The next London meetup is coming up on 16th July.
We've got two speakers - Richard Churchill talking about his
experiences rolling out Cassandra at ServiceTick and Tom Wilkie
talking about real time analytics on top of Cassandra.
http://www.meetup.com/Cassandra-London/events/69791362/
Dave
Hi all,
Those in the UK might be interested in the next Cassandra London events:
Monday 20th February
Two talks: "Cassandra as an email storage system" and "CQL - then and now"
http://www.meetup.com/Cassandra-London/events/29569461/
Tuesday 6th March
How Netflix uses Cassandra with Adrian Coc
Hi all,
Quick note about our Cassandra London 1st birthday party!
We'll be looking at what's changed in Cassandra over the past year,
with talks on feature improvements, performance and Hadoop
integration. Please come along if you're UK-based! It's a great chance
to meet other Cassandra users.
h
Hi all,
I'm pleased to announce our next Cassandra meetup on 5th September in
London.
http://www.meetup.com/Cassandra-London/events/29668191/
We will be looking at failure modes in Cassandra (how it deals with nodes
failing and returning etc..) as well as a comparison with HBase. It's a
great o
Hi all,
If you're London based please come along to the Cassandra user group. This
month we're going to be looking at how Cassandra compares with some other
solutions (Riak and Mongo). This will be particularly interesting for anyone
who is still at an early stage and wants to get more of an idea
Hi all,
Any London-based people who are interested in Brisk should come along to the
Cassandra London meetup on Monday. There will be a talk and live demo.
http://www.meetup.com/Cassandra-London/events/16643691/
Dave
Hi all
Influenced by the up and coming "Redis in production" meetup in London, I'm
on the lookout for volunteers to speak at a "Cassandra in production" meetup
(again, in London). You will get the satisfaction of becoming "Internet
famous", plus I will personally buy you a beer.
Links:
http://www
Hi all,
FYI: The next Cassandra London meetup is tonight at Skills Matter. The focus
is Cassandra internals and CQL.
http://www.meetup.com/Cassandra-London/events/15490573/
There will be three talks:
1. Lorenzo Alberton on Bloom Filters, Merkle Trees and some interesting
variants
2. Andrew Hyd
hookup?
> Ash
>
> On 19/03/2011, at 2:25 AM, Dave Gardner wrote:
>
> Hi all,
>
> Anyone based in the UK may be interested in our user group meetup on Monday.
> We will have talks on Hadoop integration and some performance data related to
> this.
>
> Please come a
Hi all,
Anyone based in the UK may be interested in our user group meetup on
Monday. We will have talks on Hadoop integration and some performance data
related to this.
Please come along if you'd like to meet other people using Cassandra or
would like to learn more.
http://www.meetup.com/Cassan
Hi all,
This month's London user group will be on the topic of Hadoop integration.
If anyone is interested in sharing knowledge about how they use Hadoop with
Cassandra then please get in touch, there are some speaker slots available.
If you'd like to learn more then please come along!
http://www
ser-profile data - one CF
> that stores the "timeline", with rows of user-ids, and TimeUUID columns for
> each data-collection-time. Then some post-processing with Hadoop over the
> timelines for each user to build a "Profile"?
>
> Are you on 0.7 or 0.6.x?
>
Dave
Tyler's answer already covers CFs etc..
We are using Cassandra to store user profile data for exactly the sort of
use case you describe. We don't yet store _all_ the data in Cassandra;
currently we are focusing on the stuff we need available for real-time
access. We use Hadoop to analyse the
What about executing writes against both clusters during the changeover?
Interested in this topic because we're currently thinking about the same
thing - how to upgrade to 0.7 without any interruption.
Dave
On 21 January 2011 09:20, Daniel Josefsson wrote:
> No, what I'm thinking of is having t
.?
>
> Please help me as i m new to Apache Cassandra.
>
> if you have any use case like that, please share.
>
> Thanks and regards
>
> Surender Singh
>
>
>
>
>
--
*Dave Gardner*
Technical Architect
[image: imagini_58mmX15mm.png] [image: VisualDNA-Logo-small.pn
http://howfuckedismydatabase.com/nosql/
Another option for "group by" is to simply store data in an aggregated form
under a single key. Basically the principle of "store data how you want to
query it":
http://wiki.apache.org/cassandra/DataModel#Modeling_your_application
Dave
On 19 January 2011
it integer
> support can be problematic if you don't have a fully 64bit system. PHP is
> fairly slow. PHP makes a few other things less easy to do. If you're doing
> some pretty lightweight interaction with Cassandra through PHP, these might
> not be a problem for you
chnology stack for your applications.
>>
>> Any suggestions, comments appreciated ?
