We've used 'em all and (IMHO)
1) I would avoid Thrift directly.
2) Hector is a sure bet.
3) Astyanax is the up and comer.
4) Kundera is good, but works like an ORM -- so not so good if your
columns aren't defined ahead of time.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Thanks Dean… I hadn't played with that one. I wonder if that would better
fit the bill for the Spring Data Cassandra module I'm hacking on.
https://github.com/boneill42/spring-data-cassandra
I'll poke around.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market
FWIW.. I just threw this together...
http://brianoneill.blogspot.com/2012/08/cassandra-apis-laundry-list.html
Let me know if I missed any others. (I didn't have playorm on there)
-brian
On Thu, Aug 23, 2012 at 9:51 AM, Brian O'Neill boneil...@gmail.com wrote:
Thanks Dean… I hadn't played
Ha… how could I forget? =)
Adding it now.
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
M: 215.588.6024 • @boneill42 http://www.twitter.com/boneill42 •
healthmarketscience.com
You looking for the author of Spring Data Cassandra?
https://github.com/boneill42/spring-data-cassandra
If so, I guess that is me. =)
-brian
---
Brian O'Neill
Lead Architect, Software Development
Apache Cassandra MVP
Health Market Science
The Science of Better Results
2700 Horizon Drive
to email me directly so we don't spam this
list.
(or setup a googlegroup just in case others want to contribute)
-brian
---
Brian O'Neill
Lead Architect, Software Development
Apache Cassandra MVP
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M
You got it. (done)
-brian
On Tue, Sep 4, 2012 at 7:08 AM, Filipe Gonçalves
the.wa.syndr...@gmail.com wrote:
@Brian: you can add the Cassandra::Simple Perl client
http://fmgoncalves.github.com/p5-cassandra-simple/
2012/8/27 Paolo Bernardi berna...@gmail.com
On 08/23/2012 01:40 PM, Thomas
Our data architects (ex-Oracle DBA types) are jumping on the CQL3
bandwagon and creating schemas for us. That triggered me to write a
quick article mapping the CQL3 schemas to how they are accessed via
Java APIs (for our dev team).
I hope others find this useful as well:
Roshni,
We're going through the same debate right now.
I believe native support for JSON (or collections) is on the docket
for Cassandra.
Here is a discussion we had a few months ago on the topic:
http://comments.gmane.org/gmane.comp.db.cassandra.devel/5233
We presently store JSON, but we're
Roshni,
We're using SOLR to support ad hoc queries and fuzzy searches against
unstructured data stored in Cassandra. Cassandra is great for storage
and you can create data models and indexes that support your queries,
provided you can anticipate those queries. When you can't anticipate
the
Along those lines...
We sought to use triggers for external synchronization. If you read through
this issue:
https://issues.apache.org/jira/browse/CASSANDRA-1311
You'll see the idea of leveraging a commit log for synchronization, via
triggers.
We went ahead and implemented this concept in:
@aaronmorton
http://www.thelastpickle.com
On 21/09/2012, at 11:51 AM, Brian O'Neill b...@alumni.brown.edu wrote:
Along those lines...
We sought to use triggers for external synchronization. If you read
through this issue:
https://issues.apache.org/jira/browse/CASSANDRA-1311
You'll see
Well done, Vivek and team!! This release was much anticipated.
I'll give this a test with Spring Data JPA when I return from vacation.
thanks,
-brian
On Sep 21, 2012, at 9:15 PM, Vivek Mishra wrote:
Hi All,
We are happy to announce release of Kundera 2.0.7.
Kundera is a JPA 2.0
Dean,
We have the same question...
We have thousands of separate feeds of data as well (20,000+). To
date, we've been using a CF per feed strategy, but as we scale this
thing out to accommodate all of those feeds, we're trying to figure
out if we're going to blow out the memory.
The initial
Its just a convenient way of prefixing:
http://hector-client.github.com/hector/build/html/content/virtual_keyspaces.html
-brian
On Mon, Oct 1, 2012 at 4:22 PM, Ben Hood 0x6e6...@gmail.com wrote:
Brian,
On Mon, Oct 1, 2012 at 4:22 PM, Brian O'Neill b...@alumni.brown.edu wrote:
We haven't
Without putting too much thought into it...
