Cassandra on Red Hat 6.3

I followed step-by-step instructions for installing Cassandra on Red Hat Linux Server 6.3 from the datastax site, without much success. Apparently it installs fine but starting cassandra service does nothing(no ports are bound so opscenter/cli doesnt work). When I check service's status, it shows "

Re: NPE in running "ClientOnlyExample"

I hope you have already gone through this link * https://github.com/zznate/hector-examples*. If not will suggest you to go through, and you can also refer http://hector-client.github.com/hector/build/html/documentation.html. Best Regards, On Mon, Feb 18, 2013 at 12:15 AM, Jain Rahul wrote: >

Re: cassandra vs. mongodb quick question

  Just out of curiosity : When using compression, does this affect this one way or another?  Is 300G (compressed) SSTable size, or total size of data?    .vegard, - Original Message - From: user@cassandra.apache.org To: Cc: Sent:Mon, 18 Feb 2013 08:41:25 +1300 Sub

Firewall logging to Cassandra

Hi, Is anyone using Cassandra to store firewall logs ? If so any points to share? Regards Hans-Peter Hans-Peter Sloot Oracle Technical Expert Oracle 10g/11g Certified Master Global Fact ATS NL T + 31 6 303 83 499 [atos_logotype] Dit bericht is vertrouwelijk en kan geheime informatie bev

RE: Mutation dropped

Thanks Aaron. Does the rpc_timeout not control the client timeout ? Is there any param which is configurable to control the replication timeout between nodes ? Or the same param is used to control that since the other node is also like a client ? From: aaron morton [mailto:aa...@thelastpickle

Re: Nodetool doesn't shows two nodes

I think it is actually more of a problem that there were no error messages or other indication of what went wrong in the setup where the nodes couldn't contact. Should I file issue report on this? Clearly Cassandra must have tried to contact some IP on port 7000 and failed. Why didn't it log? That

Re: Cassandra Geospatial Search

We have not quite gotten to it yet and has been driven by paying customers at this time and there is one customer who wants it but they themselves keep pushing it out for other things they want. Thanks, Dean On 2/15/13 4:16 PM, "Drew Kutcharian" wrote: >Hey Dean, do you guys have any thoughts o

Re: Nodetool doesn't shows two nodes

These issues are more cloud specific then they are cassandra specific. Cloud executives tell me in white papers that cloud is awesome and you can fire all your sysadmins and network people and save money. This is what happens when you believe cloud executives and their white papers, you spend 10+

Re: Nodetool doesn't shows two nodes

I don't think it is cloud at all, and I am no newcomer to sysadmin (though am relative new to AWS cloud). The mistake is clearly mine, but also clearly easy to make -- so I assume a lot of other people must make it too. But the logs don't provide any guidance. Or is this another mistake I make, whi

Re: Both nodes own 100% of cluster

Why have u assigned for both nodes a genenerated token? And how you calculated it? Shouldnt u choose one of them to has its token as the '0' start value? At least that is what is said on the tutorials I've read. On Mon, Feb 18, 2013 at 2:55 PM, Boris Solovyov wrote: > What does the it mean that

Re: Both nodes own 100% of cluster

These are running the latest Cassandra 1.2 with 256 vnodes each. On Mon, Feb 18, 2013 at 2:07 PM, Víctor Hugo Oliveira Molinar < vhmoli...@gmail.com> wrote: > Why have u assigned for both nodes a genenerated token? And how you > calculated it? > > Shouldnt u choose one of them to has its token a

Re: Both nodes own 100% of cluster

I don't know cassandra 1.2 very well, 100% of effective own probably probably means that you're running with RF = number of nodes. Alain 2013/2/18 Boris Solovyov > These are running the latest Cassandra 1.2 with 256 vnodes each. > > > On Mon, Feb 18, 2013 at 2:07 PM, Víctor Hugo Oliveira Moli

Re: Both nodes own 100% of cluster

Yes, for instance I have 6 nodes and have 50% ownership because I have RF=3, and 6/3 = 2 virtual entities that are written to which means each node owns 50%. Dean From: Alain RODRIGUEZ mailto:arodr...@gmail.com>> Reply-To: "user@cassandra.apache.org" mailto:use

Re: Both nodes own 100% of cluster

That makes sense, thanks. On Mon, Feb 18, 2013 at 2:26 PM, Hiller, Dean wrote: > Yes, for instance I have 6 nodes and have 50% ownership because I have > RF=3, and 6/3 = 2 virtual entities that are written to which means each > node owns 50%.

