Are you sure about those odds? Winning the UK national lottery has a chance of
13 983 816 to 1 so for just 2 days the odds are
13 983 816^2 = 1.9554711 x 10^14
Brendan Poole
Systems Developer
NewLaw Solicitors
Helmont House
Churchill Way
Cardiff
brendan.p
On Feb 8, 2011, at 21:23, Aaron Morton wrote:
>>> 1) Is data stored in some external data structure, or is it stored in an
>>> actual Cassandra table, as columns within column families?
Yes. Own files next to the CF files and own node IndexColumnFamilies in JMX.
And they are built asynchronousl
After 1 hour ,from the application was done, the size of data folder become
14 GB and the result of cfstats is matching with this number (and Space used
(live) become equal to Space used (total) ).
CF1-Space used (live) :7196278850
Space used (total): 7196278850
CF2-
Thank you for the reply, although I didn't quite understand you. All I got
was that Index data is stored in some kind of external data structure.
Alexander
>
> On Feb 8, 2011, at 21:23, Aaron Morton wrote:
>
1) Is data stored in some external data structure, or is it stored in
an
a
Thank you for the links, I did read a bit in the comments of the ticket,
but I couldn't get much out of it.
I am mainly interested in how the index is stored and partitioned, not how
it is used. I think the people in the dev list will probably be better
qualified to answer that. My questions alway
Hi All,
I'm sure people here have tried to solve similar questions.
Say I'm tracking pages, I want to access the least recently used 1000 unique
pages (i.e. columnnames). How can I achieve this?
Using a row with say, ttl=60 seconds would solve the problem of accessing
the least recently used uniq
Alexander:
The secondary indexes in 0.7.0 (type KEYS) are stored internally in a column
family, and are kept synchronized with the base data via locking on a local
node, meaning they are always consistent on the local node. Eventual
consistency still applies between nodes, but a returned result wi
Until the release vote passes at mojo, you will need to do the
following to follow the example:
svn co https://svn.codehaus.org/mojo/trunk/sandbox/cassandra-maven-plugin
cd cassandra-maven-plugin
mvn install
cd ..
Otherwise the example should be fine.
It's a wiki page, so I'm hoping that people
Thank you very much, this is the information I was looking for. I started
adding secondary index functionality to Cassandra myself, and it turns out
I am doing almost exactly the same thing. I will try to change my code to
use your implementation as well to compare results.
Alexander
> Alexander:
Yes i have done a mistake I know ! But I hoped nobody would notice :).
It is the odds of winning 3 days in a row (standard probability fail). Still
it is totally unlikely
Sorry about this mistake,
Best regards,
Victor K.
Aaron,
It looks like you're experiencing a side-effect of CASSANDRA-2083.
There was at least one place (when node B received updated schema from
node A) where gossip was not being updated with the correct schema
even though DatabaseDescriptor had the right version. I'm pretty sure
this is what yo
One more question: does each node keep an index of their own values, or is
the index global?
Alexander
> Thank you very much, this is the information I was looking for. I started
> adding secondary index functionality to Cassandra myself, and it turns out
> I am doing almost exactly the same thin
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Hi,
There is already an email thread on memory issue on this email list, but I
creating a new thread as we are experiencing a different memory consumption
issue.
We are 12-server cluster. We use random partitioner with manually generated
server tokens. Memory usage on one server keeps growing o
"Iterating through all of the rows matching an index clause on your
cluster is guaranteed to touch N/RF of the nodes in your cluster,
because each node only knows about data that is indexed locally."
On Wed, Feb 9, 2011 at 9:13 AM, wrote:
> One more question: does each node keep an index of thei
On 02/09/2011 11:15 AM, Huy Le wrote:
> There is already an email thread on memory issue on this email list, but I
> creating a new thread as we are experiencing a different memory consumption
> issue.
>
> We are 12-server cluster. We use random partitioner with manually generated
> server tokens
oh you might have to check out and install mojo-sandbox-parent (a sibling
svn url) sandbox projects are not allowed to deploy releases... the vote on
dev@mojo will promote from sandbox and release in one vote 32 h to go
- Stephen
---
Sent from my Android phone, so random spelling mistakes, random
> We are 12-server cluster. We use random partitioner with manually generated
> server tokens. Memory usage on one server keeps growing out of control. We
> ran flush and cleared key and row caches but and ran GC but heap memory
> usage won't go down. The only way to heap memory usage to go dow
(If you're looking at e.g. jconsole graphs a screenshot of the graph
would not hurt.)
