AlexanderAshitkin commented on code in PR #394:
URL: 
https://github.com/apache/maven-build-cache-extension/pull/394#discussion_r2423018495


##########
src/main/java/org/apache/maven/buildcache/CacheControllerImpl.java:
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@@ -498,25 +498,23 @@ public void save(
         final MavenProject project = context.getProject();
         final MavenSession session = context.getSession();
         try {
+            attachedResourcesPathsById.clear();

Review Comment:
   it is a shared field and, potentially, could be accesses by different 
threads in a multithreaded session. It looks like a racy piece and HashMap 
might be not the best choice here. overall, elaborate please - why need this? 



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