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https://issues.apache.org/jira/browse/SOLR-13726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16918806#comment-16918806
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Kevin Risden commented on SOLR-13726:
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Some references about useSubjectCredsOnly:
* Source where default is true -
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/sun/security/jgss/GSSUtil.java#l259
* ugly issue where causes hung threads -
https://risdenk.github.io/2018/03/15/hdf-apache-nifi-kerberos-errors-usesubjectcredsonly.html
> Krb5HttpClientBuilder avoid setting javax.security.auth.useSubjectCredsOnly
> ---------------------------------------------------------------------------
>
> Key: SOLR-13726
> URL: https://issues.apache.org/jira/browse/SOLR-13726
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Kevin Risden
> Priority: Major
>
> Solr should avoid setting system properties that affect the entire JVM.
> Specifically "javax.security.auth.useSubjectCredsOnly" is one that can cause
> a bunch of issues if SolrJ is colocated with other Kerberos secured services.
> Krb5HttpClientBuilder changes the JVM default to false if it is not set. It
> is defaulting to true. This affects everything in the JVM. Since SolrJ is
> meant to be client side, we should avoid doing this.
> [https://github.com/apache/lucene-solr/blame/master/solr/solrj/src/java/org/apache/solr/client/solrj/impl/Krb5HttpClientBuilder.java#L144]
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