dsmiley commented on a change in pull request #580:
URL: https://github.com/apache/solr/pull/580#discussion_r797970632
##########
File path: solr/core/src/java/org/apache/solr/core/CoreContainer.java
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@@ -2284,8 +2285,10 @@ public void run() {
SolrCore core;
while (!container.isShutDown() && (core = solrCores.getCoreToClose()) !=
null) {
+ assert core.getOpenCount() == 1;
Review comment:
The closer thread only operates on cores that have already been removed
from access (e.g. to be opened for a new query). And a request to open it
(transiently?) will block because this queue is considered in
`SolrCores.pendingCoreOps`
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