>>
>> Thanks
>> Ertio
>>
>
>
>
--
*Dave Gardner*
Technical Architect
[image: imagini_58mmX15mm.png] [image: VisualDNA-Logo-small.png]
*Imagini Europe Limited*
7 Moor Str
I am looking for London-based users of Cassandra who would be interested in
giving a short talk on _how_ they make use of Cassandra, hopefully including
details such as data layout, types of query, load etc.. This is for the
Cassandra London user group -- this month we are planning to have more tha
We've also got Jake Luciani (@tjake) giving a talk at Cassandra London this
Wednesday - this is a great opportunity to meet with other Cassandra users.
There will be some free beer and food available.
http://www.meetup.com/Cassandra-London/calendar/15351291/
Dave
On 6 December 2010 17:05, Jonath
e in a while; or if not, what techniques can be used to clear
> such cluster topology and streaming/replication problems without rebooting.
>
>
--
*Dave Gardner*
Technical Architect
[image: imagini_58mmX15mm.png] [image: VisualDNA-Logo-small.png]
*Imagini Europe Limited*
7 Moor Stree
d of row, it's
> much better at mostly static rows. Rely on keycache and OS file cache for
> these instead.
>
>
>
> -Brandon
>
>
--
*Dave Gardner*
Technical Architect
[image: imagini_58mmX15mm.png] [image: VisualDNA-Logo-small.png]
*Imagini Europe Limited*
7 Moor S
Hi all,
We've been using Cassandra for some months now and have a cluster in
production.
To help us learn more about Cassandra and meet other people who are using it
I have just launched the* London meetup* (partly prompted by the guys who
launched the Israel and Bay Area groups recently).
If yo
benjaminblack/introduction-to-cassandra-replication-and-consistency#13
Is this true, or will read repair still hammer disks in all the
machines with the data on? Again I guess it's better to have low RF so
there are less copied of the data to inspect when doing read repair.
Will this result i
One other question for the list:
I gather GMFD is "gossip stage" - but what does this actually mean? Is it an
issue to have 203 pending operations?
Thanks
Dave
INFO [GC inspection] 2010-09-20 16:56:12,792 GCInspector.java (line 129) GC
for ParNew: 127970 ms, 570382800 reclaimed leaving 4606885
Nope - no swap enabled.
top - 16:53:14 up 12 days, 6:11, 3 users, load average: 1.99, 2.63, 5.03
Tasks: 133 total, 1 running, 132 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 35840228k total, 33077580k used, 2762648k f
As a follow up to this conversation; we are still having issues with our
Cassandra cluster on EC2.
It *looks* to be related to Garbage Collection; however we aren't sure what
the root cause of the problem is. Here is an extract from logs:
INFO [GMFD:1] 2010-09-20 15:22:00,242 Gossiper.java (line
I'm happy to assist. Having a robust PHP implementation would help us greatly.
Dave
On Wednesday, August 18, 2010, Jeremy Hanna wrote:
> As Jonathan mentioned in his keynote at the Cassandra Summit, the thrift +
> php has some bugs and is maintainerless right now.
>
> Is there anyone out there
Yes this is the issue. Thanks.
Dave
On Tuesday, August 3, 2010, Jonathan Ellis wrote:
> Sounds like https://issues.apache.org/jira/browse/THRIFT-638, where
> Arya Goudarzi posted a patch.
>
> On Tue, Aug 3, 2010 at 5:18 AM, Dave Gardner wrote:
>> Hi all
>>
>>
Hi all
I'm working on a PHP/Cassandra application. Yesterday we experienced a
strange situation when testing random reads. The background to this test was
that we inserted 10,000 rows with simple row keys. The number of columns in
each row varies between about 5 columns and 40 columns (all random)
There are quite a few differences. Ultimately it depends on your use
case! For example Mongo has a limit on the maximum "document" size of
4MB, whereas with Cassandra you are not really limited to the volume
of data/columns per-row (I think there maybe a limit of 2GB perhaps;
basically none)
Anoth
Do you have a rough estimate as to when there might be a training day in
London (UK). I'm currently weighing up whether I should be making a journey
across the pond for one of the US-based events.
Thanks
Dave
On 9 July 2010 15:36, Jeremy Dunck wrote:
> On Fri, Jul 2, 2010 at 1:08 PM, Jonathan
Hi all,
Is it possible to use the Cassandra ColumnFamilyInputFormat in combination
with the Hadoop "streaming" job? Within the Hadoop docs it says that you
can specify other plugins, eg:
-inputformat JavaClassName
http://hadoop.apache.org/common/docs/r0.15.2/streaming.html#Specifying+Other+Plug
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