I had to reconfigure my Cassandra nodes today to allow us to use
Lucandra and made the following changes:
* Shutdown ALL Cassandra instances
* For each node:
o Added in Lucandra Keyspace
o Changed the Partitioner to OrderPreservingPartitioner
o Deleted the folders in my D
Hi everyone,
I'm a new user of Cassandra, and during my tests, I've encountered a problem
with deleting rows from CFs.
I use Cassandra 0.6.2 and coding in Java, using the native Java Thrift API.
The way my application works, I need to delete multiple rows at a time (just
like reads and writes).
Ob
> Daniel:
>
> Thanks. That thread helped me solve my problem.
>
> I was able to run a 700k MySQL record import without a single memory error.
>
> I changed the following sections in storage-conf.xml to fix the OutofMemory
errors:
>
> standard
> batch
> 1
Going to standard mode is not
Take a look at
https://issues.apache.org/jira/browse/CASSANDRA-494
https://issues.apache.org/jira/browse/CASSANDRA-1027
On 22.06.2010 19:00, Ron wrote:
> Hi everyone,
> I'm a new user of Cassandra, and during my tests, I've encountered a
> problem with deleting rows from CFs.
> I use Cassandra
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Dean Steele
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Hello!
I use OrderPreservingPartitioner and assign tokens manually.
Questions are:
1) Why range sorted in alphabetical order, not numeric order ?
It was ok with RandomPartitioner
Address Status Load Range
Ring
84
172.19.0.35
And this one is useful :
https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP
2010/6/22 Shahan Khan
> The wiki is a great place:
>
> http://wiki.apache.org/cassandra/FrontPage
>
> Getting Started: http://wiki.apache.org/cassandra/GettingStarted
>
> Cassandra interfaces with PHP
2010/6/22 Maxim Kramarenko :
> Hello!
>
> I use OrderPreservingPartitioner and assign tokens manually.
>
> Questions are:
>
> 1) Why range sorted in alphabetical order, not numeric order ?
> It was ok with RandomPartitioner
With RandomPartitioner, tokens are md5 hashes, thus number and the
compari
What problems did you run into?
On Mon, Jun 21, 2010 at 6:32 AM, Eugenio Minardi
wrote:
> Hi, I had gave a look to django + cassandra I found the twissandra project
> (a django version of twitter based on cassandra).
> But since I am new to django I couldnt make it work. If you find it
> interest
I want to use UUIDs whose alphanumeric order is the same as their
chronological order. So I'm generating Version 4 UUIDs (
http://en.wikipedia.org/wiki/Universally_Unique_Identifier#Version_4_.28random.29)
as follows:
public class Id
{
static Random random = new Random();
public static Stri
What I would expect to have happen is for the removed node to
disappear from the ring and for nodes that are supposed to get more
data to start streaming it over. I would expect it to be hours before
any new data started appearing anywhere when you are anticompacting
80+GB prior to the streaming p
right.
in other words, you can delete entire rows w/ batch_mutate in 0.6.3 or
trunk, but for 0.6.2 the best workaround is to issue multiple remove
commands.
On Tue, Jun 22, 2010 at 5:09 AM, Mishail wrote:
> Take a look at
>
> https://issues.apache.org/jira/browse/CASSANDRA-494
>
> https://issues
sounds like a problem with your seed configuration
On Tue, Jun 22, 2010 at 3:06 AM, Anthony Ikeda <
anthony.ik...@cardlink.com.au> wrote:
> I had to reconfigure my Cassandra nodes today to allow us to use Lucandra
> and made the following changes:
>
> · Shutdown ALL Cassandra instances
>
Why not just use version 1 UUIDs and TimeUUIDType?
On Tue, Jun 22, 2010 at 8:58 AM, David Boxenhorn wrote:
> I want to use UUIDs whose alphanumeric order is the same as their
> chronological order. So I'm generating Version 4 UUIDs (
> http://en.wikipedia.org/wiki/Universally_Unique_Identifier#Ve
As I understand it, the string value of TimeUUIDType does not sort
alphanumerically in chronological order. Isn't that right?
