Yes, that's the way to do it.
On Wed, Jun 15, 2011 at 9:43 PM, Selva Kumar wrote:
> Thanks Jonathan. Can we turn off RR by READ_REPAIR_CHANCE.= 0. Please
> advice.
>
> Selva
>
>
> From: Jonathan Ellis
> To: user@cassandra.apache.org
> Sent: Tue, June 14, 2011 8:5
On 6/15/11 17:41, Timo Nentwig wrote:
(json can likely be boiled down even more...)
Any JSON (well, probably anything with quotes...) breaks it:
{
"74657374": [["data", "{"foo":"bar"}", 1308209845388000]]
}
[default@foo] set transactions[test][data]='{"foo":"bar"}';
I feared that storing dat
The JSON you are showing below is an export from cassandra?
{ "74657374": [["data", "{"foo":"bar"}", 1308209845388000]] }
Does this work?
{
74657374: [["data", {foo:"bar"}, 1308209845388000]]
}
-sd
On Thu, Jun 16, 2011 at 9:49 AM, Timo Nentwig wrote:
> On 6/15/11 17:41, Timo Nentwig wrote:
>>
On 6/16/11 10:06, Sasha Dolgy wrote:
The JSON you are showing below is an export from cassandra?
Yes. Just posted the solution:
https://issues.apache.org/jira/browse/CASSANDRA-2780?focusedCommentId=13050274&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13050274
On 6/16/11 10:12, Timo Nentwig wrote:
On 6/16/11 10:06, Sasha Dolgy wrote:
The JSON you are showing below is an export from cassandra?
Yes. Just posted the solution:
https://issues.apache.org/jira/browse/CASSANDRA-2780?focusedCommentId=13050274&page=com.atlassian.jira.plugin.system.issuetabpan
Hi,
the "Getting started" website (http://wiki.apache.org/cassandra/GettingStarted)
is out of date
-> the link to the Twissandra demo is broken
-> the new CQL is not mentioned :-)
Beside this I love cassandra!
Best
Christian
Lots of folk use a single disk or raid-1 for the system and commit log and
raid-0 for the data volumes http://wiki.apache.org/cassandra/CassandraHardware
Your money is probably better spent on more nodes with more disks and more
memory. More nodes is always better.
Happy to hear reasons other
Look for log messages at the ERROR level first to find out why it's crashing.
Check for GC pressure during the repair, either using JConsole or log messages
from the GCInspector.
Check the nodetool tpstats to get an idea if the nodes are saturated, i.e. are
their tasks in the pending list. Or
I wrote a blog post about this sort of thing the other day
http://thelastpickle.com/2011/06/13/Down-For-Me/
Let me know if you spot any problems.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 16 Jun 2011, at 02:20, AJ wrote:
Mark,
Solandra doesn't use secondary indexes, the functionality is too limited for
the lucene api. It maintain's it's own indexes in regular column families.
I suggest you look at Solr and decide if this is the functionality you
need, Solandra offers the same api but on Cassandra's distributed m
Short answer: No.
Medium answer: No all nodes are equal. It could create a single point of
failure if a QUOURM could not be formed without a specific node.
Writes are sent to every replica. Reads with Read Repair enabled are also sent
to every replica. For reads the "closest" UP node as dete
See http://wiki.apache.org/cassandra/FAQ#batch_mutate_atomic
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 16 Jun 2011, at 06:26, chovatia jaydeep wrote:
> Cassandra write operation is atomic for all the columns/super columns fo
> DEBUG 14:36:55,546 ... timed out
Is logged when the coordinator times out waiting for the replicas to respond,
the timeout setting is rpc_timeout in the yaml file. This results in the client
getting a TimedOutException.
AFAIK There is no global everything is good / bad flags to check. e.
take a look at mx4j
http://wiki.apache.org/cassandra/Operations#Monitoring_with_MX4J
someone told me once you can call the JMX ops via http, i've not checked
though.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 16 Jun 2011, a
See this thread for background
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Replica-data-distributing-between-racks-td6324819.html
In a multi DC environment, if you calculate the initial tokens for the entire
cluster data will not be evenly distributed.
Cheers
I have a question about querying super column
For example:
I have a supercolumnFamily DEPARTMENT with dynamic superColumn 'EMPLOYEE'(
name, country).
Now for rowKey 'DEPT1' I have inserted multiple super column like:
Employee1{
Name: Vivek
country: India
}
Employee2{
Name: Vivs
country: US
It's a difficult questions to answer in the abstract. Some thoughts...
Scaling by adding one node at time is not optimal. The best case scenario is
to double the number of nodes, as this means existing nodes only have to stream
their data to a new node. Obviously this is not always possible. Wh
Hi All,
We are upgrading cassandra from 0.6.3 to 0.7.5.We have two node in
cluster.I am bit confused how to upgrade them can you have any guide.
