Thank you very much, Mr Jonathan.
On Mon, Feb 1, 2010 at 11:04 AM, Jonathan Ellis jbel...@gmail.com wrote:
On Mon, Feb 1, 2010 at 10:03 AM, Jonathan Ellis jbel...@gmail.com wrote:
I see a lot of CLOSE_WAIT TCP connection.
Also, this sounds like you are not properly pooling client
Hi Carlos!
I'm also really new to Cassandra but here are a couple of links that I found
useful:
http://wiki.apache.org/cassandra/ClientExamples
http://arin.me/blog/wtf-is-a-supercolumn-cassandra-data-model
and one of the presentations like:
Thanks Erik
From: Erik Holstad [mailto:erikhols...@gmail.com]
Sent: Tuesday, February 02, 2010 9:08 AM
To: cassandra-user@incubator.apache.org
Subject: Re: Sample applications
Hi Carlos!
I'm also really new to Cassandra but here are a couple of links that I found
useful:
Hi all,
I would like to know how to retrieve the list of available keys available
for a specific column. There is the get_key_range method, but it is only
available when using the OrderPreservingPartitioner -- I use a
RandomPartitioner.
Does this mean that when using a RandomPartitioner, you
On Mon, Feb 1, 2010 at 3:31 PM, Brandon Williams dri...@gmail.com wrote:
On Mon, Feb 1, 2010 at 5:20 PM, Erik Holstad erikhols...@gmail.comwrote:
Hey!
Have a couple of questions about the best way to use Cassandra.
Using the random partitioner + the multi_get calls vs order preservation +
More or less (but see
https://issues.apache.org/jira/browse/CASSANDRA-745, in 0.6).
Think of it this way: when you have a few billion keys, how useful is
it to list them?
-Jonathan
2010/2/2 Sébastien Pierre sebastien.pie...@gmail.com:
Hi all,
I would like to know how to retrieve the list of
Hi Sebastien!
I'm totally new to Cassandra, but as far as I know there is no way of
getting just the keys that are in the
database, they are not stored separately but only with the data itself.
Why do you want a list of keys, what are you going to use them for? Maybe
there is another way of
On Tue, Feb 2, 2010 at 9:27 AM, Erik Holstad erikhols...@gmail.com wrote:
A supercolumn can still only compare subcolumns in a single way.
Yeah, I know that, but you can have a super column per sort order without
having to restart the cluster.
You get a CompareWith for the columns, and a
On Tue, Feb 2, 2010 at 7:45 AM, Brandon Williams dri...@gmail.com wrote:
On Tue, Feb 2, 2010 at 9:27 AM, Erik Holstad erikhols...@gmail.comwrote:
A supercolumn can still only compare subcolumns in a single way.
Yeah, I know that, but you can have a super column per sort order without
having
Here it is: https://issues.apache.org/jira/browse/CASSANDRA-752
From: Jonathan Ellis jbel...@gmail.com
To: cassandra-user@incubator.apache.org
Sent: Mon, February 1, 2010 5:22:13 PM
Subject: Re: Did CASSANDRA-647 get fixed in 0.5?
Can you create a ticket for
Hi all,
It's basically for knowing what's inside the db, as I've been toying with
Cassandra for some time, I have keys that are no longer useful and should be
removed.
I'm also storing HTTP logs in cassandra, where keys follow this convention
campaign:CAMPAIGN_ID:MMDD. So for instance, if
Hi Jonathan,
In my case, I'll have much more columns (thousands to millions) than keys in
logs (campaign x days), so it's not an issue to retrieve all of them.
Also, if you assume that you can't retrieve values from Cassandra, just
because you're using the wrong key (say your using user/10
2010/2/2 Sébastien Pierre sebastien.pie...@gmail.com
Hi Jonathan,
In my case, I'll have much more columns (thousands to millions) than keys
in logs (campaign x days), so it's not an issue to retrieve all of them.
If that's the case, your dataset is small enough that you could maintain an
Hey!
I'm looking for a comparator that sort columns in reverse order on for
example bytes?
I saw that you can write your own comparator class, but just thought that
someone must have done that already.
--
Regards Erik
you can scan in reversed (reversed=True in slicerange) w/o needing a
custom comparator.