--
/ Peter Schuller
Is there any way to specify on per query basis(like we specify the
Consistency level), what rows be cached while you're reading them,
from a row_cache enabled CF. I believe, this could lead to much more
efficient use of the cache space!!( if you use same data for different
features/ parts in your a
On Tue, Feb 8, 2011 at 2:03 AM, David Boxenhorn wrote:
> Shaun, I agree with you, but marking them as deprecated is not good enough
> for me. I can't easily stop using supercolumns. I need an upgrade path.
>
David,
Cassandra is open source and community developed. The right thing to do is
what'
>
> If the heap usages continues to grow an OOM will eventually be thrown.
> Are you experiencing OOMs on these boxes? If you are not OOMing, then
> what problem are you experiencing (excessive CPU use garbage collection
> for one example)?
>
>
>
No OOM. The JVM just too busy doing GC when the us
I still think super-columns are useful you just need to be aware of
the limitations...
Bye,
Norman
2011/2/9 Mike Malone :
> On Tue, Feb 8, 2011 at 2:03 AM, David Boxenhorn wrote:
>>
>> Shaun, I agree with you, but marking them as deprecated is not good enough
>> for me. I can't easily stop usin
>
> To be clear: You are not talking about the size of the Java process in
> top, but the actual amount of heap used as reported by the JVM via
> jmx/jconsole/etc?
>
> This is memory usage shows in JMX that we are talking about.
> Is the memory amount of memory that you consider high, the heap
"help update column family"?
On Wed, Feb 9, 2011 at 1:15 PM, Eranda Sooriyabandara <0704...@gmail.com> wrote:
> Hi Vishan, Aron and all,
>
> Thanks for the help. I tried it and successfully worked for me.
> But I could not find a place where mention about the attributes of some
> commands.
>
> e.g
Currently there is not.
On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote:
> Is there any way to specify on per query basis(like we specify the
> Consistency level), what rows be cached while you're reading them,
> from a row_cache enabled CF. I believe, this could lead to much more
> efficient us
On Wed, Feb 9, 2011 at 11:04 AM, Huy Le wrote:
> Memory usage grows overtime.
It is relatively typical for caches to exert memory pressure over time
as they fill. What are your cache settings, for how many
columnfamilies, and with what sized memtables? What version of
Cassandra?
=Rob
Is this under consideration for future releases ? or being thought about!?
On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis wrote:
> Currently there is not.
>
> On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote:
>> Is there any way to specify on per query basis(like we specify the
>> Consistenc
Not really, no. If you can't trust LRU to cache the hottest rows
perhaps you should split the data into different ColumnFamilies.
On Wed, Feb 9, 2011 at 1:43 PM, Ertio Lew wrote:
> Is this under consideration for future releases ? or being thought about!?
>
>
>
> On Thu, Feb 10, 2011 at 12:56 AM
On Wed, Feb 9, 2011 at 2:43 PM, Ertio Lew wrote:
> Is this under consideration for future releases ? or being thought about!?
>
>
>
> On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis wrote:
>> Currently there is not.
>>
>> On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote:
>>> Is there any way to
I have a 4 node test cluster were I test the port to 0.7.0 from 0.6.X
On 3 out of the 4 nodes I get exceptions in the log.
I am using RP.
Changes that I did:
1. changed the replication factor from 3 to 4
2. configured the nodes to use Dynamic Snitch
3. RR of 0.33
I run repair on 2 nodes before I
Jonathan, what if the data is really homogeneous, but over a long period of
time. I decided that the users who hit the database for recent past should
have a better ride. Splitting into a separate CF also has costs, right?
In fact, if I were to go this way, do you think I can crank down the key
c
On Fri, Feb 4, 2011 at 11:13 AM, Dan Kuebrich wrote:
> Is 2 seconds the normal "I went to disk" latency for cassandra?
Cassandra exposes metrics on a per-CF basis which indicate latency.