I want to use these ids in Oracle as well as Cassandra, and I want them to
sort in chronological order. In Oracle they will have to be varchars (I
think).
Even in Cassandr
Gary Dusbabek gmail.com> writes:
>
> *Hopefully* fixed. I was never able to duplicate the problem on my
> workstation, but I had a pretty good idea what was causing the
> problem. Julie, if you're in a position to apply and test the fix, it
> would help help us make sure we've got this one nai
I don't mind missing data for a few hours, it's the weird behaviour of
get_range_slices that's bothering me. I added some logging to
ColumnFamilyRecordReader to see what's going on:
Split startToken=67160993471237854630929198835217410155,
endToken=68643623863384825230116928934887817211
...
Gett
Ah, that sounds like
https://issues.apache.org/jira/browse/CASSANDRA-1198. That it
happened after removetoken is just that that happened to change your
ring topology enough to make your queries start hitting it.
On Tue, Jun 22, 2010 at 10:39 AM, Joost Ouwerkerk wrote:
> I don't mind missing data
In my system, I have a Cassandra front end, and an Oracle back end. Some
information is created in the back end, and pushed out to the front end, and
some information is created in the front end and pulled into the back end.
Question: How do I locate new rows that have been crated in Cassandra, fo
On Tue, Jun 22, 2010 at 09:59, David Boxenhorn wrote:
> In my system, I have a Cassandra front end, and an Oracle back end. Some
> information is created in the back end, and pushed out to the front end, and
> some information is created in the front end and pulled into the back end.
>
> Question:
"Dop Sun" writes:
> Updated.
the first Cassandra client lib to make it into the Maven repositories
will probably end up with a big audience. :-)
-Bjørn
I can envision two fundamentally different approaches:
1. A CF that is CompareWith LONG ... use microsecond timestamps as your keys
... then you can filter by time ranges.
This implies that you are willing to do a double write (once for the original
data and then again for the logging). And a t
On Tue, Jun 22, 2010 at 5:58 AM, David Boxenhorn wrote:
> I want to use UUIDs whose alphanumeric order is the same as their
> chronological order. So I'm generating Version 4 UUIDs (
...
> Is there anything wrong with this idea?
If you want to keep it completely ordered, it's probably not enough
A little bit of time fuzziness on the order of a few milliseconds is fine
with me. This is user-generated data, so it only has to be time-ordered at
the level that a user can perceive.
I have no worries about my solution working - I'm sure it will work. I just
wonder if TimeUUIDType isn't superior
This node's load is now growing at a ridiculous rate. It is at 105GB, with
the next most loaded node at 70.63GB.
Given that RF=3, I would assume that the replicas' nodes would grow
relatively quickly too?
On Mon, Jun 21, 2010 at 6:44 AM, aaron morton wrote:
> According to http://wiki.apache.org/
On 6/22/10 10:07 AM, James Golick wrote:
This node's load is now growing at a ridiculous rate. It is at 105GB,
with the next most loaded node at 70.63GB.
Given that RF=3, I would assume that the replicas' nodes would grow
relatively quickly too?
What Replica Placement Strategy are you using (R
RackUnaware, currently
On Tue, Jun 22, 2010 at 1:26 PM, Robert Coli wrote:
> On 6/22/10 10:07 AM, James Golick wrote:
>
>> This node's load is now growing at a ridiculous rate. It is at 105GB, with
>> the next most loaded node at 70.63GB.
>>
>> Given that RF=3, I would assume that the replicas'
Converting a Forum application to cassandra's data model.
Tables:
Posts [postID, threadID, userID, subject, body, created, lastmodified]
So this table contains the actual question subject and body.
When a user logs in, they want to see a list of their questions, and also
order by the last-modif
How to find out the performance metrics such as write rate per second, and read
rate per second. I could not find out from tpstats and cfstats command.
Are there any attributes in JMX? Can someone please help me.
Thanks,
Mubarak
rate = operations / latency
On Tue, Jun 22, 2010 at 2:50 PM, Mubarak Seyed wrote:
> How to find out the performance metrics such as write rate per second, and
> read rate per second. I could not find out from tpstats and cfstats command.
