[GitHub] [sling-org-apache-sling-resourceresolver] joerghoh commented on a diff in pull request #74: SLING-11394: improve diagnostics when # of vanity paths is close or greater than configured cache size

[GitBox <gi...@apache.org>]

joerghoh commented on code in PR #74:
URL: https://github.com/apache/sling-org-apache-sling-resourceresolver/pull/74#discussion_r905963985


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src/main/java/org/apache/sling/resourceresolver/impl/mapping/MapEntries.java:
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@@ -1251,20 +1251,29 @@ private Map<String, List<String>> loadVanityPaths(ResourceResolver resolver) {
         log.debug("end vanityPath query; elapsed {}ms", TimeUnit.NANOSECONDS.toMillis(queryElapsed));
 
         long count = 0;
+        long countInScope = 0;
         long processStart = System.nanoTime();
 
         while (i.hasNext()) {
             count += 1;
             final Resource resource = i.next();
             final String resourcePath = resource.getPath();
             if (Stream.of(this.factory.getObservationPaths()).anyMatch(path -> path.matches(resourcePath))) {
+                countInScope += 1;
                 final boolean addToCache = isAllVanityPathEntriesCached()
                         || vanityCounter.longValue() < this.factory.getMaxCachedVanityPathEntries();
                 loadVanityPath(resource, resolveMapsMap, targetPaths, addToCache);
             }
         }
         long processElapsed = System.nanoTime() - processStart;
-        log.debug("processed {} vanityPaths in {}ms", count, TimeUnit.NANOSECONDS.toMillis(processElapsed));
+        log.debug("processed {} vanityPaths (of which {} in scope) in {}ms", count, countInScope, TimeUnit.NANOSECONDS.toMillis(processElapsed));
+        if (!isAllVanityPathEntriesCached()) {
+            if (countInScope > this.factory.getMaxCachedVanityPathEntries()) {
+                log.warn("Number of vanity paths in scope ({}) exceeds configured cache size ({})", countInScope, this.factory.getMaxCachedVanityPathEntries());

Review Comment:
   What is the consequence of this? 
   Also can we add a call-to-action to this? Would "Increase the cache size" be the right recommendation?



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