Re: entire range of node out of sync -- out of the blue

Thanks! i'm also thinking a repair run without -pr could have caused this maybe ? Andras Szerdahelyi Solutions Architect, IgnitionOne | 1831 Diegem E.Mommaertslaan 20A M: +32 493 05 50 88 | Skype: sandrew84 [cid:7BDF7228-D831-4D98-967A-BE04FEB17544] On 06 Dec 2012, at 04:05, aaron morton

Re: What is substituting keys_cached column family argument

Rob, Have you played with this I have many CFs, some big some small some using large caches some using small ones, some that take many requests, some that take a few. Over time I have cooked up a strategy for how to share the cache love, even thought it may not be the "best" solution to the probl

RE: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction.

"Having so much data on each node is a potential bad day." Is this discussed somewhere on the Cassandra documentation (limits, practices etc)? We are also trying to load up quite a lot of data and have hit memory issues (bloom filter etc.) in 1.0.10. I would like to read up on big data usage

Slow Reads in Cassandra with Hadoop

Hello Cassandra users, I am trying to read and process data in Cassandra using Hadoop. I have a 4-node Cassandra cluster, and an 8-node Hadoop cluster:- 1 Namenode/Jobtracker- 7 Datanodes/Tasktrackers (4 of them are also hosting Cassandra) I am using Cassandra 1.2 beta, Hadoop 0.20.2, java 1.6_u

Re: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction.

http://wiki.apache.org/cassandra/LargeDataSetConsiderations On Thu, Dec 6, 2012 at 9:53 AM, Poziombka, Wade L < wade.l.poziom...@intel.com> wrote: > “Having so much data on each node is a potential bad day.” > > ** ** > > Is this discussed somewhere on the Cassandra documentation (limits, >

Cassandra V/S Hadoop

Hi all, Hadoop have different file system(HDFS) and Cassandra have different file system(CFS). As Hadoop have great Eco-System (Hive{Dataware House}, Hbase{Data Base} n etc..) and Cassandra(Database) it self providing its own file system Although we can run Hadoop's Ecosystem on Cassandra (If I

Re: reversed=true for CQL 3

Thanks Rob. I am on 1.1.4 now (I can go to 1.1.6 if needed) and apparently it is broken. I defined the table like this: CREATE TABLE events(interval int,id bigint,containerName varchar,objectName varchar,objectType varchar, " status int, severity int, event varchar, eventType varcha

Why Secondary indexes is so slowly by my test?

Hi guys, I found Secondary indexes too slowly in my product(amazon large instance) with cassandra, then I did test again as describe here. But the result is the same as product. What's wrong with cassandra or me? Now my test: newly installed ubuntu-12.04 LTS , apache-cassandra-1.1.6, default co

Re: how to take consistant snapshot?

For background http://wiki.apache.org/cassandra/Operations?highlight=%28snapshot%29#Consistent_backups If you it for a single node then yes there is a chance of inconsistency across CF's. If you have mulitple nodes the snashots you take on the later nodes will help. If you use CL QUOURM for r

Re: Help on MMap of SSTables

> So for memory mapped files, compaction can do a madvise SEQUENTIAL instead of > current DONTNEED flag after detecting appropriate OS versions. Will this help? AFAIK Compaction does use memory mapped file access. Cheers - Aaron Morton Freelance Cassandra Developer New Zealand

Re: entire range of node out of sync -- out of the blue

The log message matches what I would expect to see for nodetool -pr Not using pr means repair all the ranges the node is a replica for. If you have RF == number of nodes, then it will repair all the data. Cheers - Aaron Morton Freelance Cassandra Developer New Zealand @aaronmo

Re: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction.

> Meaning terabyte size databases. > Lots of people have TB sized systems. Just add more nodes. 300 to 400 Gb is just a rough guideline. The bigger picture is considering how routine and non routine maintenance tasks are going to be carried out. Cheers - Aaron Morton Freela

Re: how to take consistant snapshot?

On Thu, Dec 6, 2012 at 7:34 PM, aaron morton wrote: > For background > > > http://wiki.apache.org/cassandra/Operations?highlight=%28snapshot%29#Consistent_backups > > If you it for a single node then yes there is

Re: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction.

I think Aaron meant 300-400GB instead of 300-400MB. Thanks. -Wei - Original Message - From: "Wade L Poziombka" To: user@cassandra.apache.org Sent: Thursday, December 6, 2012 6:53:53 AM Subject: RE: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction. “ Having so muc

Re: Freeing up disk space on Cassandra 1.1.5 with Size-Tiered compaction.

+1 On Dec 6, 2012, at 10:06 PM, "Wei Zhu" wrote: > I think Aaron meant 300-400GB instead of 300-400MB. > > Thanks. > -Wei > > - Original Message - > From: "Wade L Poziombka" > To: user@cassandra.apache.org > Sent: Thursday, December 6, 2012 6:53:53 AM > Subject: RE: Freeing up disk sp

Re: Cassandra V/S Hadoop

 Hello Yogesh,  Actualy you have missunderstand Hadoop.  Hadoop - it's framework for distributed computing, consist of two main module HDFS and Map Reduce. Hadoop HDFS is a distributed file system and Map reduce module can help you to parallel processing of large data sets (batch processing).  C