--
S.Ali Ahsan
Senior System Engineer
e-Business (Pvt) Ltd
49-C Jail Road, Lahore, P.O. Box 676
Lahore 54000, Pakistan
Tel: +92 (0)42 3758 7140 E
Well, you are looking for the secondary index.
But for now,AFAIK, the supercolumn can not use secondary index .
On 16/06/2011 13:55, Vivek Mishra wrote:
Now for rowKey 'DEPT1' I have inserted multiple super column like:
*Employee1{*
*Name: Vivek*
*country: India*
*}*
**
*Employee2{*
*Nam
Hi all!
Assuming a node ends up in GC land for a while, there is a good chance that
even though it performs terribly and the dynamic snitching will help you to
avoid it on the gossip side, it will not really help you much if thrift
still accepts requests and the thrift interface has choppy perform
AJ,
sorry I seemed to miss the original email on this thread. As Aaron
said, when computing tokens for multiple data centers, you should
compute them independently for each data center - as if it were its
own Cassandra cluster.
You can have "overlapping" token ranges between multiple data center
LOL, I feel Eric's pain. This double-ring thing can throw you for a
loop since, like I said, there is only one place it is documented and it
is only *implied*, so one is not sure he is interpreting it correctly.
Even the source for NTS doesn't mention this.
Thanks for everyone's help on this
Thanks Eric! I've finally got it! I feel like I've just been initiated
or something by discovering this "secret". I kid!
But, I'm thinking about using OldNetworkTopStrat. Do you, or anyone
else, know if the same rules for token assignment applies to ONTS?
On 6/16/2011 7:21 AM, Eric tamme
Hi Everyone,
I'm seeing Cassandra GC a lot and I would like to tune the Young space and
the Tenured space. Anyone would have recommendations on the NewRatio or
NewSize/MaxNewSize to use for an environment where Cassandra has several
column families and in which we are doing a mixed load of reading
i use jdk1.6 to install and launch cassandra in a linux platform,but can i use
jdk1.5 for my cassandra Client ?
Have 1 row with employee info for country/office/division, each column an
employee id and json info about the employee or a reference.to.another row
id for that employee data
No more supercolumn.
On Jun 16, 2011 1:56 PM, "Vivek Mishra" wrote:
> I have a question about querying super column
>
Good morning all.
Hypothetical Setup:
1 data center
RF = 3
Total nodes > 3
Problem:
Suppose I need maximum consistency for one critical operation; thus I
specify CL = ALL for reads. However, this will fail if only 1 replica
endpoint is down. I don't see why this fail is necessary all of the
So, with ec2 ... 3 regions (DC's), each one is +1 from another?
On Jun 16, 2011 3:40 PM, "AJ" wrote:
> Thanks Eric! I've finally got it! I feel like I've just been initiated
> or something by discovering this "secret". I kid!
>
> But, I'm thinking about using OldNetworkTopStrat. Do you, or any
On Thu, Jun 16, 2011 at 11:11 AM, Sasha Dolgy wrote:
> So, with ec2 ... 3 regions (DC's), each one is +1 from another?
I dont use ec2, so I am not familiar with the specifics of deployment
there. That said, if you have 3 data centers with equal nodes in each
(so that you would calculate the
Hi,
I was following the CQL example on the DataStax website and was able to
create a new column family and query it. But when I viewed the column family
in the CLI, it gives me the following error.
# Unable to read column family created from CQL
[default@store] list users2;
*users2 not found in
Read NEWS.txt.
0.7.6 is better than 0.7.5, btw.
On Thu, Jun 16, 2011 at 5:03 AM, Ali Ahsan wrote:
> Hi All,
>
> We are upgrading cassandra from 0.6.3 to 0.7.5.We have two node in cluster.I
> am bit confused how to upgrade them can you have any guide.
>
> --
> S.Ali Ahsan
>
> Senior System Engine
If you create CFs outside the cli, you may need to restart it to
refresh its internal cache of the schema.
On Thu, Jun 16, 2011 at 8:51 AM, yikes bigdata wrote:
> Hi,
> I was following the CQL example on the DataStax website and was able to
> create a new column family and query it. But when I vi
The second error (the CQL select) is because you have different Key Validation
Class values for your two user columns. users is
org.apache.cassandra.db.marshal.BytesType, while users2 is
org.apache.cassandra.db.marshal.UTF8Type. The select is failing because you are
comparing a String to a bu
On Thu, Jun 16, 2011 at 8:18 AM, AJ wrote:
> Good morning all.
>
> Hypothetical Setup:
> 1 data center
> RF = 3
> Total nodes > 3
>
> Problem:
> Suppose I need maximum consistency for one critical operation; thus I
> specify CL = ALL for reads. However, this will fail if only 1 replica
> endpoint
On Thu, Jun 16, 2011 at 6:11 AM, Terje Marthinussen
wrote:
> Hi all!