Given the underlying architecture, I think you could/would have to write
your own partitioner, which would partition based on the prefix/virtual
keyspace.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
Dean,
Great point. I hadn't considered that either. Per my other email, think
we would need a custom partitioner for this? (a mix of
OrderPreservingPartitioner and RandomPartitioner, OPP for the prefix)
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
Agreed.
Do we know yet what the overhead is for each column family? What is the
limit?
If you have a SINGLE keyspace w/ 2+ CF's, what happens? Anyone know?
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon
using Storm, let me know. We have an unreleased version of
the bolt that you probably want to use. (we're waiting on Nathan/Storm to
fix some classpath loading issues)
RE: a customer virtual keyspace Partitioner, point well taken
-brian
---
Brian O'Neill
Lead Architect, Software Development
Exactly.
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
This information transmitted
Hey Vivek,
The same thing happened to me the other day. You may be missing a component in
your compound key.
See this thread:
http://mail-archives.apache.org/mod_mbox/cassandra-dev/201210.mbox/%3ccajhhpg20rrcajqjdnf8sf7wnhblo6j+aofksgbxyxwcoocg...@mail.gmail.com%3E
I also wrote a couple blogs
People probably saw...
http://www.networkworld.com/cgi-bin/mailto/x.cgi?pagetosend=/news/tech/2012/102212-nosql-263595.html
To clarify things take a look at...
http://brianoneill.blogspot.com/2012/10/solid-nosql-benchmarks-from-ycsb-w-side.html
-brian
--
Brian ONeill
Lead Architect, Health
the next few months.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
This information transmitted
Thanks Dean. We'll definitely take a look. (probably in January)
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
M: 215.588.6024 • @boneill42 http://www.twitter.com/boneill42
For those looking to index data in Cassandra with Elastic Search, here
is what we decided to do:
http://brianoneill.blogspot.com/2012/11/big-data-quadfecta-cassandra-storm.html
-brian
--
Brian ONeill
Lead Architect, Health Market Science (http://healthmarketscience.com)
mobile:215.588.6024
Wow...good catch.
We had puppet scripts which automatically assigned the proper tokens given the
cluster size.
What is the range now? Got a link?
-brian
On Nov 10, 2012, at 9:27 PM, Edward Capriolo wrote:
just a note for all. The default partitioner is no longer randompartitioner.
It is
If you are talking about the CQL-client that comes with Cassandra (cqlsh), it
is actually written in Python:
https://github.com/apache/cassandra/blob/trunk/bin/cqlsh
For information on datatypes (and conversion) take a look at the CQL definition:
I don't think Michael and/or Jonathan have published the CQL java driver
yet. (CCing them)
Hopefully they'll find a public home for it soon, I hope to include it in
the Webinar in December.
(http://www.datastax.com/resources/webinars/collegecredit)
-brian
---
Brian O'Neill
Lead Architect
that metadata to the result set
in:
https://github.com/apache/cassandra/blob/trunk/interface/thrift/gen-java/org
/apache/cassandra/thrift/CqlResult.java
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King
Woohoo!
Thanks for making this available.
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
This information transmitted in this email
FWIW --
I'm presenting tomorrow for the Datastax C*ollege Credit Webinar Series:
http://brianoneill.blogspot.com/2012/12/presenting-for-datastax-college-credit.html
I hope to make CQL part of the presentation and show how it integrates
with the Java APIs.
If you are interested, drop in.
-brian
available afterwards.
I also have a laundry list here: (written before I knew about Firebrand)
http://brianoneill.blogspot.com/2012/08/cassandra-apis-laundry-list.html
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon
-frist-java-application
-w.html
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
I reported the issue here. You may be missing a component in your column name.
https://issues.apache.org/jira/browse/CASSANDRA-5138
-brian
On Jan 12, 2013, at 12:48 PM, Shahryar Sedghi wrote:
Hi
I am trying to test my application that runs with JDBC, CQL 3 with Cassandra
1.2. After
Just an FYI --
We will be hosting a webinar tomorrow demonstrating the use of Storm
as a distributed processing layer on top of Cassandra.
