dsmiley commented on a change in pull request #580:
URL: https://github.com/apache/solr/pull/580#discussion_r797962588



##########
File path: 
solr/core/src/java/org/apache/solr/core/TransientSolrCoreCacheDefault.java
##########
@@ -89,6 +86,25 @@ public TransientSolrCoreCacheDefault(CoreContainer 
coreContainer) {
     transientDescriptors = new LinkedHashMap<>(initialCapacity);
   }
 
+  private void onEvict(SolrCore core) {
+    if (coreContainer.hasPendingCoreOps(core.getName())) {
+      if (log.isInfoEnabled()) {
+        log.info("NOT evicting transient core [{}]; it's loading or something 
else", core.getName());
+      }
+      transientCores.put(core.getName(), core); // put back

Review comment:
       In a race scenario with the removalListener: getCore will call `core = 
solrCores.waitAddPendingCoreOps(name);` which will return the core that was put 
back (un-evicted).  It will see it and return it without creating a new one.  I 
don't think there will be errors.




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