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From Robert Coli <rc...@eventbrite.com>
Subject Re: Cassandra Collections performance issue
Date Tue, 09 Feb 2016 01:23:34 GMT
On Mon, Feb 8, 2016 at 2:10 PM, Agrawal, Pratik <paagrawa@amazon.com> wrote:

> Recently we added one of the table fields from as Map<text, text> in *Cassandra
> 2.1.11*. Currently we read every field from Map and overwrite map values.
> Map is of size 3. We saw that writes are 30-40% slower while reads are
> 70-80% slower. Please find below some metrics that can help.
>
> My question is, Are there any known issues in Cassandra map performance?
> As I understand it each of the CQL3 Map entry, maps to a column in
> cassandra, with that assumption we are just creating 3 columns right? Any
> insight on this issue would be helpful.
>

I have previously heard reports along similar lines, but in the other
direction.

eg - "I moved from a collection to a TEXT column with JSON in it, and my
reads and writes both became much faster!"

I'm not sure if the issue has been raised as an Apache Cassandra Jira, iow
if it is a known and expected limitation as opposed to just a performance
issue.

If I were you, I would consider filing a repro case as a Jira ticket, and
responding to this thread with its URL. :D

=Rob

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