On Tue, Feb 2, 2010 at 11:21 AM, Erik Holstad erikhols...@gmail.com wrote:
Hey!
I'm looking for a comparator that sort columns in reverse order on for
example bytes?
I saw that you can write your own
On Tue, Feb 2, 2010 at 11:21 AM, Erik Holstad erikhols...@gmail.com wrote:
Hey!
I'm looking for a comparator that sort columns in reverse order on for
example bytes?
I saw that you can write your own comparator class, but just thought that
someone must have done that already.
When you
Thanks guys!
So I want to use sliceRange but thinking about using the count parameter.
For example give me
the first x columns, next call I would like to call it with a start value
and a count.
If I was to use the reverse param in sliceRange I would have to fetch all
the columns first, right?
On Tue, Feb 2, 2010 at 11:29 AM, Erik Holstad erikhols...@gmail.com wrote:
Thanks guys!
So I want to use sliceRange but thinking about using the count parameter.
For example give me
the first x columns, next call I would like to call it with a start value
and a count.
If I was to use the
Is there a way to use a byte[] as the key instead of a string?
If not what is the main reason for using strings for the key but
the columns and the values can be byte[]? Is it just to be able
to use it as the key in a Map etc or are there other reasons?
--
Regards Erik
On Tue, Feb 2, 2010 at 9:35 AM, Brandon Williams dri...@gmail.com wrote:
On Tue, Feb 2, 2010 at 11:29 AM, Erik Holstad erikhols...@gmail.comwrote:
Thanks guys!
So I want to use sliceRange but thinking about using the count parameter.
For example give me
the first x columns, next call I
On Tue, Feb 2, 2010 at 11:36 AM, Erik Holstad erikhols...@gmail.com wrote:
Is there a way to use a byte[] as the key instead of a string?
no.
If not what is the main reason for using strings for the key but
the columns and the values can be byte[]?
historical baggage. we might switch to
Sorry that there are a lot of questions from me this week, just trying to
better understand
the best way to use Cassandra :)
Let us say that you know the length of your key, everything is standardized,
are there people
out there that just tag the value onto the key so that you don't have to pay
On Tue, Feb 2, 2010 at 9:57 AM, Brandon Williams dri...@gmail.com wrote:
On Tue, Feb 2, 2010 at 11:39 AM, Erik Holstad erikhols...@gmail.comwrote:
Wow that sounds really good. So you are saying if I set it to reverse sort
order and count 10 for the first round I get the last 10,
for the
Thank you!
On Tue, Feb 2, 2010 at 9:41 AM, Jonathan Ellis jbel...@gmail.com wrote:
On Tue, Feb 2, 2010 at 11:36 AM, Erik Holstad erikhols...@gmail.com
wrote:
Is there a way to use a byte[] as the key instead of a string?
no.
If not what is the main reason for using strings for the key
Ok, so 0.6's https://issues.apache.org/jira/browse/CASSANDRA-745 permits
someone using RandomPartitioner to pass start= and finish= to get all
of the rows in their cluster, although in an extremely inefficient way.
We are in a situation like Pierre's, where we need to know what's currently
in the
Thank you for the benchmarks. What version of Cassandra are you using?
I had about 80% performance improvement on single node reads after
using a trunk build with the results from
https://issues.apache.org/jira/browse/CASSANDRA-688 (result caching)
and playing around with the configuration. I am
On Tue, Feb 2, 2010 at 12:51 PM, Jean-Denis Greze jeande...@6coders.com wrote:
Anyway, partially to address the efficiency concern, I've been playing
around with the idea of having 745-like functionality on a per-node basis: a
call to get all of the keys on a particular node as opposed to the
On Tue, Feb 2, 2010 at 9:27 AM, envio user enviou...@gmail.com wrote:
All,
Here are some tests[batch_insert() and get_slice()] I performed on
cassandra.
snip
I am ok with TEST1A and TEST1B. I want to populate the SCF with 500
columns and read 25 columns per key.
snip
This test is
If I understand you correctly, I think I have a decent example. I have
a ColumnFamily which models user preferences for a site in our
system:
UserPreferences : {
123_EDD43E57589F12032AF73E23A6AF3F47 : {
favorite_color : red,
...
}
}
I structured it this way because we have a lot of
Thanks Nate for the example.
