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From Vladimir Rodionov <vrodio...@carrieriq.com>
Subject RE: Heap fragmentation
Date Thu, 20 Jan 2011 18:34:39 GMT
BigMemory anyone?


Best regards,
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: vrodionov@carrieriq.com

From: Todd Lipcon [todd@cloudera.com]
Sent: Thursday, January 20, 2011 9:33 AM
To: dev
Subject: Heap fragmentation

I did some experiments to understand our full GC issues better last night.
Here are the results:

<http://people.apache.org/~todd/hbase-fragmentation/>Basically my conclusion
here is that (for these YCSB workloads) the memstore is way worse for heap
fragmentation than the block cache.

Also we now have some tools and reference for comparison if we make any
changes to memstore to try to combat this issue.

Todd Lipcon
Software Engineer, Cloudera

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