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https://issues.apache.org/jira/browse/HBASE-21933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772047#comment-16772047
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Sean Busbey commented on HBASE-21933:
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line numbers don't fit, because I don't know what version, but this looks like
the issue:
# [Krb5LoginModule asks for private credentials and iterates over it to remove
things|https://github.com/unofficial-openjdk/openjdk/blob/jdk8u/jdk8u/jdk/src/share/classes/com/sun/security/auth/module/Krb5LoginModule.java#L1206]
# [Subject just returns the backing private credential
set|https://github.com/unofficial-openjdk/openjdk/blob/jdk8u/jdk8u/jdk/src/share/classes/javax/security/auth/Subject.java#L685]
# [that private credential set is a set wrapped in
Collections.synchronizedSet|https://github.com/unofficial-openjdk/openjdk/blob/jdk8u/jdk8u/jdk/src/share/classes/javax/security/auth/Subject.java#L160]
# [Collections.synchronizedSet specifies that iterator use like the one in
Krb5LoginModule must use a synchronized block on the
collection|https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#synchronizedSet-java.util.Set-],
which the code isn't doing.
def a jdk bug in *some* jdk versions. gonna go find official source.
> regionserver (with kerberos ) relogin failture from keytab due to the
> ConcurrentModificationException
> -----------------------------------------------------------------------------------------------------
>
> Key: HBASE-21933
> URL: https://issues.apache.org/jira/browse/HBASE-21933
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 1.2.0
> Reporter: powerinf
> Priority: Blocker
> Attachments: region failture.txt
>
>
> Hbase regionserver could not relogin from keytab hbase.keytab ,more see log
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