I'll be tag teaming with Taylor Goetz, the original author of storm-cassandra.
http://www.datastax.com/resources/webinars/collegecredit
It is part of the
Through CQL, you see the logical schema.
Through CLI, you see the physical schema.
This may help:
http://www.datastax.com/dev/blog/cql3-for-cassandra-experts
-brian
On Mon, Jan 28, 2013 at 7:26 AM, Rishabh Agrawal
rishabh.agra...@impetus.co.in wrote:
I found following issues while working on
cqlsh use keyspace;
cqlsh:cirrus describe tables;
For more info:
cqlsh help describe
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http
Incidentally, we run Astyanax against 1.2.1. We haven't had any issues.
When running against 1.2.0, we ran into this:
https://github.com/Netflix/astyanax/issues/191
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon
/edwardcapriolo/intravert
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
This information transmitted
We are trudging through an options analysis for BI/DW solutions for data
stored in C*.
I'd love to hear people's experiences. Here is what we've found so far:
http://brianoneill.blogspot.com/2013/04/bianalytics-on-big-datacassandra.html
Maybe we just use Intravert with a custom handler to
changing to user@
(at least until we can determine if this can/should be proposed under 1472)
For those interested in analytics and set-based queries, see below...
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon
Great!
Thanks Gabriel. Do you have an example? (are using QueryBuilder?)
I couldn't find the part of the API that allowed you to pass in the byte
array.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King
);
sb.append(ByteBufferUtil.bytesToHex((ByteBuffer)value));
}
Hopefully, the prepared statement doesn't do the conversion.
(I'm not sure if it is a limitation of the CQL protocol itself)
thanks again,
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science
();
LOG.error(repository.get() [ + key + ] byte.length()=[ +
data.length + ]);
return data;
}
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
M: 215.588.6024 • @boneill42 http
Sylvain,
Interesting, when I look at the actual bytes returned, I see the byte array
is prefixed with the keyspace and table name.
I assume I'm doing something wrong in the select. Am I incorrectly using
the ResultSet?
-brian
On Thu, Apr 11, 2013 at 9:09 AM, Brian O'Neill b
the bb.remaining()
bytes starting at bb.arrayOffset() + bb.position() (where bb is the
returned ByteBuffer).
--
Sylvain
-brian
On Thu, Apr 11, 2013 at 9:09 AM, Brian O'Neill b...@alumni.brown.eduwrote:
Yep, it worked like a charm. (PreparedStatement avoided the hex
conversion
Anthony,
We've been looking at elastic search as well. Presently we have SOLR in
place, but it is cumbersome dealing with SOLR schemas when indexing
information out of Cassandra (since you can't anticipate all the columns
ahead of time).
What are you using as your bridge between Cassandra and
,
-brian
Brian O'Neill
Lead Architect, Software Development
Health Market Science | 2700 Horizon Drive | King of Prussia, PA 19406
p: 215.588.6024
blog: http://weblogs.java.net/blog/boneill42/
blog: http://brianoneill.blogspot.com/
From: Anthony Ikeda anthony.ikeda@gmail.com
Reply
/conf/schema.xml#L538
But you may still want to define a schema so you can adjust the index and
query time processing/typing of the field values.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 20/10/2011, at 2:20 AM, Brian O'Neill
Sasha,
Thanks for the feedback. I can appreciate your comment on connection
pooling, and it is certainly a matter of taste/purpose/perspective. In our
case, it helps to have the REST layer because its a more natural fit into
our platform/ecosystem (considering we use COTS ETL tools, workflows,
Sasha,
Thinking a little more about what problem the REST API solves...
To be honest, I agree completely. I don't think a REST layer that provides
the same feature/function as CQL is all that valuable except in cases like I
described (which may not be all that common). Also, to be honest, I
I saw a mention of R on Cassandra:
http://comments.gmane.org/gmane.comp.db.cassandra.user/5681
Does anyone know if this has traction somewhere?
-brian
--
Brian ONeill
Lead Architect, Health Market Science (http://healthmarketscience.com)
mobile:215.588.6024
blog:
the data
directly into Cassandra. (using a ColumnFamilyOutput format)
We are solving this problem right now, so I'll report back.