Re: Deleting old items during compaction (WAS: Deleting old items)

Sorry, missed the Counters part. You are probably interested in this one https://issues.apache.org/jira/browse/CASSANDRA-5228 Add your need to ticket to help it along. IMHO if you have write once, read many time series data the SSTables are effectively doing horizontal partitioning for you. So

Re: nodetool repair with vnodes

> So, running it periodically on just one node is enough for cluster > maintenance ? In the special case where you have RF == Number of nodes. The recommended approach is to use -pr and run it on each node periodically. > Also: running it with -pr does output: That does not look right. There

Re: Cassandra on Red Hat 6.3

Nothing jumps out. Check /var/log/cassandra/output.log , that's where stdout and std err are directed. Check file permissions. Cheers - Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 18/02/2013, at 9:08 PM, amulya rattan

Re: NPE in running "ClientOnlyExample"

An you can never go wrong relying on the documentation for the python pycassa library, it has some handy tutorials for getting started. http://pycassa.github.com/pycassa/ cheers - Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com

Re: cassandra vs. mongodb quick question

My experience is repair of 300GB compressed data takes longer than 300GB of uncompressed, but I cannot point to an exact number. Calculating the differences is mostly CPU bound and works on the non compressed data. Streaming uses compression (after uncompressing the on disk data). So if you ha

Re: Firewall logging to Cassandra

You may be interested in something like this for connecting to flume https://github.com/thobbs/flume-cassandra-plugin There is probably something similar for kafka out there. Cheers - Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.

Re: Cassandra on Red Hat 6.3

It's throwing MalformedURLException Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: ip-10-0-0-228: ip-10-0-0-228 Where should I set the correct IP of the machine? 2013/2/19 aaron morton > Nothing jumps out. > > C

Re: Deleting old items during compaction (WAS: Deleting old items)

"However the old rows will not be purged from disk unless all fragments of the row are involved in a compaction process. So it may take some time to purge from disk, depending on the workload. " http://wiki.apache.org/cassandra/Counters The doc says: "Counter removal is intrinsically limited. For

Re: cassandra vs. mongodb quick question(good additional info)

I thought about this more, and even with a 10Gbit network, it would take 40 days to bring up a replacement node if mongodb did truly have a 42T / node like I had heard. I wrote the below email to the person I heard this from going back to basics which really puts some perspective on it….(and a

Cassandra backup

Hi - We have a req to store around 90 days of data per user. Last 7 days of data is going to be accessed frequently. Is there a way we can have the recent data (7 days) in SSD and the rest of the data in the HDD ? Do we take a snapshot every 7 days and use a separate 'archive' cluster to serve t

Re: Cassandra backup

There is this: http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-1-flexible-data-file-placement But you'll need to design your data model around the fact that this is only as granular as 1 column family Best, michael From: Kanwar Sangha mailto:kan...@mavenir.com>> Reply-To: "user@cassa

RE: Cassandra backup

Thanks. I will look into the details. One issue I see is that if I have only one column family which needs only the last 7 days data to be on SSD and the rest to be on the HDD, how will that work. From: Michael Kjellman [mailto:mkjell...@barracuda.com] Sent: 18 February 2013 20:08 To: user@cassa

Re: Cassandra on Red Hat 6.3

On 02/18/2013 03:07 PM, amulya rattan wrote: > It's throwing MalformedURLException > > Error: Exception thrown by the agent : java.net.MalformedURLException: > Local host name unknown: java.net.UnknownHostException: ip-10-0-0-228: > ip-10-0-0-228 > > Where should I set the correct IP of the machi