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From Steve Loughran <ste...@apache.org>
Subject Java 1.6.0_19 & Hadoop
Date Tue, 06 Apr 2010 12:48:30 GMT

I know everyone has had bad experiences w/ Java 1.6.0_18 and was 
sticking with JVM releases they trusted, but the set of security patches 
that have come out with the _19 release change the situation. There are 
enough server-side vulnerabilities there to make upgrading something to 
consider if you are working with untrusted data.

Has anyone tried the latest release at scale and got any good/bad 
experiences to share?

One interesting feature is it does actually disable Escape Analysis, 
which I believe was one of the troublespots. When I start a JVM with the 
following options

-XX:+UseCompressedOops
-XX:+DoEscapeAnalysis
-XX:+UseParallelGC
-XX:+AggressiveOpts

On
java version "1.6.0_19"
Java(TM) SE Runtime Environment (build 1.6.0_19-b04)
Java HotSpot(TM) 64-Bit Server VM (build 16.2-b04, mixed mode)

I get told off:

Java HotSpot(TM) 64-Bit Server VM warning: Escape Analysis is disabled 
in this release.

Was it Escape Analysis that was hurting people in the _18 version?

-steve


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