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https://issues.apache.org/jira/browse/LUCENE-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072437#comment-13072437
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Uwe Schindler commented on LUCENE-3349:
---------------------------------------
Should I also send this mail to [email protected], so press/journalists also
get the information? This would maybe make Oracle work faster :-)
> Place warning about today's released Java7 version on Lucene/Solr/Root
> webpage's news and send mail to java-user
> ----------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3349
> URL: https://issues.apache.org/jira/browse/LUCENE-3349
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: general/website
> Environment: Java7
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
>
> Today, JDK/JRE 1.7.0 GA was released by Oracle. Unfortunately they didn't fix
> the Hotspot problems affecting loops to be miscompiled (LUCENE-3335,
> LUCENE-3346). This can lead to Solr crashing with default configuration on
> startup or sudden index corrumption depending on configuration.
> We should send an email to the java-user and solr-user list describing the
> problem. Also place a note in the news section of Solr, Lucene Core and
> top-level website.
> I propose the following text:
> {quote}
> *Jul 28th, 2011: WARNING*
> Oracle released *Java 7* today. Unfortunately it contains some hotspot
> compiler optimizations, which miscompile some loops in Lucene's code (this
> affects all versions released until today, see Hotspot bug
> [http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7070134]). Solr users
> with the default configuration will have Java crashing with SIGSEGV as soon
> as they start to index documents, as one affected part is the well-known
> Porter stemmer (see LUCENE-3335). Other loops in Lucene may be miscompiled,
> too, leading to index corruption (especially on Lucene trunk with pulsing
> codec; other loops may be affected, too).
> These problems were detected only 5 days before the official Java 7 release,
> so Oracle had no time to fix those bugs, affecting also many more
> applications. In response to our questions, they proposed to include the
> fixes into service release u2 (eventually into service release u1, see
> [http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2011-July/005971.html]).
> This means you cannot use Lucene/Solr with Java 7 releases before Update 2!
> If you do, please don't open bug reports, it is not the committers' fault! At
> least disable loop optimizations using the -XX:-UseLoopPredicate JVM options
> to not risk index corruptions.
> Please note: Also Java 6 users are affected, if you use one of those JVM
> options, which are not enabled by default: -XX:+OptimizeStringConcat or
> -XX:+AggressiveOpts
> It is strongly recommended not to use any hotspot optimization switches in
> any Java version without extensive testing!
> In the case you upgrade to Java 7, remember that you have to reindex
> everything, as the unicode version shipped with Java 7 changed and
> tokenization behaves differently!
> {quote}
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