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From: Michael Bieniosek <michael@powerset.com>
To: "hadoop-user@lucene.apache.org" <hadoop-user@lucene.apache.org>, Doug
 Cutting <cutting@apache.org>
Date: Fri, 12 Oct 2007 12:00:56 -0700
Subject: Re: jdk6 on darwin
Thread-Topic: jdk6 on darwin
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Ah, okay.  I thought Owen was suggesting that we move to requiring java 1.6=
 for compilation or runtime, but it appears it is still a little early for =
that in terms of availability of java 1.6.

-Michael

On 10/12/07 11:34 AM, "Doug Cutting" <cutting@apache.org> wrote:

Colin Evans wrote:
> I'm a bit confused by this discussion though.  How would compiling the
> jars with Java 1.5 and running on 1.6 degrade performance (assuming that
> the jars don't use any new 1.6 APIs)?

It won't.  The claim is just that running with Java 1.5 degrades
performance significantly.  The source code is compatible with Java 1.5,
and code compiled with Java 1.5 runs efficiently in Java 1.6.

So recompilation will make 0.14.2 work in Java 1.5 and Java 1.6.  This
has been the way we normally produce Hadoop releases: compile with Java
1.5 and recommend Java 1.6 as the runtime.  I made a mistake when
building 0.14.2, and used Java 1.6 to compile it, and no one noticed
until after the release was published.

The question is whether this warrants a 0.14.3 release, compiled with
Java 1.5.  I'm currently leaning that way.

Doug


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