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imabonehead
Greg Luck's WebLog: Performance problems in ConcurrentHashMap vs synchronized HashMap - http://gregluck.com/blog...
"In Ehcache 1.6, HashMap was replaced with ConcurrentHashmap with statistical sampling for eviction. Having completed 1.6 and released it there were a few surprises along the way with ConcurrentHashMap performance." - imabonehead from Bookmarklet