I was thinking more a long the lines of something like:
If you have a family
Data : {
row1 : {
col1:val1,
row2 : {
col1:val2,
...
}
}
Using
Sorts : {
sort_row : {
sortKey1_datarow1: [],
sortKey2_datarow2: []
}
}
Instead of
Sorts : {
Hi,
I'm evaluating Cassandra since few days and I'd say it has really high
coolness factor! :)
My biggest question so far is about order-preserving partitioner. I'd
like to have such partitioner for a specific column family, having
random partitioner for others. Is it possible wrt to the current
On Tue, Feb 2, 2010 at 2:53 PM, Wojciech Kaczmarek
kaczmare...@gmail.com wrote:
Hi,
I'm evaluating Cassandra since few days and I'd say it has really high
coolness factor! :)
My biggest question so far is about order-preserving partitioner. I'd
like to have such partitioner for a specific
On Tue, 19 Jan 2010 08:09:13 -0600 Ted Zlatanov t...@lifelogs.com wrote:
TZ My proposal is as follows:
TZ - provide an IPluggableAPI interface; classes that implement it are
TZ essentially standalone Cassandra servers. Maybe this can just
TZ parallel Thread and implement Runnable.
TZ -
On Tue, Feb 2, 2010 at 21:57, Jonathan Ellis jbel...@gmail.com wrote:
My biggest question so far is about order-preserving partitioner. I'd
like to have such partitioner for a specific column family, having
random partitioner for others. Is it possible wrt to the current
architecture?
No.
Erik,
Sure, you could and depending on the workload, that might be quite
efficient for small pieces of data. However, this also sounds like
something that might be better addressed with the addition of a
SuperColumn on Sorts and getting rid of Data altogether:
Sorts : {
sort_row_1 : {
@Nathan
So what I'm planning to do is to store multiple sort orders for the same
data, where they all use the
same data table just fetches it in different orders, so to say. I want to be
able to rad the different sort
orders from the front and from the back to get both regular and reverse sort
Yeah excellent.
I checked that it's doable to convert the data to another Partitioner
using json backup tools - cool. I will probably write own partitioner
so it's good I won't loose my test data (though I assume I need to
pack all my data back to one node, export to json, delete sstables,
change
just remember that you can't mix nodes w/ different partitioner types
in the same cluster.
On Tue, Feb 2, 2010 at 5:04 PM, Wojciech Kaczmarek
kaczmare...@gmail.com wrote:
Yeah excellent.
I checked that it's doable to convert the data to another Partitioner
using json backup tools - cool. I
Erik,
You can do an inverse with 'reversed=true' in SliceRange as part of
the SlicePredicate for both get_slice or get_range_slice. I have not
tried reverse=true on SuperColumn results, but I dont think there is
any difference there - what can't be changed is how things are ordered
but direction
Hey Nate!
What I wanted to do with the get_range_slice was to receive the keys in the
inverted order, so that I could so offset limit queries on key ranges in
reverse
order. Like you said, this can be done for both columns and super columns
with
help of the SliceRange, but not on keys afaik, but
Right, we don't currently support scanning rows in reverse order, but
that is only because nobody has wanted it badly enough to code it. :)
On Tue, Feb 2, 2010 at 6:06 PM, Erik Holstad erikhols...@gmail.com wrote:
Hey Nate!
What I wanted to do with the get_range_slice was to receive the keys in
I don't understand what you mean ;)
Will see what happens when we are done with this first project, will see
if we can get some time to give back.
--
Regards Erik
Ok - I was afraid I was going to miss something with the generic
example before - my apologies on that. You cannot impose an order on
keys like that as far as I am aware. I think maintaining a Sort CF as
you had originally is a decent approach.
Cheers,
-Nate
On Tue, Feb 2, 2010 at 4:06 PM, Erik
Don't be silly, thanks a lot for helping me out!
--
Regards Erik
On Mon, Feb 1, 2010 at 7:38 PM, Jonathan Ellis jbel...@gmail.com wrote:
No. Thrift is just an RPC mechanism. Whether RRDNS, software or
hardware load balancing, or client-based failover like Gary describes
is best is not a one-size-fits-all answer.
Everyone who uses Cassandra would need to
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