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From Todd Lipcon <t...@cloudera.com>
Subject Re: Java 1.6.0_19 & Hadoop
Date Tue, 06 Apr 2010 15:44:40 GMT
I was seeing errors in 18 without escape analysis explicitly enabled. So
unless it became enabled by default in 18, I don't think that was the issue.

-Todd

On Tue, Apr 6, 2010 at 5:48 AM, Steve Loughran <stevel@apache.org> wrote:

>
> 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
>
>


-- 
Todd Lipcon
Software Engineer, Cloudera

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