Hey All,
I have been having problems running 0.7RC2 where one of my two nodes
routinely goes down. Somtimes both of them go down. I am running the nodes
using Ubuntu Lucid LTS 64-bit with kernal version 2.6.32. Currently, both
nodes are running on micro instances on EC2. I will eventual migrate to
So, this is my ring, the third node ran out of disk space:
Address Status State LoadOwnsToken
139315361777093290765734121398073449298
192.168.68.76 Up Normal 37.83
Thank you, I hadn't realized I should use thrift.
Alexander Altanis
> Download the source version of the latest 0.7 from
> http://cassandra.apache.org/download/ and take a look at the
> contrib/word_count example. Specifically, in the
> contrib/word_count/src/WordCountSetup.java file, there are
Hi all,
I have a column family for users of my system and I need to have tags
set to these users. My current plan is to have a column that holds a
string (comma separated tags).
I am not clear if this the best way to do it. Specially because this
may lead to a complications when more than
I have a very similar use case in my system, I've solved it as follows;
If all your users have a unique id, such as a login userid.
You could create a new column family, keyed by the userid, and add columns
which have no value, but the column name is the tag value.
Searching these tags later will
Thanks Nick your suggestion just worked.!!
I just tried the command 'use Keyspace1' (the keyspace i was trying to
access through my php script) at cassandra-cli and it was unable to
let me use that keyspace but I could successfully write another it for
another keyspace that actually existed. T
Hi all
wanted to share a cassandra usage pattern you might want to avoid (if you can).
The combinations of
- heavy rows,
- large volume and
- many updates (overwriting columns)
will lead to a higher count of live ssts (at least if you're not starting mayor
compactions a lot) with many ssts ac
> I have been having problems running 0.7RC2 where one of my two nodes
> routinely goes down. Somtimes both of them go down. I am running the nodes
> using Ubuntu Lucid LTS 64-bit with kernal version 2.6.32. Currently, both
> nodes are running on micro instances on EC2. I will eventual migrate to
>
Hi,
I am experiencing a strange issue when using TimeUUID as columnkeys.
I am storing a number of events with timeUUId as key in a row. Later I try to
query for a slice of that row with a given lower bound timeUUID and
upperBoundTimeUUID (constructed as described in the wiki)
If I inserted the e
> And the data could be more evenly balanced, obviously. However the nodes
> fails to startup because due of lacking disk space (instead of starting up
> and denies further writes it appears to try to process the [6.6G!] commit
> logs). So, I cannot perform any actions on it no more like re-bala
The main diagnosing feature of the problem I was seeing is very high system
CPU with no user CPU utilization(check with top or sar -u), vmstat showing
one process waiting for run-time but never seeming to get it, a high page
scan rate, and no Cassandra error messages (although nodes dying did *seem
On Wed, Dec 22, 2010 at 9:21 AM, Dan Hendry wrote:
> Does memory mapping somehow force the data to stay in memory or prevent it
> memory from being reclaimed for other purposes? Google does not turn up any
> nice simple answers.
>
No.
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder
On Dec 22, 2010, at 16:20, Peter Schuller wrote:
>> And the data could be more evenly balanced, obviously. However the nodes
>> fails to startup because due of lacking disk space (instead of starting up
>> and denies further writes it appears to try to process the [6.6G!] commit
>> logs). So,
> Can one of the Cassandra devs or anybody who knows about memory mapping
> comment on this/my particular mmap situation? I have been thinking about it
> and the start of my problems seemed to correlate to my active dataset and
> single sstable sizes growing beyond the amount of free system memory
One approach is to ask yourself questions as to how you would use this
information, for example
- how often to you go from user to tags
- how often would you want to go from tag->users.
- What kind of reporting would you want to do on tags and how often
- Can multiple people add the sa
You can create keyspaces and column families with cassandra-cli.
Once it is running, type 'help create keyspace;' or 'help create column
family;'
- Tyler
On Wed, Dec 22, 2010 at 8:20 AM, Rajkumar Gupta wrote:
> Thanks Nick your suggestion just worked.!!
>
> I just tried the command 'use Key
>>> BTW what precisely does the Owns column mean?
>>
>> The percentage of the token space owned by the node.
>
> Precisely meaning what? :) On my ring of 5 machines, 3 own about 1/3 and 2
(own only 5% - and one of these contains 1/3 more data than the two largest
in the cluster, it's actually the o
I will frame my question in a different way.
Each user in my system subscribes to updates from selected other users
(updates are aggregated from outside) and tags the users to which he/she
is subscribed to.
In my current design, I have a column family called "Followers" keyed by
userid in w
The error may be due to this
https://issues.apache.org/jira/browse/CASSANDRA-1824 - but you're saying all
the nodes are seeds.
Perhaps connect to each via Jmx or the cli and ask them to describe the schema.
Aaron
On 22/12/2010, at 12:01 PM, mike dooley wrote:
> hi,
>
> i am using version
what do you see in the logs during the list command at debug level?
On Tue, Dec 21, 2010 at 5:01 PM, mike dooley wrote:
> hi,
> i am using version 0.7-rc2 and pelops-c642967 from java. when i try
> to export all the data in a column family i don't get all of the data that
> was inserted. i susp
On Dec 22, 2010, at 16:20, Peter Schuller wrote:
> In any case: Monitoring disk-space is very very important.
So, why doesn't cassandra monitor it itself and stop accepting writes if it
runs out of space?
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