> Assuming a node ends up in GC land for a while, there is a good chance that
> even though it performs terribly and the dynamic snitching will help you to
> avoid it on the gossip side, it will not really help you much if thrift
Ah that works.
Thanks everyone for the help.
On Thu, Jun 16, 2011 at 9:04 AM, Konstantin Naryshkin
wrote:
> The second error (the CQL select) is because you have different Key
> Validation Class values for your two user columns. users is
> org.apache.cassandra.db.marshal.BytesType,
> while us
There's possibility to use command line JMX client with standard Zabbix
agent to request JMX counters without incorporating zapcat into Cassandra or
another Java app.
I'm investigating this feature right now, will post results when finish.
2011/6/15 Viktor Jevdokimov
> http://www.kjkoster.org/za
On 6/16/2011 10:05 AM, Ryan King wrote:
I don't think this buys you anything that you can't get with quorum
reads and writes.
-ryan
QUORUM <= ALL_AVAIL <= ALL == RF
I think this would add a lot of complexity behind the scenes and be
conceptually confusing, particularly for new users. The Cassandra consistency
model is pretty elegant and this type of approach breaks that elegance in many
ways. It would also only really be useful when the value has a high pro
This is what I use:
http://code.google.com/p/simple-cassandra-monitoring/
Disclaimer: I did it myself, don't expect too much :P
El jue, 16-06-2011 a las 19:35 +0300, Viktor Jevdokimov escribió:
> There's possibility to use command line JMX client with standard
> Zabbix agent to request JMX count
consistency level definition should be a definition of requirement from the
application perspective,
it should not be tied to some ephemeral state in the system (: a node being
deemed "available/up" or down is determined by
the gossip and changes every second )
what you want can be simply achieve
Seems like a more robust solution would be to implement
dynamic-snitch-like behavior in the client. Hector has done this for
a few months now.
https://github.com/rantav/hector/blob/master/core/src/main/java/me/prettyprint/cassandra/connection/DynamicLoadBalancingPolicy.java
On Thu, Jun 16, 2011 a
On Jun 13, 2011, at 5:10 AM, aaron morton wrote:
>> I am wondering how to index on the most recent hour as well. (ie show me top
>> 5 URLs type query)..
>
> AFAIK thats not a great application for counters. You would need range
> support in the secondary indexes so you could get the first X r
On 6/16/2011 10:58 AM, Dan Hendry wrote:
I think this would add a lot of complexity behind the scenes and be
conceptually confusing, particularly for new users.
I'm not so sure about this. Cass is already somewhat sophisticated and
I don't see how this could trip-up anyone who can already gras
On Thu, Jun 16, 2011 at 1:05 PM, AJ wrote:
> On 6/16/2011 10:58 AM, Dan Hendry wrote:
>>
>> I think this would add a lot of complexity behind the scenes and be
>> conceptually confusing, particularly for new users.
>
> I'm not so sure about this. Cass is already somewhat sophisticated and I
> don
So long as the Volcanic Ash stays away I'll be visiting Auckland next week on
the 23rd and 24th.
Drop me an email if you would like to meet to talk about things Cassandra.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 6/16/2011 2:37 PM, Ryan King wrote:
On Thu, Jun 16, 2011 at 1:05 PM, AJ wrote:
The Cassandra consistency model is pretty elegant and this type of
approach breaks that elegance in many ways. It would also only really be
useful when the value has a high probability of being updated between
It would be great if Cassandra puts this on their roadmap. There is
lot of durability benefits by incorporating dc awareness into the
write consistency equation.
MongoDB has this feature in their upcoming release:
http://www.mongodb.org/display/DOCS/Data+Center+Awareness#DataCenterAwareness-Taggin
> It would be great if Cassandra puts this on their roadmap. There is
> lot of durability benefits by incorporating dc awareness into the
> write consistency equation.
You may be interested in the discussion here:
https://issues.apache.org/jira/browse/CASSANDRA-2338
--
/ Peter Schuller
> Having a ping column can work if every key is replicated to every node. It
would tell you the cluster is working, sort of. Once the number of nodes is
greater than the RF, it tells you a subset of the nodes works.
The way our check works is that each node checks itself, so in this context
we're
Hi all,
As a way of gaining familiarity with Cassandra I am migrating a table
that is currently stored in a relational database and mapping it into
a Cassandra column family. We add about 700,000 new rows a day to this
table, and the average disk space used per row is ~ 300 bytes
including indexes
On Thu, Jun 16, 2011 at 3:41 PM, E R wrote:
> Hi all,
>
> As a way of gaining familiarity with Cassandra I am migrating a table
> that is currently stored in a relational database and mapping it into
> a Cassandra column family. We add about 700,000 new rows a day to this
> table, and the average
On Thu, Jun 16, 2011 at 2:12 PM, AJ wrote:
> On 6/16/2011 2:37 PM, Ryan King wrote:
>>
>> On Thu, Jun 16, 2011 at 1:05 PM, AJ wrote:
>
>>
The Cassandra consistency model is pretty elegant and this type of
approach breaks that elegance in many ways. It would also only really be
>>>
Anton Belyaev gmail.com> writes:
>
> I guess it is not trivial to modify the package to make it use JSW
> instead of JSVC.
