Re: Performance issues with CQL3 collections?

As documented at http://cassandra.apache.org/doc/cql3/CQL.html#collections, the lists have 3 operations that require a read before a write (and should thus be avoided in performance sensitive code), namely setting and deleting by index, and removing by value. Outside of that, collections involves n

RE: Problems with node rejoining cluster

I am re-installing on the same machine (the IP stays the same), but need to wipe all the disks for the OS switch. When you say copy all the data and config in step 2 below, is that for backup reasons, or do I need to actually copy it back manually to the box? When the node joins back the clust

Re: Performance issues with CQL3 collections?

IMHO, having many tombstones can slow down reads and writes in the following cases : - For reads, it is slow if the requested slice contains many tombstones - For writes, it is is slower if the row in the memtable contains many tombstones. It's because, if the IntervalTree contains N intervals,

Re: Errors while upgrading from 1.1.10 version to 1.2.4 version

Hello, Have a look at : https://issues.apache.org/jira/browse/CASSANDRA-5476 2013/6/28 Ananth Gundabattula > Hello Everybody, > > We were performing an upgrade of our cluster from 1.1.10 version to 1.2.4 > . We tested the upgrade process in a QA environment and found no issues. > However in th

Cluster processing not balanced

Hi All, I have the following situation: - Cassandra 1.0.11 - A 6 node cluster - Random partitioner - Tokens are balanced (according to node-tool) - Data-load is balanced (according to node-tool) I have a customers column-family with 100 customers. I also have a test client which requests ran

Re: Cluster processing not balanced

I found the issue. Stupid mistake. Although I have 100 customers in the cluster, I do a get_range_slices to get the first 1 customers. I use these customers as a seed for my test program. I random select customers from that set and fire requests at the cluster. Those 1 customers all r

Re: Cassandra as storage for cache data

> https://issues.apache.org/jira/browse/CASSANDRA-2958 Thanks - Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 28/06/2013, at 6:30 AM, Robert Coli wrote: > On Wed, Jun 26, 2013 at 9:51 PM, aaron morton wrote: >> WARNING: di

Re: CompactionExecutor holds 8000+ SSTableReader 6G+ memory

> Lots of memory are consumed by the SSTableReader's cache The file cache is managed by the OS. However the SSTableReader will have bloom filters and compression meta data, both off heap in 1.2. The Key and Row caches are global so not associated with any one SStable. Cheers

Re: Problems with node rejoining cluster

> When you say copy all the data and config in step 2 below, is that for backup > reasons, or do I need to actually copy it back manually to the box? That was to move to another box, but you can use the same process to re-build the box. Just get the data and config off the node then put it back.

Re: about FlushWriter "All time blocked"

>> We do not use secondary indexes or snapshots Out of interest how many CF's do you have ? Cheers - Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 28/06/2013, at 7:52 AM, Nate McCall wrote: > Non-zero for pending tasks is