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https://issues.apache.org/jira/browse/KARAF-986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148140#comment-13148140
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Guillaume Nodet commented on KARAF-986:
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The reason for those questions is that those bugs have been ported into
pax-logging a long time ago and have been included in karaf since a few
releases afaik. Although ServiceMix is using a slightly older version of
Karaf, so I'd suggest upgrading your pax-logging bundles in your ServiceMix
distribution to the latest releases and double-check if you still see those
issues.
> Synchronisation issue when rootLogger is DEBUG and Karaf is started afresh
> --------------------------------------------------------------------------
>
> Key: KARAF-986
> URL: https://issues.apache.org/jira/browse/KARAF-986
> Project: Karaf
> Issue Type: Bug
> Affects Versions: 2.2.4
> Reporter: Raul Kripalani
>
> When working in development mode, you will many times set your rootLogger's
> level to DEBUG.
> If you delete the $KARAF_HOME/data dir and start afresh while your rootLogger
> remains on DEBUG, Karaf will likely block during bundle startup if you have
> large number of boot features (e.g. ServiceMix) defined in the
> {{featuresBoot}} property under {{org.apache.karaf.features.cfg}}.
> Changing the log level back to INFO avoids the issue.
> Looks like it only happens if a large number of threads is emitting log
> statements simultaneously, as seen in [1] & [2]. Thread dump looks exactly
> the same as the one submitted in [1].
> Not sure if there's much we can do on the Karaf side of things, but I guess
> it's worth raising.
> [1] https://issues.apache.org/bugzilla/show_bug.cgi?id=50213
> [2] https://issues.apache.org/bugzilla/show_bug.cgi?id=51047
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