Compression Meta data is also off heap http://www.datastax.com/dev/blog/performance-improvements-in-cassandra-1-2
Cheers ----------------- Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 17/04/2013, at 3:02 AM, Jay Svc <jaytechg...@gmail.com> wrote: > Thanks Edward.! > > > > On Fri, Apr 12, 2013 at 9:46 AM, Edward Capriolo <edlinuxg...@gmail.com> > wrote: > This issue describes the design of the arena allocation of memtabes. > https://issues.apache.org/jira/browse/CASSANDRA-2252 > > > On Fri, Apr 12, 2013 at 1:35 AM, Viktor Jevdokimov > <viktor.jevdoki...@adform.com> wrote: > Memtables resides in heap, write rate impacts GC, more writes - more frequent > and longer ParNew GC pauses. > > > From: Jay Svc [mailto:jaytechg...@gmail.com] > Sent: Friday, April 12, 2013 01:03 > To: user@cassandra.apache.org > Subject: Does Memtable resides in Heap? > > Hi Team, > > I have got this 8GB of RAM out of that 4GB allocated to Java Heap. My > question is the size of Memtable does it contribute to heap size? or they are > part of off-heap? > > Does bigger Memtable would have impact on GC and overall memory management? > > I am using DSE 3.0 / Cassandra 1.1.9. > > Thanks, > Jay > > Best regards / Pagarbiai > > Viktor Jevdokimov > Senior Developer > > Email: viktor.jevdoki...@adform.com > Phone: +370 5 212 3063 > Fax: +370 5 261 0453 > > J. Jasinskio 16C, > LT-01112 Vilnius, > Lithuania > > > > Disclaimer: The information contained in this message and attachments is > intended solely for the attention and use of the named addressee and may be > confidential. If you are not the intended recipient, you are reminded that > the information remains the property of the sender. You must not use, > disclose, distribute, copy, print or rely on this e-mail. If you have > received this message in error, please contact the sender immediately and > irrevocably delete this message and any copies. > >
