; scenarios this difference can matter.
>>
>> The question is: is it normal for Cassandra to have a minimum latency of
>> 1 millisecond?
>>
>> I'm using Cassandra 2.1.2, python-driver.
>>
>>
>>
>
>
> --
> Tyler Hobbs
> DataStax <http://datastax.com/>
>
--
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
<http://twitter.com/instaclustr> | (650) 284 9692
" option which improves
>>>> fsync() performance a lot. I have partitions mounted with this option and I
>>>> did a test from Python, using psycopg2 driver, and I got the following
>>>> latencies, in milliseconds:
>>>> - INSERT without COMMIT: 0.0
hich does not appear to be very viable as looking up
>> the entire tree would be ridiculous).
>> >
>> > The hope is to end up with a data model that allows us to display the
>> entire tree quickly, as well as see the entire path to a leaf when
>> sele
lower than the internal C* python driver, but this might be a
question for python-driver folk.
On 28 March 2015 at 00:34, Artur Siekielski wrote:
> On 03/28/2015 12:13 AM, Ben Bromhead wrote:
>
>> One other thing to keep in mind / check is that doing these tests
>> locally th
igration schema can change(add or remove one, two fields). Could you
>> please suggest some tool?
>>
>>
>
--
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
<http://twitter.com/instaclustr> | (650) 284 9692
:00 Stefan Podkowinski > >:
>>
>> Hi
>>>
>>>
>>>
>>> Are there any plans to support Java 8 for Cassandra 2.0, now that Java 7
>>> is EOL?
>>>
>>> Currently Java 7 is also recommended for 2.1. Are there any reasons n
s a good point, yes. I'd still personally prefer the operational
> simplicity of simply spacing out token assignments though, but YMMV.
>
>
>
> --
> ---------
> Nate McCall
> Austin, TX
> @zznate
>
> Co-Founder & Sr. Technical Consultant
> Apache Cassandra Consulting
> http://www.thelastpickle.com
>
--
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
<http://twitter.com/instaclustr> | (650) 284 9692
ahul.bhard...@indiamart.com> wrote:
>
> We want to track active queries on cassandra cluster. Is there any tool or
> way to find all active queries on cassandra ?
>
>
>
> You can get a count of them with :
>
>
>
> https://issues.apache.org/jira/browse/CASSANDRA-5084
>
>
>
> =Rob
>
>
>
--
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
<http://twitter.com/instaclustr> | (650) 284 9692
gt; the sender at the email above and delete this email and any attachments and
>> destroy any copies thereof. Any review, retransmission, dissemination,
>> copying or other use of, or taking any action in reliance upon, this
>> information by persons or entities other than the
s guaranteed.
>
>
> We hope this will be useful to the Apache Cassandra community.
>
>
> Regards,
>
> --
>
> Andrés de la Peña
>
>
> <http://www.stratio.com/>
> Avenida de Europa, 26. Ática 5. 3ª Planta
> 28224 Pozuelo de Alarcón, Madrid
> Te
/meta
>>/rc
>>/tcp
>>
>> Is there something I can configure in OpsCenter so that it serves these
>> URLs from somewhere else, or a list of known URLs that I can remap on the
>> proxy, or better yet, a known proxy configuration to put in front of
>> OpsCenter?
>>
>> Regards,
>>
>> Jonathan
>>
>
>
--
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
<http://twitter.com/instaclustr> | (650) 284 9692
to define its dc / rack and it will
use gossip to discover this information about other nodes.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 10 Dec 2013, at 5:31 am, Marcelo Elias Del Valle
wrote:
> Hello everyone,
>
> I have a cassandr
/apidocs/com/datastax/driver/core/policies/LoadBalancingPolicy.html
… and set the distance based on which zone the node is in.
An alternate method would be to define the zones as data centres and then you
could leverage existing DC aware policies (We've never tried this though).
Ben Bro
m linux in
production (after all the warnings), run most of your cluster on linux, then
run a single node or a separate DC with SmartOS, Solaris, BeOS, OS/2, Minix,
Windows 3.1 or whatever it is that you choose and let us know how it all goes!
