Hi!
Thank you very much for your response!
I have couple of questions regarding it, some are just to make sure I understood
you:
1. regarding time slicing, ifat any point of time I am interested in what
happened in the last T minutes, then I will need to query more than one row of
the Dimention
Ok guys, thank you for the valuable hints you gave me.
For sure, things will perform much better on a real hardware. But my object
maybe isn't really to see what't the max throughput that the datastores
have. It is more or less like, given an equal condition, which one would
perform better.
But I'l
When I did some performance testing on Cassandra 0.7.6, I was getting
10,000 - 20,000 inserts per second on a *single *Cassandra node, on real
hardware (a consumer desktop PC with 4 GB RAM). Cassandra has got
substantially faster since then. I was inserting 1KB columns each on a new
row, if I remem
Thanks for the response!
On Mon, Jan 23, 2012 at 12:18 AM, Tristan Seligmann wrote:
> On Sun, Jan 22, 2012 at 10:11 AM, Eric Czech
> wrote:
> > That's likely because there wasn't previously a validation class for the
> > "age" column before you added that index. In other words, the CLI
> doesn
In general if you are collecting data over time you should consider
partitioning the row's to avoid creating very large rows. Also if you have a
common request you want to support consider modeling it directly rather than
using secondary indexes.
Assuming my understanding of the problem is in
Edward (and Maxim),
I agree. I was just recalling previous performance bake-offs (for other
technologies, long time ago, galaxy far far away) in which the customer had put
together a mockup of the high throughput expected in production and wanted to
make a decision against that one set of numb
Hello,
I have some experience in benchmarking Cassandra against Oracle and in
running on a VM cluster.
While the VM solution will work for many applications, it simply won't
cut it for all. In particular, I observed a large difference in insert
performance when I moved from VM to real hardwar
Good point Milind. (RE: Client-side AOP)
I was thinking server-side to stay with the trigger concept, but we could just
as easily intercept on the client-side.
We'd just need to make sure that all clients got the AOP code injected.
(including all of our map/reduce jobs)
If we get the point-cu
You don't have to use oracle and pay money, you can use postgresql for
example.
Triggers aren't that hard to implement. We actually do.all of our
mutations now via triggers and we did it inside by effectivley overriding
the mutate logic itself.
On Jan 20, 2012 11:42 AM, "Zach Richardson"
wrote:
In some sense 1 for one performance "almost" does not matter. Thou I bet
you can get Cassandra better (I remember old school ycsb white paper
benches against a sharded mysql).
One of the main bullet points of Cassandra is if you want to grow from 4
nodes, to 8 nodes, to 14 nodes, and so on, Cassan
My bad ~s/X:X-Value/Y:Y-Value/ after rereading the SELECT.
/***
sent from my android...please pardon occasional typos as I respond @ the
speed of thought
/
On Jan 22, 2012 6:40 AM, "Milind Parikh" wrote:
The composite-key approach with counters would
The composite-key approach with counters would work very well in this case.
It will also obviate the concern of not knowing the exact column names
apriori...although for efficiencies, you might to look at maintaining a
secondary cachelike cf for lookup
Depending on your data patterns(not to hi
Howdy Gustavo,
One thing that jumped out at me is your having put two cassandra images on the
same box. There may be enough CPU and memory for the two images combined but
you may be seeing some other resource not being shared so nicely - network card
bandwidth, for example.
More generally, th
Hi!
I have cassandra-clientutil, cassandra-jdbc and cassandra-thrift in my libs, but
I get
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.cassandra.cql.jdbc.CassandraDriver
when running
Class.forName("org.apache.cassandra.cql.jdbc.CassandraDriver").newInstance();
Cassandr
On Sun, Jan 22, 2012 at 10:11 AM, Eric Czech wrote:
> That's likely because there wasn't previously a validation class for the
> "age" column before you added that index. In other words, the CLI doesn't
> display values in a UTF8 format until you tell it to so I think the value
> "8" is correct a
Hello,
I've set up a testing evironment for Cassandra and MySQL, to compare both,
regarding *performance only*. And I must admit that I was expecting
Cassandra to beat MySQL. But I've not seen this happening up to now.
My application/use case is INSERT intensive, since I'm not updating
anything, j
Eric,
Thinking even a little bit more about this...
We could go the distributed counter approach with additional column families to
support the ad hoc queries, but use triggers to implement it. That would allow
us to keep the client-side code thin, but achieve the same result... without
nece
Thanks for all the ideas...
Since we can't predict all the values, we actually cut to Oracle today via a
map/reduce job. Oracle is able to support all the ad hoc queries the users
want (via Indexes), but the extract job takes a long time (hours). The users
need more "real-time", which is dri
Hello,
I
That's likely because there wasn't previously a validation class for the
"age" column before you added that index. In other words, the CLI doesn't
display values in a UTF8 format until you tell it to so I think the value
"8" is correct and you could check that by running the CLI command "assume
Us
Hi Everyone,
I am getting started with Cassandra and I decided to play around with the
Example at 'getting started'.
The thing is that something happened that it does not make sense to me, it
looks like the value one value just changed from 38 to 8 after adding an
index.
[default@Twissandra] ge
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