Re: Write performance compared to Postgresql

On three machines on the same subnet as the two cassandra nodes. On Apr 3, 2012, at 6:40 PM, Collard, David L (Dave) wrote: > Where is your client running? > > -Original Message- > From: Jeff Williams [mailto:je...@wherethebitsroam.com] > Sent: Tuesday, April 03, 2012 11:09 AM > To: use

Re: System keyspace leak?

On Wed, Apr 4, 2012 at 3:14 AM, David Leimbach wrote: > Well I just found this: > > http://wiki.apache.org/cassandra/LiveSchemaUpdates > > which explains a ton...  It looks like this particular Column Family will > grow infinitely (it's just one row with a column per migration), so if I'm > poundi

JMX APIs thru MX4J

Hello, I'm working on a fork of Sébastien Giroux Cassandra Cluster Admin and I wish to pull my contributions to the parent code. Here is my repository: https://github.com/atuccia/Cassandra-Cluster-Admin ...and Sébastien Giroux one: https://github.com/sebgiroux/Cassandra-Cluster-Admin I wanna a

Re: JMX APIs thru MX4J

Hi, I can't help you with your other questions, but the type "[Ljava.lang.String;" is an array of String objects. More info here http://en.wikipedia.org/wiki/Java_Native_Interface#Mapping_types Flavio Il 4/4/2012 10:04 AM, Andrea Tuccia ha scritto: Hello, I'm working on a fork of Sébastien G

Re: tombstones problem with 1.0.8

Hi Jonathan, Thanks for your response. We were running a compact at least once a day over the keyspace. The gc_grace was set to only 1 hour, so from what you said I would expect that tombstones should be deleted after max 3 days. When I inspected the data in the SSTables after a compact, some ro

Re: cassandra 1.08 on java7 and win7

I have a cluster of four nodes all running on single machine. If I just do "create keyspace DEMO" CLI gives me the same error that original post says. If I use create the keyspace with the options you mentioned it works just fine but the proble is it is not getting reflected on other nodes in the

server down

I am recently having problems with 1 of my 4ty cluster servers. I would appreciate any help ERROR 11:23:14,331 Fatal exception in thread Thread[MutationStage:19,5,main] 225 java.lang.InternalError: a fault occurred in a recent unsafe memory access operation in compiled Java code 226 at o

Re: data size difference between supercolumn and regular column

Cool, I will look into this new leveled compaction strategy and give it a try. BTW, Aaron, I think the last word of your message meant to say "compression", correct? -- Y. On Mon, Apr 2, 2012 at 9:37 PM, aaron morton wrote: > If you have a workload with overwrites you will end up with some data

Linux Filesystem for Cassandra

Hi, There has been no discussion on this list on the choice of a Linux file system for Cassandra. Does this choice make a difference? Would you, please share, what filesystem you are using? Thank you very much, Oleg

Re: Linux Filesystem for Cassandra

Would you, please share, what filesystem you are using? zfs 28

Re: data size difference between supercolumn and regular column

LeveledCompaction will use less disk space(load), but need more IO. If your traffic is too high for your disk, you will have many pending compaction tasks, and large number of sstables which wait to be compacted. Also the default sstable_size_in_mb (5MB) will be too small for large data set. You

Re: Linux Filesystem for Cassandra

On 04/04/2012 08:40 AM, Oleg Proudnikov wrote: > There has been no discussion on this list on the choice of a Linux > file system for Cassandra. Does this choice make a difference? Would > you, please share, what filesystem you are using? Hopefully this is some good reading on the topic: https://

Re: Linux Filesystem for Cassandra

Thanks, Radim! What OS are you using and would ZFS be a good option under Linux on EC2? Thank you, Oleg On 2012-04-04, at 9:42 AM, Radim Kolar wrote: > >> Would you, please share, what filesystem you are using? > > zfs 28

Re: counter column family

You may have better luck with Hector specific questions on the Hector User Group https://groups.google.com/forum/?fromgroups#!forum/hector-users Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 4/04/2012, at 5:54 PM, Tamar Fraenkel wrote:

Re: server down

What version of cassandra are you using ? What java vendor / version ? What OS vendor / version ? Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 4/04/2012, at 11:33 PM, Michael Vaknine wrote: > I am recently having problems with 1 of

Re: Attempting to avoid fatal flush due to disk space

Is cleanupDirectoriesFailover able to delete the files ? When you get the error is the disk actually full ? Can you narrow this down to "i cannot delete the sstables"? (and what platform are you on). Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpi

Re: Linux Filesystem for Cassandra

Oleg: If you wanna use - ZFS - use smartos / openindiana and cassandra on top dont work around with a FUSE FS. Maybe BSD (not knowing their version of zfs / zpool) 2012/4/4 Oleg Proudnikov > Thanks, Radim! > > What OS are you using and would ZFS be a good option under Linux on EC2? > > Thank

Re: Attempting to avoid fatal flush due to disk space

Hi Aaron, On Wed, Apr 4, 2012 at 7:57 PM, aaron morton wrote: > Is cleanupDirectoriesFailover able to delete the files ? > Yes, around the time that the stack traces appear (after final teadDownClass()) you'll see my log.INFO statement and subsequent service log indicating that CassandraDaemon.s

Re: cassandra 1.08 on java7 and win7

iirc, the fix for me was to add conf to the CASSANDRA_CLASSPATH var; like so: :okClasspath REM Include the build\classes\main directory so it works in development set CASSANDRA_CLASSPATH=%CASSANDRA_HOME%\conf; %CLASSPATH%;"%CASSANDRA_HOME%\build\classes\main";"%CASSANDRA_HOME%\build\classes\t

Re: Linux Filesystem for Cassandra

On Wed, Apr 4, 2012 at 1:15 PM, Michael Widmann wrote: > If you wanna use - ZFS - use smartos / openindiana and cassandra on top > dont work around with a FUSE FS. > Maybe BSD (not knowing their version of zfs / zpool) http://zfsonlinux.org/ (I can't vouch for it, but FYI this is non-FUSE ZFS fo

Is there a way to update column's TTL only?

Hi, We would like to leverage Cassandra's expiration to manage our data's lifecycle. We need to: Delete data after a period, like: 1 hour , when user clicked the "Delete" button. We need to read and insert the column in order to update the TTL, but this is unacceptable in our system that might ne

Will Cassandra balance load across replicas?

Hi, Can any one tell me whether Cassandra can do load balancing across replicas? How to configure it for this purpose? Thanks very much. Best Regards, Zhiming

Re: server down

i am usuinc cassandra 1.0.3 java 6.0.17 on ubuntu 10.04 this is a stable version for 6 months now. On Wed, Apr 4, 2012 at 9:51 PM, aaron morton wrote: > What version of cassandra are you using ? > > What java vendor / version ? > > What OS vendor / version ? > > Cheers > > - > Aar

Re: Will Cassandra balance load across replicas?

I assume you are talking about nodes, rather than replicas. The data distribution over ring depends on Partitioner and Replica placement strategy you use. If you are using Random Partitioner and Simple Strategy, your data will be automatically distributed over the nodes in the ring. maki On 20