-brian
Brian O'Neill
Lead Architect, Software Development
Health Market Science | 2700 Horizon Drive | King of Prussia, PA 19406
p: 215.588.6024
blog: http
Up front, I'd like to say this is still pretty raw. We'd love to get
feedback (and better yet contributions ;).
With that as a disclaimer, I added SOLR integration to Virgil.
When you add and delete rows and columns via the REST interface, an index
is updated in SOLR.
For more information check
It should be dead-simple to build a slick GUI on the REST layer.
(@Virgilhttp://code.google.com/a/apache-extras.org/p/virgil/
)
I had planned to crank one out this week (using ExtJS) that mimicked the
Squirrel/Toad look and feel. The UI would have a tree-panel of keyspaces
and column families on
Not sure this is the standard approach, probably more what we came up
with. ;)
We plan to deploy Cassandra behind a firewall denying all traffic on all
ports other than 8080. Access from applications will be limited to the
REST/HTTP layer, which we'll lock down with standard HTTP authentication
I got around to implementing a GUI for Cassandra in Virgil.
It was really simple. (100 lines of javascript)
You can see a screenshot here:
http://code.google.com/a/apache-extras.org/p/virgil/wiki/gui
For those that were looking for a way to embed data visualization into
their applications, you
I'm not sure if this was preventing anyone from using Virgil, but we added
run-modes to Virgil to accomodate users that have an existing cluster.
Now, you can just point Virgil at the remote instance and use it only for
the GUI/REST layer and SOLR integration.
I know I've been spamming the list a bit with new features for Virgil, but
this one is actually really cool...
Enamored with what Riak provides as far as map/reduce via HTTP,
http://wiki.basho.com/MapReduce.html#MapReduce-via-the-HTTP-API
We implemented the same thing for Virgil/Cassandra.
I may have missed it...
Were the presentations posted from NYC?
(Specifically, I'm looking for Nate's McCall's presentation)
-brian
--
Brian ONeill
Lead Architect, Health Market Science (http://healthmarketscience.com)
mobile:215.588.6024
blog: http://weblogs.java.net/blog/boneill42/
blog:
I'm not sure this is the best answer, but all of our webapps (RoR included)
access Cassandra via REST.
That is one of the major reasons we built Virgil.
http://code.google.com/a/apache-extras.org/p/virgil/
It allows us to build the webapps, for the most part, independent of the
actual storage
I'm not sure this is much help, but we actually run Hadoop jobs to load and
extract data to and from HDFS. You can use ColumnFamilyInputFormat to race
over the data in Cassandra and output it to a file. That doesn't solve the
continuous problem, but should give you a batch mechanism to refresh
metrics.
2011/12/10 Jonathan Ellis jbel...@gmail.com
Not yet -- we're working on it.
On Fri, Dec 9, 2011 at 1:48 PM, Brian O'Neill b...@alumni.brown.edu wrote:
I may have missed it...
Were the presentations posted from NYC?
(Specifically, I'm looking for Nate's McCall's presentation
Kevin,
I just pulled the code and read through the design. Great stuff.
Any thought to potentially using this for real-time processing as well? Right
now, we have a set of Hadoop M/R jobs that operate against Cassandra for ETL.
We were looking at using Storm for the real-time processing
If you are looking to add hector, you'll need:
dependency
groupIdme.prettyprint/groupId artifactIdhector/artifactId
version1.0-2/version
/dependency
-brian
Brian O'Neill
Lead Architect, Software Development
Health Market Science | 2700 Horizon Drive | King of Prussia, PA 19406
p
What is the fastest way to copy a column family?
We were headed down the map/reduce path, but that seems silly.
Any file level mechanisms for this?
-brian
--
Brian ONeill
Lead Architect, Health Market Science (http://healthmarketscience.com)
mobile:215.588.6024
blog:
Excellent. We'll give it a try.
Thanks Brandon.
-brian
Brian O'Neill
Lead Architect, Software Development
Health Market Science | 2700 Horizon Drive | King of Prussia, PA 19406
p: 215.588.6024blog: http://weblogs.java.net/blog/boneill42/
blog: http://brianoneill.blogspot.com/
On 1
I can't remember if I asked this question before, but
We're using Cassandra as our transactional system, and building up quite a
library of map/reduce jobs that perform data quality analysis, statistics,
etc.
