Re: How many BATCH inserts in to many?

2013-01-13 Thread Radim Kolar
do not use cassandra for implementing queueing system with high throughput. It does not scale because of tombstone management. Use hornetQ, its amazingly fast broker but it has quite slow persistence if you want to create queues significantly larger then your memory and use selectors for

Re: Requesting for project ideas for a group project

2013-01-13 Thread INFOMESR
Dear: It's OK, Welcome, let us start. Thx C U == www.infomesr.org ad...@infomesr.org - Message from is...@ishans.info - Date: Sun, 6 Jan 2013 09:44:23 +0530 From: Ishan Thilina is...@ishans.info Reply-To: user@cassandra.apache.org Subject: Requesting for

Re: Cassandra 1.2 Thrift and CQL 3 issue

2013-01-13 Thread Shahryar Sedghi
I finally realized that Thrift API has changed from 1.1 to 1.2 and my code and modified JDBC driver works well except I get an exception on the system log when I close the connection. Looks like it is an old issue reappearing. I have evaluated new Java driver, it is easier and more practical than

Re: How many BATCH inserts in to many?

2013-01-13 Thread aaron morton
With regard to a large number of records in a batch mutation there are some potential issues. Each row becomes a task in the write thread pool on each replica. If a single client sends 1,000 rows in a mutation it will take time for the (default) 32 threads in the write pool to work through

Re: How many BATCH inserts in to many?

2013-01-13 Thread Wei Zhu
Another potential issue is when some failure happens to some of the mutations. Is atomic batches in 1.2 designed to resolve this? http://www.datastax.com/dev/blog/atomic-batches-in-cassandra-1-2 -Wei - Original Message - From: aaron morton aa...@thelastpickle.com To: