           1 MB            100 Bytes
> Latency:        250ms           50ms            8ms
>
> I've also done the same for two Large VMs across two data-centers. The
> latencies were around:
> Data size:      10 MB           1 MB            100 Bytes
> Latency:        1200ms          800ms   80ms
>
> 1) Ain't the 10 MB latency extremely high?
> 2) Is there a recommended data size to use with Cassandra (e.g., a few
> bytes
> up to 1 MB)?
> 3) Also, I tried inserting 50 MB data but Cassandra kept crashing. Does
> anybody know why? I thought the max data size should be up to 2 GB?
>
> Thanks,
> Mohammad
>
> PS. Here is my python code I use to insert into Cassandra. I put my
> stopwatch timers around the insert statement:
>     fh = open(TEST_FILE,'r')
>     data = str(fh.read())
>
>     POOL = ConnectionPool(keyspace, server_list=['localhost:9160'],
> timeout=None)
>     USER = ColumnFamily(POOL, 'User')
>     USER.insert('Ali', {'data':
>
> data},write_consistency_level=pycassa.cassandra.ttypes.ConsistencyLevel.ALL)
>
>
>
>
> --
> View this message in context:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Recommended-data-size-for-Reads-Writes-in-Cassandra-tp7589141.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at
> Nabble.com.
>

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