> I am still not sure the JSVC itself is a culprit. Maybe something is
> wrong in my setup.
>
>
>
I am seeing similar behavior using the Brisk Debian packages for Mave
Regards to all Cassandra´ users
I don´t know if Brisk has its own mailing list, so I ask here.
Has Brisk .rpm packages for Red Hat and based distributions (CentOS/Fedora)?
If this is true, Where I can find them?
Thanks a lot for your time.
--
Marcos Luís Ortíz Valmaseda
Software Engineer (Larg
How would your solution deal with complete network partitions? A node being
'down' does not actually mean it is dead, just that it is unreachable from
whatever is making the decision to mark it 'down'.
Following from Ryan's example, consider nodes A, B, and C but within a
fully partitioned network
All:
Why cassandra crash after print the following log?
INFO [SSTABLE-CLEANUP-TIMER] 2011-06-16 14:19:01,020
SSTableDeletingReference.java (line 104) Deleted
/usr/local/rss/DDB/data/data/PSCluster/CsiStatusTab-206-Data.db
INFO [SSTABLE-CLEANUP-TIMER] 2011-06-16 14:19:01,020
SSTableDeletingRe
UPDATE to my suggestion is below.
On 6/16/2011 5:50 PM, Ryan King wrote:
On Thu, Jun 16, 2011 at 2:12 PM, AJ wrote:
On 6/16/2011 2:37 PM, Ryan King wrote:
On Thu, Jun 16, 2011 at 1:05 PM, AJwrote:
The Cassandra consistency model is pretty elegant and this type of
approach breaks that
Yes, there is a brisk list: brisk-us...@googlegroups.com
Packages are available via rpm.datastax.com
On Thu, Jun 16, 2011 at 8:21 PM, Marcos Ortiz Valmaseda wrote:
> Regards to all Cassandra´ users
> I don´t know if Brisk has its own mailing list, so I ask here.
> Has Brisk .rpm packages for Red
On 6/16/2011 7:56 PM, Dan Hendry wrote:
How would your solution deal with complete network partitions? A node
being 'down' does not actually mean it is dead, just that it is
unreachable from whatever is making the decision to mark it 'down'.
Following from Ryan's example, consider nodes A, B,
It would help if you can provide some log messages from the GCInspector so
people can see how much GC is going on.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 17 Jun 2011, at 02:46, Sebastien Coutu wrote:
> Hi Everyone,
>
"Help me out here. I'm trying to visualize a situation where the clients
can access all the C* nodes but the nodes can't access each other. I don't
see how that can happen on a regular ethernet subnet in one data center.
Well, I"m sure there is a case that you can point out. Ok, I will concede
"The Thrift Java compiler creates code that is not compliant with Java 5."
https://issues.apache.org/jira/browse/THRIFT-1170
So you may have trouble getting the thrift API to run.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On
> But, I'm thinking about using OldNetworkTopStrat.
NetworkTopologyStrategy is where it's at.
A
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 17 Jun 2011, at 01:39, AJ wrote:
> Thanks Eric! I've finally got it! I feel like I've jus
On 6/16/2011 9:36 PM, Dan Hendry wrote:
"Help me out here. I'm trying to visualize a situation where the
clients can access all the C* nodes but the nodes can't access each
other. I don't see how that can happen on a regular ethernet subnet
in one data center. Well, I"m sure there is a case
On 6/16/2011 9:45 PM, aaron morton wrote:
But, I'm thinking about using OldNetworkTopStrat.
NetworkTopologyStrategy is where it's at.
Oh yeah? It didn't look like it would serve my requirements. I want 2
full production geo-diverse data centers with each serving as a failover
for the other
Cassandra also uses a bunch of classes that are new in JDK6.
JDK5 is end-of-lifed, time to let it rest in piece.
On Thu, Jun 16, 2011 at 10:41 PM, aaron morton wrote:
> "The Thrift Java compiler creates code that is not compliant with Java 5."
>
> https://issues.apache.org/jira/browse/THRIFT-117
Replication location is determined by the row key, not the location of
the client that inserted it. (Otherwise, without knowing what DC a
row was inserted in, you couldn't look it up to read it!)
On Fri, Jun 17, 2011 at 12:20 AM, AJ wrote:
> On 6/16/2011 9:45 PM, aaron morton wrote:
>>>
>>> But,
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