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https://issues.apache.org/jira/browse/SOLR-7748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14612332#comment-14612332
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Shai Erera commented on SOLR-7748:
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Thanks Shawn. I actually started to work with th j9 team over the past few
weeks, on different aspects such as establishing a process for us to report
bugs and have them rub Lucene/Solr tests on j9 builds in order to detect JVM
issues. The team is also in contact with Uwe and Robert, and it seems like
things get in the right direction.
The issues that are known to cause corruption are suspected to have been fixed,
but since they were not reproducible with the latest j9 builds, we can't say it
for sure. Therfore the warnings are still found in the JavaBugs page, but I
assume that after we have Jenkins passing builds for a while, we will at least
document that these issues were not reproduced with version X and onwards.
As for this particular issue I think that we should have bin/solr successfully
start on j9. The problem that I've fixed is just passing the right gc log flag,
which is different in j9.
With this patch, we have a way to also detect particular build versions and
block them if we know they are bad. I don't think the blocking j9 entirely is a
good solution though, and definitely the script currently doesn't explicitly
block j9, it just fails with a wrong flag passed error.
>From a community perspective, I feel that blocking a JVM vendor entirely is
>wrong, but maybe I'm biased. At least I can confirm that the team gives a high
>priority to resolving any outstanding Lucene/Solr issues, so blocking j9 in
>our scripts (and code) feels wrong.
> Fix bin/solr to work on IBM J9
> ------------------------------
>
> Key: SOLR-7748
> URL: https://issues.apache.org/jira/browse/SOLR-7748
> Project: Solr
> Issue Type: Bug
> Components: Server
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 5.3, Trunk
>
> Attachments: solr-7748.patch
>
>
> bin/solr doesn't work on IBM J9 because it sets -Xloggc flag, while J9
> supports -Xverbosegclog. This prevents using bin/solr to start it on J9.
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