Connect Cassandra rings in datacenter and ec2

2014-04-29 Thread Trung Tran
Hi, We're planning to deploy 3 cassandra rings, one in our datacenter (with more node/power) and two others in EC2. We don't have enough public IP to assign for each individual node in our data center, so i wonder how could we connect the cluster together? Have any one tried this before, and if t

Re: Cassandra/Hadoop only write few columns

2011-01-18 Thread Trung Tran
ode, but you are repeating colName2 . Can you log > the mutation list before you write it and confirm you have unique column > names? > > Can you turn up the logging to DEBUG for the hadoop job and the Cassandra > cluster to see what's happening? > > Aaron > > On

Cassandra/Hadoop only write few columns

2011-01-18 Thread Trung Tran
Hi, I'm working on ColumnFamilyOutputFormat and for some reasons my reduce class does not write all columns to cassandra. I tried to modify mapreduce.output.columnfamilyoutputformat.batch.threshold with some different values (1, 8, .. etc) but no thing changes. What i'm having in my reduce class

Re: Newbie question on Cassandra mem usage

2010-11-22 Thread Trung Tran
Hi, Is it the min_compaction_threshold and max_compaction_threshold? Do i need to lower the memtable setting also? Thanks, Trung. On Mon, Nov 22, 2010 at 12:02 PM, Jonathan Ellis wrote: > Set your columnfamily thresholds lower. > > On Mon, Nov 22, 2010 at 12:45 PM, Trung Tran wro

Re: Newbie question on Cassandra mem usage

2010-11-22 Thread Trung Tran
a > nodes you have, how many clients you are running against it and how fast > they are writing. > Aaron > > On 23 Nov, 2010,at 07:45 AM, Trung Tran wrote: > > Hi, > > I have a test cluster of 3 nodes, 14Gb of mem in each node, > replication factor = 3. With default -Xm

Newbie question on Cassandra mem usage

2010-11-22 Thread Trung Tran
Hi, I have a test cluster of 3 nodes, 14Gb of mem in each node, replication factor = 3. With default -Xms and Xmx, my nodes are set to have max-heap-size = 7Gb. After initial load with about 200M rows (write with hector default consistencylevel = quorum,) my nodes memory usage are up to 13.5Gb, sh