I tried to run cassandra-stress on some of my table as proposed by Jake
Luciani.
For a simple table, this tool is able to perform 8 read op/s with a few CPU
consumption if I request the table by the PK(name, tenanted)
Ex :
TABLE :
CREATE TABLE IF NOT EXISTS buckets (tenantid varchar,
name
Well, first off you shouldn't run stress tool on the node your testing. Give
it its own box.
With RF=N=2 your essentially testing a single machine locally which isnt the
best indicator long term (optimizations available when reading data thats local
to the node). 80k/sec on a system is
Is there any harm from having all the nodes listed in the seeds list in
cassandra.yaml?
Donald A. Smith | Senior Software Engineer
P: 425.201.3900 x 3866
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dona...@audiencescience.commailto:dona...@audiencescience.com
[AudienceScience]
Hi,
I am running some load test in a 5 node Cassandra cluster (EC2, single
region, each node has 15 GB RAM, Cassandra version 2.0.6, replication
factor 3). My Java program uses Java driver version 2.0.6 and it does 2000
rounds of batch write queries, each with 8 inserts, 8 updates and 8
deletes.
First of all, Thanks for your help ! :)
Here is some details :
With RF=N=2 your essentially testing a single machine locally which isnt the
best indicator long term
I will test with more nodes, (4 with RF = 2) but for now I'm limited to 2
nodes for non technical reason ...
Well, first off
Well, having all nodes in the seed list does not compromise any correctness
of gossip protocol. However there will be extra network traffic when nodes
are starting because it will ping all nodes for topology discovery, AFAIK
On Tue, Sep 23, 2014 at 7:31 PM, Donald Smith
CPU consumption may be affected from the cassandra-stress tool in 2nd example
as well. Running on a separate system eliminates it as a possible cause.
There is a little extra work but not anything that I think would be that
obvious. tracing (can enable with nodetool) or profiling (ie with
I had done some benching in the past when we faced high CPU usage even
though data set is very small, sitting entirely in memory, read the report
there: https://github.com/doanduyhai/Cassandra_Data_Model_Bench
Our *partial *conclusion were:
1) slice query fetching a page of 64kb of data and
If I had to guess, it might be in part i could be due to inefficiencies in
2.0 with regards to CompositeType (which is used in CQL3 tables) -
Nice catch Daniel. The comment from Sylvain explains a lot !
On Tue, Sep 23, 2014 at 11:33 PM, Daniel Chia danc...@coursera.org wrote:
If I had to guess, it might be in part i could be due to inefficiencies in
2.0 with regards to CompositeType (which is used in CQL3 tables) -
I have a table structure like below -
CREATE TABLE client_data (
client_id int,
consumer_id text,
last_modified_date timestamp,
PRIMARY KEY (client_id, last_modified_date, consumer_id)
)
I have a query pattern like this - Give me everything for what has changed
It is possible to request a range of data according to the
last_modified_date but you still need to provide the client_id , the
partition key, in any case
On Wed, Sep 24, 2014 at 12:23 AM, Check Peck comptechge...@gmail.com
wrote:
I have a table structure like below -
CREATE TABLE
Yes I can provide client_id in my where clause. So now my query pattern
will be -
Give me everything for what has changed within last 15 minutes or 5 minutes
whose client_id is equal to 1?
How does my query will look like then?
On Tue, Sep 23, 2014 at 3:26 PM, DuyHai Doan doanduy...@gmail.com
let previous15Min = now - 15 mins
SELECT * FROM client_data WHERE client_id = 1 and last_modified_date =
previous15Min
Same thing for last 5 mins
On Wed, Sep 24, 2014 at 12:32 AM, Check Peck comptechge...@gmail.com
wrote:
Yes I can provide client_id in my where clause. So now my query pattern
On Tue, Sep 23, 2014 at 3:41 PM, DuyHai Doan doanduy...@gmail.com wrote:
now - 15 mins
Can I run like this in CQL using cqlsh?
SELECT * FROM client_data WHERE client_id = 1 and last_modified_date = now
- 15 mins
When I ran the above query I got an error on my cql client -
Bad Request: line
No, you need to compute yourself now - 15mins. CQL3 does not offer built-in
functions to deal with dates right now
Le 24 sept. 2014 00:47, Check Peck comptechge...@gmail.com a écrit :
On Tue, Sep 23, 2014 at 3:41 PM, DuyHai Doan doanduy...@gmail.com wrote:
now - 15 mins
Can I run like
Hello,
I ran in to a problem today where Cassandra 1.2.18 exhausted its number of
permitted open file descriptors (65,535). This node has 256 tokens (vnodes)
and runs in a test environment with relatively little traffic/data.
As best I could tell, the majority of the file descriptors open were
Hi, It look like the offset in keycache is wrong !!.
refresh the keycache may solve the issue.
Thanks Regards
Job M Thomas
Platform Technology
From: Tim Heckman [mailto:t...@pagerduty.com]
Sent: Wed 9/24/2014 6:17 AM
To: user@cassandra.apache.org
Subject:
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