Eliminating GC hell would probably do a lot to help Cassandra maintain speed vs periods of superfast/superslow performance. I look forward to hearing how this experiment goes.
From: Eric Hauser [mailto:ewhau...@gmail.com] Sent: Friday, April 23, 2010 3:37 PM To: user@cassandra.apache.org Subject: Re: Trove maps According to their license page, it is LGPL. On Fri, Apr 23, 2010 at 4:25 PM, Avinash Lakshman <avinash.laksh...@gmail.com<mailto:avinash.laksh...@gmail.com>> wrote: I think the GPL license of Trove prevents us from using it in Cassadra. But yes for all its maps it uses Open Addressing which is much more memory efficient than linear chaining that is employed in the JDK. Avinash On Fri, Apr 23, 2010 at 1:22 PM, Carlos Sanchez <carlos.sanc...@riskmetrics.com<mailto:carlos.sanc...@riskmetrics.com>> wrote: I will try to modify the code... what I like about Trove is that even for regular maps (non primitive) there are no Entry objects created so there are much less references to be gced On Apr 23, 2010, at 2:55 PM, Jonathan Ellis wrote: > From what I have seen Trove is only a win when you are doing Maps of > primitives, which is mostly not what we use in Cassandra. (The one > exception I can think of is a map of int -> columnfamilies in > CommitLogHeader. You're welcome to experiment and see if using Trove > there or elsewhere makes a measurable difference with stress.py.) > > -Jonathan > > On Fri, Apr 23, 2010 at 2:50 PM, Carlos Sanchez > <carlos.sanc...@riskmetrics.com<mailto:carlos.sanc...@riskmetrics.com>> wrote: >> Jonathan, >> >> Have you thought of using Trove collections instead of regular java >> collections (HashMap / HashSet) in Cassandra? Trove maps are faster and >> require less memory >> >> Carlos >> >> This email message and any attachments are for the sole use of the intended >> recipients and may contain proprietary and/or confidential information which >> may be privileged or otherwise protected from disclosure. Any unauthorized >> review, use, disclosure or distribution is prohibited. If you are not an >> intended recipient, please contact the sender by reply email and destroy the >> original message and any copies of the message as well as any attachments to >> the original message. >> This email message and any attachments are for the sole use of the intended recipients and may contain proprietary and/or confidential information which may be privileged or otherwise protected from disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not an intended recipient, please contact the sender by reply email and destroy the original message and any copies of the message as well as any attachments to the original message.
