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https://issues.apache.org/jira/browse/SOLR-7423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14502105#comment-14502105
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Uwe Schindler commented on SOLR-7423:
-------------------------------------
If you just need one that uses Identity (not equals), you can use
WeakIdentityMap from Lucene. This one can be backed by a ConcurrentHashMap for
thread safety. MMapDirectory uses it.
> Non thread safe use of WeakHashMap can hang in get method.
> ----------------------------------------------------------
>
> Key: SOLR-7423
> URL: https://issues.apache.org/jira/browse/SOLR-7423
> Project: Solr
> Issue Type: Bug
> Reporter: Mark Miller
>
> You can see this with some googling and I just saw it happen in
> TestSolrConfigHandler. A thread was stuck in HttpCacheHeaderUtil in the get
> for the WeakHashMap.
> Apache commons-beanutils has a WeakFastHashMap that is supposed to be thread
> safe and read efficient I think.
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