commitlog partition

I'm spec'ing out some hardware for a small cassandra cluster. I know the recommendation (v1.2+) on spinning media is to have the commitlog on a separate physical disk from the data, but is it considered ok for performance to put the commitlog on a partition of the OS's disk?

too slow to generate sstable with SSTableSimpleUnsortedWriter for composite key structure

Hi, I try to generate sstable for bulk insert. generated table for composite key is nearly x1000 times slower than single primary key. Is there a trick to speed up generation of sstable for composite key? Thanks Koray

Re: Read query slows down when a node goes down

For how long does the read latencies go up once a machine is down? It takes a configurable amount of time for machines to detect that another machine is down. This is done through Gossip. The algo to detect failures is The Phi accrual failure detector. Regarding your question, if you are

Re: Read query slows down when a node goes down

Repair should not take that long since you have very less data. Check the logs of other machines with which it is repairing to find anything interesting. On Mon, Sep 16, 2013 at 10:15 AM, Parag Patel parag.pa...@fusionts.comwrote: Thanks. I’ve noticed that a repair takes a long to time to

Tune MemTable per column Family

Is there a way to limit the Memtable sizes on a columnFamily basis on cassandra 1.1.x ? I have some CF that have very very low throughput and I'd like to lower the amount of data in memory to keep the Heap size down. Thanks

Re: How can I switch from multiple disks to a single disk?

I think you can do by moving all the sstables under one drive. I am not sure though. The sstables names should be unique across drives. On Mon, Sep 16, 2013 at 10:14 AM, Juan Manuel Formoso jform...@gmail.comwrote: Because I ran out of space when shuffling, I was forced to add multiple disks

Re: Tune MemTable per column Family

On Mon, Sep 16, 2013 at 12:01 PM, Philippe watche...@gmail.com wrote: Is there a way to limit the Memtable sizes on a columnFamily basis on cassandra 1.1.x ? I have some CF that have very very low throughput and I'd like to lower the amount of data in memory to keep the Heap size down. No.

RE: Complex JSON objects

Thanks to you and Paolo an Edward. You’ve given me something to think about. I’ll just have to figure out the most reasonable approach for my needs. Les From: Laing, Michael [mailto:michael.la...@nytimes.com] Sent: Wednesday, September 11, 2013 2:39 PM To: user@cassandra.apache.org Subject: Re:

questions related to the SSTable file

Hi, I have some questions related to the SSTable in the Cassandra, as I am doing a project to use it and hope someone in this list can share some thoughts. My understand is the SSTable is per column family. But each column family could have multi SSTable files. During the runtime, one row COULD

Re: questions related to the SSTable file

Hi, 1) I will expect same row key could show up in both sstable2json output, as this one row exists in both SSTable files, right? Yes. 2) If so, what is the boundary? Will Cassandra guarantee the column level as the boundary? What I mean is that for one column's data, it will be