( 100 jobs now)
But... we are still struggling to provide an ad-hoc query mechanism
benchmark would be helpful)
-brian
On Fri, Jan 20, 2012 at 12:41 PM, Zach Richardson
j.zach.richard...@gmail.com wrote:
How much data do you think you will need ad hoc query ability for?
On Fri, Jan 20, 2012 at 11:28 AM, Brian O'Neill b...@alumni.brown.eduwrote:
I can't remember if I asked
?
(even a simple count / or copy CF benchmark would be helpful)
-brian
On Fri, Jan 20, 2012 at 12:41 PM, Zach Richardson
j.zach.richard...@gmail.com wrote:
How much data do you think you will need ad hoc query ability for?
On Fri, Jan 20, 2012 at 11:28 AM, Brian O'Neill b
Anyone know if there is any activity to deliver triggers?
I saw this quote:
http://www.readwriteweb.com/cloud/2011/10/cassandra-reaches-10-whats-nex.php
Ellis says that he's just starting to think about the post-1.0 world for
Cassandra. Two features do come to mind, though, that missed the boat
call ad-hoc queries.
Regards,
Maxim
On 1/20/2012 9:28 AM, Brian O'Neill wrote:
I can't remember if I asked this question before, but
We're using Cassandra as our transactional system, and building up quite a
library of map/reduce jobs that perform data quality analysis
RDBMS which doesn't scale very well
for what you call ad-hoc queries.
Regards,
Maxim
On 1/20/2012 9:28 AM, Brian O'Neill wrote:
I can't remember if I asked this question before, but
We're using Cassandra as our transactional system, and building up quite a
library of map
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
FYI... we finally got around to releasing a version of Virgil that includes
the ability to deploy jobs to remote Hadoop clusters running against
Cassandra Column Families.
http://brianoneill.blogspot.com/2012/01/virgil-remote-hadoop-job-deployment-via.html
This has enabled an army of people to
FYI -- we moved Virgil to Github to make it easier for people to contribute.
https://github.com/hmsonline/virgil
Also, we created an organization profile (hmsonline) to house all of our
storm/cassandra related work.
https://github.com/hmsonline
Under that profile, we'll be releasing
FYI --
http://brianoneill.blogspot.com/2012/03/cassandra-triggers-for-indexing-and.html
https://github.com/hmsonline/cassandra-triggers
Feedback welcome. Contribution and involvement is even better. ;)
-brian
--
Brian ONeill
Lead Architect, Health Market Science
If you give Virgil a try, let me know how it goes.
The REST layer is pretty solid, but the gui is just a PoC which makes it
easy to see what's in the CFs during development/testing.
(It's only a couple hundred lines of ExtJS code built on the REST layer)
We had plans to add CQL to the gui for
Praveen,
We are certainly interested. To get things moving we implemented an add-on for
Cassandra to demonstrate the viability (using AOP):
https://github.com/hmsonline/cassandra-triggers
Right now the implementation executes triggers asynchronously, allowing you to
implement a java interface
I know we had this conversation over on the dev list a while back:
http://www.mail-archive.com/dev@cassandra.apache.org/msg03914.html
I just wanted to let people know that we added the capability to our
cassandra-indexing extension.
RE: API method signatures changing
That triggers another thought...
What terminology will you use in the book to describe the data model? CQL?
When we wrote the RefCard on
DZonehttp://refcardz.dzone.com/refcardz/apache-cassandra,
we intentionally favored/used CQL terminology. On advisement
FWIW,
We keep most of our system level integrations behind REST using Virgil:
https://github.com/hmsonline/virgil
When a lower-level integration is necessary we use Hector, but
recently we've started using Astyanax and plan to port our Hector
dependencies over to Astyanax when given a chance.
Robin,
We have the same issue right now. We use Tableau for all of our
reporting needs, but we couldn't find any acceptable bridge between it
and Cassandra.
