Re: backing up data from cassandra

2009-10-29 Thread Chris Were
Is it possible to only backup selected column families? On Wed, Oct 7, 2009 at 8:15 AM, Jonathan Ellis jbel...@gmail.com wrote: I don't really see nodeprobe snapshot and mv snapshotdir/* livedir as all that much harder, but maybe that's just me. for a cluster, just add dsh. -Jonathan On

Re: backing up data from cassandra

2009-10-29 Thread Jonathan Ellis
programatically, yes, but nodeprobe doesn't expose that yet. Feel free to create a ticket. On Thu, Oct 29, 2009 at 4:20 AM, Chris Were chris.w...@gmail.com wrote: Is it possible to only backup selected column families? On Wed, Oct 7, 2009 at 8:15 AM, Jonathan Ellis jbel...@gmail.com wrote: I

Re: Multi data-center configuration

2009-10-29 Thread Jonathan Ellis
Try with one seed from each DC. On Thu, Oct 29, 2009 at 8:19 AM, Musto Domenico domenico.mu...@yoox.comwrote: Hi there, we are experiencing a problem with a multidatacenter configuration. We have the following scenario : We have two data-centers with 3 nodes each. We have

RE: Multi data-center configuration

2009-10-29 Thread Musto Domenico
Hi, we already tried putting the same seeds list on each DC but it did not work Thanks From: Jonathan Ellis [mailto:jbel...@gmail.com] Sent: giovedì 29 ottobre 2009 17.06 To: cassandra-user@incubator.apache.org Subject: Re: Multi data-center configuration the seeds list needs to

Re: How to store tree structure in Cassandra

2009-10-29 Thread Vijay
earlier, I was working on something similar to that... Some one has done some work based on Hbase try this: http://dev.day.com/discussion-groups/content/lists/jackrabbit-dev/2009-02/2009-02-19_Jackrabbit_on_Hadoop_Marcel_Reutegger.html similar thing can be done on cassandra, if you looking at

Re: Multi data-center configuration

2009-10-29 Thread Jonathan Ellis
Try using just a single seed then. On Thu, Oct 29, 2009 at 10:09 AM, Musto Domenico domenico.mu...@yoox.comwrote: Hi, we already tried putting the same seeds list on each DC but it did not work Thanks *From:* Jonathan Ellis [mailto:jbel...@gmail.com] *Sent:* giovedì 29 ottobre

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Edmond Lau
On Thu, Oct 29, 2009 at 1:20 PM, Jonathan Ellis jbel...@gmail.com wrote: On Thu, Oct 29, 2009 at 1:18 PM, Edmond Lau edm...@ooyala.com wrote: I have a freshly started 3-node cluster with a replication factor of 2. If I take down two nodes, I can no longer do any writes, even with a

Re: HBase vs. Cassandra: new article!

2009-10-29 Thread Jonathan Ellis
is this guy serious? Cassandra relies mostly on Key-Value pairs for storage? news to me. On Thu, Oct 29, 2009 at 2:51 PM, Michael Greene michael.gre...@gmail.com wrote: Forwarding this along: -- Forwarded message -- From: Bradford Stephens bradfordsteph...@gmail.com Date:

Re: HBase vs. Cassandra: new article!

2009-10-29 Thread Chris Were
Any chance of posting the factual errors publicly? Even in an abbreviated form on the wiki under common misconceptions or similar would be useful. Such a list would potentially be useful to new cassandra users and also debunk myths that come about as a result of articles like this, or even

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Edmond Lau
I've updated to trunk, and I'm still hitting the same issue but it's manifesting itself differently. Again, I'm running with a freshly started 3-node cluster with a replication factor of 2. I then take down two nodes. If I write with a consistency level of ONE on any key, I get an

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Jonathan Ellis
I've seen that bug too. I think we introduced a regression with CASSANDRA-492. On Thu, Oct 29, 2009 at 3:37 PM, Edmond Lau edm...@ooyala.com wrote: I've updated to trunk, and I'm still hitting the same issue but it's manifesting itself differently.  Again, I'm running with a freshly started

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Edmond Lau
Will do. On Thu, Oct 29, 2009 at 2:39 PM, Jonathan Ellis jbel...@gmail.com wrote: can you create a ticket for this? On Thu, Oct 29, 2009 at 3:39 PM, Jonathan Ellis jbel...@gmail.com wrote: I've seen that bug too.  I think we introduced a regression with CASSANDRA-492. On Thu, Oct 29, 2009

Re: HBase vs. Cassandra: new article!

2009-10-29 Thread Jonathan Ellis
Okay, here are some corrections. It's a bit choppy because it's just that; a list of corrections. Again, this is just trying to address factual errors; I disagree with many of the expressed opinions, too. :) Cassandra relies mostly on Key-Value pairs for storage No more than hbase does.

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Edmond Lau
CASSANDRA-524 On Thu, Oct 29, 2009 at 2:56 PM, Edmond Lau edm...@ooyala.com wrote: Will do. On Thu, Oct 29, 2009 at 2:39 PM, Jonathan Ellis jbel...@gmail.com wrote: can you create a ticket for this? On Thu, Oct 29, 2009 at 3:39 PM, Jonathan Ellis jbel...@gmail.com wrote: I've seen that bug

Re: HBase vs. Cassandra: new article!

2009-10-29 Thread Sal Fuentes
Thanks for taking the time to contribute these corrections Jonathan. I second Mr. Were's idea of perhaps having a wiki where we can host actual and current facts as oppose to a blog post (that will hardly be updated as time passes but will continue to perpetuate) about outdated and perhaps biased

Updates to DC Quorum

2009-10-29 Thread Vijay
*Hi Jonathan,* Have some updates to be patched on Cassandra, earlier one did not work and hope this fixes it. Thanks and Regards, /VJ cassandra-DCAWARE.patch Description: Binary data

Re: Updates to DC Quorum

2009-10-29 Thread Jonathan Ellis
can you post to jira please? thanks! On Thu, Oct 29, 2009 at 5:00 PM, Vijay vijay2...@gmail.com wrote: Hi Jonathan, Have some updates to be patched on Cassandra, earlier one did not work and hope this fixes it. Thanks and Regards, /VJ

Re: can't write with consistency level of one after some nodes fail

2009-10-29 Thread Jonathan Ellis
Attached a fix in jira that should fix it. On Thu, Oct 29, 2009 at 4:00 PM, Edmond Lau edm...@ooyala.com wrote: CASSANDRA-524 On Thu, Oct 29, 2009 at 2:56 PM, Edmond Lau edm...@ooyala.com wrote: Will do. On Thu, Oct 29, 2009 at 2:39 PM, Jonathan Ellis jbel...@gmail.com wrote: can you