>
> Are there any attributes in JMX? Can someone please he
Not having an index doesn't matter if you're going to read all the
subcolumns back at once, which IIANM is the idea here.
On Mon, Jun 21, 2010 at 12:20 PM, hu wei wrote:
> in datamodel wiki:
> You can think of each super column name as a term and the columns within as
> the docids with rank info
I looked at the thrift service implementation and got it working.
(Much faster import!)
Thanks!
On Mon, Jun 21, 2010 at 13:09, Oleg Anastasjev wrote:
> Torsten Curdt vafer.org> writes:
>
>>
>> First I tried with my one "cassandra -f" instance then I saw this
>> requires a separate IP. (Why?)
>
On Tue, Jun 22, 2010 at 9:12 AM, David Boxenhorn wrote:
> A little bit of time fuzziness on the order of a few milliseconds is fine
> with me. This is user-generated data, so it only has to be time-ordered at
> the level that a user can perceive.
Ok, so mostly ordered. :-)
> I have no worries ab
I'm having a little block in converting an existing SQL Server schema that we
have into Cassandra Keyspace(s). The whole key-value thing has just not
clicked yet. Do any of you know of any good examples that are more complex
than the example in the readme file?
We are looking to report on web
All,
We have been working through some operations scenarios, so that we are ready to
deploy our first Cassandra cluster into production in the coming months.
During this process our operations folks have asked us to provide a Health
Check service. I am using the word service here very liberally
Gary Dusbabek gmail.com> writes:
>
> *Hopefully* fixed. I was never able to duplicate the problem on my
> workstation, but I had a pretty good idea what was causing the
> problem. Julie, if you're in a position to apply and test the fix, it
> would help help us make sure we've got this one nai
Turns out that this is due to a larger proportion of the wide rows in the
system being located on that node. I moved its token over a little to
compensate for it, but it doesn't seem to have helped at this point.
What's confusing about this is that RF=3 and no other node's load is growing
as quick
On Tue, Jun 22, 2010 at 4:08 PM, James Golick wrote:
> Turns out that this is due to a larger proportion of the wide rows in the
> system being located on that node. I moved its token over a little to
> compensate for it, but it doesn't seem to have helped at this point.
> What's confusing about t
It's compacting at a ridiculously fast rate. The pending compactions have
been growing for a while.
It's also flushing memtables really quickly for a particular CF. Like,
really quickly. Like, one every minute. I increased the thresholds by 10x
and it's still going fast.
On Tue, Jun 22, 2010 at 5
Hi,
Please confirm if this is an issue and should be reported or I am doing
something wrong. I could not find anything relevant on JIRA:
Playing with 0.7 nightly (today's build), I setup a 3 node cluster this way:
- Added one node;
- Loaded default schema with RF 1 from YAML using JMX;
- Loa
Where can i find the java doc for Hector java client? Do i need to build one
from source?
--
Thanks,
Mubarak Seyed.
We had to take a node down for an upgrade last night. When we brought it
back online in the morning, it got slammed by HH data all day so badly that
it was compacting near constantly, and the pending compactions pool was
piling up. I shut most of the writes down to let things catch up, which they
m
I couldn't find the docs online but the Ant build script here in the source:
http://github.com/rantav/hector/blob/master/build.xml
has a javadoc target you can run to generate them... hope that helps...
Jon.
On 22 June 2010 21:25, Mubarak Seyed wrote:
> Where can i find the java doc for Hecto
There isn't an online javadoc page, but the code is online and well
documented and there's a wiki and all sorts of documents and examples
http://github.com/rantav/hector/blob/master/src/main/java/me/prettyprint/cassandra/service/Keyspace.java
http://wiki.github.com/rantav/hector/
On Wed, Jun 23, 2
Having a physical location encoded in the UUID *increases* the chance of a
collision, because it means fewer random bits. There definitely will be more
than one UUID created in the same clock unit on the same machine! The same
bits that you use to encode your few servers can be used for over 100
tr
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