We ended up using cassandra-triggers to replicate the data to Oracle.
https://github.com/hmsonline/cassandra-triggers/
Let us know if you
While Jonathan and crew work on the infrastructure to support triggers:
https://issues.apache.org/jira/browse/CASSANDRA-4285
We have a project going over here that provides a trigger-like capability:
https://github.com/hmsonline/cassandra-triggers/
This is just an FYI.
I experimented w/ Spring Data JPA w/ Cassandra leveraging Kundera.
It sort of worked:
https://github.com/boneill42/spring-data-jpa-cassandra
http://brianoneill.blogspot.com/2012/07/spring-data-w-cassandra-using-jpa.html
I'm now working on a pure Spring Data adapter using
. It doesn't address all
of your concerns, but I tried to capture the motivation behind our
implementation here:
http://brianoneill.blogspot.com/2012/03/cassandra-indexing-good-bad-and-ugl
y.html
-brian
--
Brian O'Neill
Lead Architect, Software Development
Health Market Science | 2700 Horizon Drive | King
If you are deleting the messages after processing, it sounds like you
are using Cassandra as a work queue.
Here are some links for implementing a distributed queue in Cassandra:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Distributed-work-queues-td5226248.html
Philip,
I figured I would reply via blog post. =)
http://brianoneill.blogspot.com/2012/08/a-big-data-trifecta-storm-kafka-and.html
That blog post shows how we pieced together Kafka and Cassandra (via Storm).
With LinkedIn behind Kafka, it is well supported. They use it in
production. (and most
You could always do something like this as well:
http://brianoneill.blogspot.com/2012/05/dumping-data-from-cassandra-like.htm
l
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M
You may want to look at using virtual keyspaces:
http://hector-client.github.io/hector/build/html/content/virtual_keyspaces.html
And follow these tickets:
http://wiki.apache.org/cassandra/MultiTenant
-brian
On May 6, 2013, at 2:37 AM, Darren Smythe wrote:
How many keyspaces can you
FWIW, we were able to integrate Druid and Cassandra.
Its only in PoC right now, but it seems like a powerful combination:
http://brianoneill.blogspot.com/2013/05/cassandra-as-deep-storage-mechanism-for.html
-brian
--
Brian ONeill
Lead Architect, Health Market Science
Mostly for fun, I wanted to throw this out there...
We are undergoing a security audit for our platform (C* + Elastic Search +
Storm). One component of that audit is susceptibility to SQL injection. I
was wondering if anyone has attempted to construct a SQL injection attack
against Cassandra?
% confident
making that assertion.
-brian
---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M: 215.588.6024 @boneill42 http://www.twitter.com/boneill42
healthmarketscience.com
Vivek,
The location of CassandraDaemon changed between versions. (from
org.apache.cassandra.thrift to org.apache.cassandra.service)
It is likely that the start scripts are picking up the old version on the
classpath, which results in the main method not being found.
Do you have CASSANDRA_HOME
Vivek,
You could try echoing the CLASSPATH to double check. Drop an echo into the
launch_service function in the cassandra shell script. (~line 121)
Let us know the output.
-brian
---
Brian O'Neill
Chief Architect
Health Market Science
The Science of Better Results
2700 Horizon Drive King
describe keyspaces;
system test_keyspace system_traces
cqlsh drop keyspace test_keyspace;
THIS HANGS INDEFINITELY
thoughts? user error? worth filing an issue?
One other note this happens using the CQL java driver as well.
-brian
---
Brian O'Neill
Chief Architect
Health Market Science
I removed the data directory just to make sure I had a clean environment.
(eliminating the possibility of corrupt keyspaces/files causing problems)
-brian
---
Brian O'Neill
Chief Architect
Health Market Science
The Science of Better Results
2700 Horizon Drive King of Prussia, PA 19406
M
Great. Thanks Aaron.
FWIW, I am/was porting Virgil over CQL.
I should be able to release a new REST API for C* (using CQL) shortly.
-brian
---
Brian O'Neill
Chief Architect
Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
M: 215.588.6024
We are seeking to replace Acunu in our technology stack / platform. It is
the only component in our stack that is not open source.
In preparation, over the last few weeks I’ve migrated Virgil to CQL. The
vision is that Virgil could receive a REST request to upsert/delete data
(hierarchical
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