This includes both cache hits and misses, as well as requests for rows
which do not exist. It does NOT include
What's the easiest way to change the port nodes listen for comm on from other
nodes? It appears that the default is 8080 which collides with my tomcat server
on one of our dev boxes. I tried doing something in cassandra.yaml like
listen_address: 192.1.fake.2:
but that doesn't work it throws
On 02/09/2011 04:00 PM, jeremy.truel...@barclayscapital.com wrote:
> What's the easiest way to change the port nodes listen for comm on
> from other nodes? It appears that the default is 8080 which collides
> with my tomcat server on one of our dev boxes. I tried doing
> something in cassandra.yaml
Thanks for the heads up that worked.
-Original Message-
From: Chris Burroughs [mailto:chris.burrou...@gmail.com]
Sent: Wednesday, February 09, 2011 4:04 PM
To: user@cassandra.apache.org
Cc: Truelove, Jeremy: IT (NYK)
Subject: Re: Default Listen Port
On 02/09/2011 04:00 PM, jeremy.truel..
On Wed, Feb 9, 2011 at 4:00 PM, wrote:
> What’s the easiest way to change the port nodes listen for comm on from
> other nodes? It appears that the default is 8080 which collides with my
> tomcat server on one of our dev boxes. I tried doing something in
> cassandra.yaml like
>
>
>
> listen_addre
On Thu, 2011-02-03 at 15:35 -0800, Mike Malone wrote:
> In my dealings with the Cassandra code, super columns end up making a
> mess all over the place when algorithms need to be special cased and
> branch based on the column/supercolumn distinction.
>
>
> I won't even mention what it does to t
One of my nodes is 76% full. I know that one of CFs represents 90% of the
data, others are really minor. Can I still compact under these conditions?
Will it crash and lose the data? Will it try to create one very large file
out of fragments, for that dominating CF?
TIA
--
View this message in c
Thanks Gary. I'll keep an eye on things and see if it happens again. From reading the code I'm wondering if there is a small chance of a race condition in HintedHandoffManager.waitForSchemaAgreement() .Could the following happen? I'm a little unsure on exactly how the endpoint state is removed from
On Wed, Feb 9, 2011 at 4:31 PM, Aaron Morton wrote:
> Thanks Gary. I'll keep an eye on things and see if it happens again.
>
> From reading the code I'm wondering if there is a small chance of a race
> condition in HintedHandoffManager.waitForSchemaAgreement() .
>
> Could the following happen? I'm
Out of curiosity, do you really have on the order of 1,986,622,313 elements
(I believe elements=keys) in the cf?
Dan
From: shimi [mailto:shim...@gmail.com]
Sent: February-09-11 15:06
To: user@cassandra.apache.org
Subject: Exceptions on 0.7.0
I have a 4 node test cluster were I test the
unsubscribe
instructions are herehttp://wiki.apache.org/cassandra/FAQ#unsubscribeOn 10 Feb, 2011,at 02:38 PM, Chance Li wrote:unsubscribe
Hi all,
Thanks Jonathan and Eric, you both describes what I want. Now I am looking
forward to play with them.
thanks
Eranda
AFAIK 2nd index only works for operator EQ.
-邮件原件-
发件人: Kallin Nagelberg [mailto:kallin.nagelb...@gmail.com]
发送时间: 2011年2月9日 3:36
收件人: user@cassandra.apache.org
主题: Re: time to live rows
I'm thinking if this row expiry notion doesn't pan out then I might
create a 'lastAccessed' column wi
Did you set compare_with attribute of your ColumnFamily to TimeUUIDType?
-邮件原件-
发件人: Bill Speirs [mailto:bill.spe...@gmail.com]
发送时间: 2011年2月2日 0:47
收件人: Cassandra Usergroup
主题: Row Key Types
What is the type of a Row Key? Can you define how they are compared?
I ask because I'm using Ti
SCFs are very useful and I hope lives forever. We need them!
Best regards/ Pagarbiai
Viktor Jevdokimov
Senior Developer
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453
Konstitucijos pr. 23,
LT-08105 Vilnius,
Lithuania
Disclaimer: The information contained in
Mike, my problem is that I have an database and codebase that already uses
supercolumns. If I had to do it over, it wouldn't use them, for the reasons
you point out. In fact, I have a feeling that over time supercolumns will
become deprecated de facto, if not de jure. That's why I would like to see
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