Cheers
Ben Bromhead
Instaclustr | www.instaclustr.com | @i
Some imbalance is expected and considered normal:
See http://wiki.apache.org/cassandra/VirtualNodes/Balance
As well as
https://issues.apache.org/jira/browse/CASSANDRA-7032
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 29 Apr 2014, at 7:30 am, DuyHai Doan
be the way to go
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPN_CloudHub.html.
Additionally to access your Cassandra instances from your other VPCs you can
use VPC peering (within the same region). See
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-peering.html
Ben
the public IPs.
If you run in a VPC without public addressing and want to connect from external
hosts you will want to look at a VPN
(http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_VPN.html).
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 13/05/201
round can make range queries slower (the query has more files to visit). See
http://stackoverflow.com/questions/8917882/cassandra-sstables-and-compaction (a
little old but still relevant). Compaction also fixes up things like merging
row fragments (when you write new columns to the same ro
Also once you've got your phi_convict_threshold sorted, if you see these again
check:
http://status.aws.amazon.com/
AWS does occasionally have the odd increased latency issue / outage.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 19/05/2014, at 1:
nonetheless.
Datastax OpsCenter also provides capacity planning and forecasting and can
provide an easy set of metrics you can make your scaling decisions on.
http://www.datastax.com/what-we-offer/products-services/datastax-opscenter
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
-in-cassandra
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 30 May 2014, at 8:40 am, Tupshin Harper wrote:
> When one node or DC is down, coordinator nodes being written through will
> notice this fact and store hints (hinted handoff is the mechani
Java ssl sockets need to be able to build a chain of trust. So having
either a nodes public cert or the root cert in the truststore works (as you
found out).
To get cassandra to use cypher suites > 128 bit you will need to install
the JCE unlimited strength jurisdiction policy files. You will know
Cassandra in a VPC solution, but
we haven’t ever used it in a production environment or with a heavy load, so
caveat emptor.
As for the snitch… the GPFS is definitely the most flexible.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 10 Jun 2014, at 1:42 am
Yes your thinking is correct.
This article from TLP sums it all up beautifully
http://thelastpickle.com/blog/2011/06/13/Down-For-Me.html
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 18 Jun 2014, at 4:18 pm, Prabath Abeysekara
wrote:
> Sorry, the ti
.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 18 Jun 2014, at 7:18 pm, Daniel Chia wrote:
> While they guarantee IOPS, they don't really make any guarantees about
> latency. Since EBS goes over the network, there's so many things in the pa
Nate you are right in that it is a function of logical separation helps for
some reason.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 20 Jun 2014, at 8:17 am, Nate McCall wrote:
> Sorry - should have been clear I was speaking in terms of ro
Create a table with a set as one of the columns using cqlsh, populate with a
few records.
Connect using the cassandra-cli, run list on your table/cf and you'll see how
the sets work.
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 13/07/2014, at 11:
http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-0-prototype-triggers-support
http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/trigger_r.html
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 26 Jul 2014, at 11:32 am, Kevin Burton wrote
Depending on your client, disable automatic client discovery and just specify a
list of all your nodes in your client configuration.
For more details check out
http://xzheng.net/blogs/problem-when-connecting-to-cassandra-with-ruby/ ,
obviously this deals specifically with a ruby client but it s
On ubuntu it is: apt-get install cassandra=1.2.4
So should be similar for debian
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 05/07/2013, at 10:59 PM, Kais Ahmed wrote:
> Hi ben,
>
> You can get it from http://archive.apache.org/dist/
norm (SmartOS is based on Solaris).
Just make sure you test and benchmark all your options, a few days of testing
now will save you weeks of pain.
Good luck!
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr
On 05/08/2013, at 12:34 AM, David Schairer wrote:
> Of course -- my point i
Ben Bromhead
Instaclustr | www.instaclustr.com | @instaclustr | +61 415 936 359
On 14/08/2013, at 10:42 AM, Jon Haddad wrote:
> I strongly recommend against EBS, even with optimized & ebs provisioned. The
> throughput you'll get from local drives is significantly better than wha
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