RE: unbalanced ring

To run, or not to run? All this depends on use case. There're no problems running major compactions (we do it nightly) in one case, there could be problems in another. Just need to understand, how everything works. Best regards / Pagarbiai Viktor Jevdokimov Senior Developer Email: viktor.jevdo

Re: unbalanced ring

Tamar be carefull. Datastax doesn't recommand major compactions in production environnement. If I got it right, performing major compaction will convert all your SSTables into a big one, improving substantially your reads performence, at least for a while... The problem is that will disable minor

cassandra 1.0.8 memory usage

Hi guys, I am running a mini cluster with 6 nodes, recently we see very frequent ParNewGC on two nodes. It takes 200 - 800 ms on average, sometimes it takes 5 seconds. You know, hte ParNewGC is stop-of-wolrd GC and our client throws SocketTimeoutException every 3 minutes. I checked the load, it s

Re: 1.1.1 is "repair" still needed ?

On Tue, Oct 9, 2012 at 12:56 PM, Oleg Dulin wrote: > My understanding is that the repair has to happen within gc_grace period. > [ snip ] > So the question is, is this still needed ? Do we even need to run nodetool > repair ? If Hinted Handoff works in your version of Cassandra, and that version

Re: READ messages dropped

Hi! Thanks for the answer. I don't see much change in the load this Cassandra cluster is under, so why is the sudden surge of such messages? What I did noticed while looking at the logs (which are also running OpsCenter), is that there is some correlation between the dropped reads and flushes of Op

Re: unbalanced ring

it should not have any other impact except increased usage of system resources. and i suppose, cleanup would not have an affect (over normal compaction) if all nodes contain the same data On Wed, Oct 10, 2012 at 12:12 PM, Tamar Fraenkel wrote: > Hi! > Apart from being heavy load (the compact), w

Re: How to replace a dead *seed* node while keeping quorum

I witnessed the same behavior as reported by Edward and James. Removing the host from its own seed list does not solve the problem. Removing it from config of all nodes and restarting each, then restarting the failed node worked. Ron On Sep 12, 2012, at 4:42 PM, Edward Sargisson wrote: > I'

Re: unbalanced ring

Hi! Apart from being heavy load (the compact), will it have other effects? Also, will cleanup help if I have replication factor = number of nodes? Thanks *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 F

Re: Upgrading hardware on a node in a cluster

if you have N nodes in your cluster, add N new nodes using the new hardware, then decommision the old N nodes. (and migrate to VPC like dean said) On Wed, Oct 10, 2012 at 5:23 AM, Hiller, Dean wrote: > Well, you could use amazon VPC in which case you DO pick the IP yourself > ;)….it makes life

Re: unbalanced ring

major compaction in production is fine, however it is a heavy operation on the node and will take I/O and some CPU. the only time i have seen this happen is when i have changed the tokens in the ring, like "nodetool movetoken". cassandra does not auto-delete data that it doesn't use anymore just

Re: cassandra 1.2 beta in production

https://issues.apache.org/jira/browse/CASSANDRA/fixforversion/12323284 On Wed, Oct 10, 2012 at 1:41 AM, Alexey Zotov wrote: > Hi Guys, > > What known critical bugs are there that couldn't allow to use 1.2 beta 1 in > production? > We don't use cql and secondary indexes. > > > -- > > Best regards

Re: Attempting to load already loaded column family during startup

I know what happened here. The node encountering exception during startup is 1.2 while there is another node of 1.2-beta2. https://issues.apache.org/jira/browse/CASSANDRA-4416 includes metadata for system keyspace itself in schema_* tables. Hence, when both nodes were up, 1.2-beta2 node streamed th

Re: 1000's of CF's.

I do believe they could solve this if they wanted to. We are now streaming 5000 virtual CF's into one CF with PlayOrm. Our plan now is to use storm to do the processing in place of map/reduce. Each virtual CF can also be partitioned(you choose the column that is the partition key). So I woul

Re: Upgrading hardware on a node in a cluster

Well, you could use amazon VPC in which case you DO pick the IP yourself ;)….it makes life a bit easier. Dean From: Martin Koch mailto:m...@issuu.com>> Reply-To: "user@cassandra.apache.org" mailto:user@cassandra.apache.org>> Date: Wednesday, October 10, 2012 3:

Re: Option for ordering columns by timestamp in CF

I think that would be cool. /Martin Koch - Issuu - Senior Software Architect On Wed, Oct 10, 2012 at 11:44 AM, Ertio Lew wrote: > I think Cassandra should provide an configurable option on per column > family basis to do columns sorting by time-stamp rather than column names. > This would be re

Re: can I have a mix of 32 and 64 bit machines in a cluster?

On Tuesday 09 of October 2012, Brian Tarbox wrote: > I can't imagine why this would be a problem but I wonder if anyone has > experience with running a mix of 32 and 64 bit nodes in a cluster. We are running mixed userspace 64/32bit (all kernels 64bit) linux 1.0.10 cluster for our daily operatio

Re: Option for ordering columns by timestamp in CF

I think Cassandra should provide an configurable option on per column family basis to do columns sorting by time-stamp rather than column names. This would be really helpful to maintain time-sorted columns without using up the column name as time-stamps which might otherwise be used to store most r

Re: 1000's of CF's.

Main problem that this "sweet spot" is very narrow. We can't have lots of CF, we can't have long rows and we end up with enormous amount of huge composite row keys and stored metadata about that keys (keep in mind overhead on such scheme, but looks like that nobody really cares about it anymore

Upgrading hardware on a node in a cluster

Hi List I'd like to migrate my nodes in a cluster to new hardware, moving one node at a time. I'm running the cluster in Amazon, so I don't get to pick the ip number of each host myself. I'd like to decommision, say, the node with token 0, and bring that node up on the new hardware (which will h

Re: unbalanced ring

Hi, Same thing here: 2 nodes, RF = 2. RCL = 1, WCL = 1. Like Tamar I never ran a major compaction and repair once a week each node. 10.59.21.241eu-west 1b Up Normal 133.02 GB 50.00% 0 10.58.83.109eu-west 1b Up Normal 98.12 GB 50.00%

cassandra 1.2 beta in production

Hi Guys, What known critical bugs are there that couldn't allow to use 1.2 beta 1 in production? We don't use cql and secondary indexes. -- Best regards** Zotov Alexey Grid Dynamics Skype: azotcsit

Re: unbalanced ring

Hi! I am re-posting this, now that I have more data and still *unbalanced ring*: 3 nodes, RF=3, RCL=WCL=QUORUM Address DC RackStatus State Load OwnsToken 113427455640312821154458202477256070485 x.x.x.xus-east 1c Up Normal 24.02 GB33.33