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https://issues.apache.org/jira/browse/SOLR-9059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-9059.
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Resolution: Implemented
> NPE in SolrClientCache following collection reload
> --------------------------------------------------
>
> Key: SOLR-9059
> URL: https://issues.apache.org/jira/browse/SOLR-9059
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Fix For: 6.1
>
> Attachments: SOLR-9059.patch, SOLR-9059.patch
>
>
> Currently the StreamHandler opens the client cache only once when the
> StreamHandler is initialized. During a collection reload the client cache is
> closed by the closeHook, but not re-opened. This causes null pointers as the
> CloudSolrClient sets the zkStateReader = null when it's closed.
> A simple fix for this is to have the SolrClientCache clear it's internal map
> of clients after closing. The next time the cache is accessed it will then
> create new clients.
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