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https://issues.apache.org/jira/browse/SOLR-9515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757791#comment-16757791
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Kevin Risden commented on SOLR-9515:
------------------------------------
Well looks like I found something that is promising. I don't know why this
would work on JDK8 though.
[https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html]
{code:java}
If a SecurityManager is present and no factory is specified, then the default
pool uses a factory supplying threads that have no Permissions enabled. The
system class loader is used to load these classes. Upon any error in
establishing these settings, default parameters are used. It is possible to
disable or limit the use of threads in the common pool by setting the
parallelism property to zero, and/or using a factory that may return null.
However doing so may cause unjoined tasks to never be executed.
{code}
[https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/ForkJoinPool.html]
{code:java}
If no thread factory is supplied via a system property, then the common pool
uses a factory that uses the system class loader as the thread context class
loader. In addition, if a SecurityManager is present, then the common pool uses
a factory supplying threads that have no Permissions enabled. Upon any error in
establishing these settings, default parameters are used. It is possible to
disable or limit the use of threads in the common pool by setting the
parallelism property to zero, and/or using a factory that may return null.
However doing so may cause unjoined tasks to never be executed.{code}
From
https://github.com/apache/hadoop/blob/branch-3.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java#L213
> Update to Hadoop 3
> ------------------
>
> Key: SOLR-9515
> URL: https://issues.apache.org/jira/browse/SOLR-9515
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Assignee: Kevin Risden
> Priority: Blocker
> Fix For: 8.0, master (9.0)
>
> Attachments: SOLR-9515.patch, SOLR-9515.patch, SOLR-9515.patch,
> SOLR-9515.patch, SOLR-9515.patch, SOLR-9515.patch
>
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> Hadoop 3 is not out yet, but I'd like to iron out the upgrade to be prepared.
> I'll start up a dev branch.
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