DominikSuess commented on a change in pull request #5: SLING-7544 - improving 
optimized alias lookup to not block during int…
URL: 
https://github.com/apache/sling-org-apache-sling-resourceresolver/pull/5#discussion_r176113696
 
 

 ##########
 File path: 
src/main/java/org/apache/sling/resourceresolver/impl/mapping/MapEntries.java
 ##########
 @@ -1027,12 +1044,28 @@ private boolean addEntry(final Map<String, 
List<MapEntry>> entryMap, final Strin
      */
     private Map<String, Map<String, String>> loadAliases(final 
ResourceResolver resolver) {
         final Map<String, Map<String, String>> map = new ConcurrentHashMap<>();
-        final String queryString = "SELECT sling:alias FROM nt:base WHERE 
sling:alias IS NOT NULL";
-        final Iterator<Resource> i = resolver.findResources(queryString, 
"sql");
-        while (i.hasNext()) {
-            final Resource resource = i.next();
-            loadAlias(resource, map);
-        }
+        String queryString = "SELECT sling:alias FROM nt:base WHERE 
sling:alias IS NOT NULL";
+               if (this.factory.isForceNoAliasTraversal()) {
+                       queryString += " option(traversal fail)";
+               }
+               while (true){
+               try {
+                       final Iterator<Resource> i = 
resolver.findResources(queryString, "sql");
+                       while (i.hasNext()) {
+                           final Resource resource = i.next();
+                           loadAlias(resource, map);
+                       }
+                       break;
+               } catch (Exception e) {
+                       log.debug("Expected index not available and no 
traversal enforced", e);
+                   try {
+                       TimeUnit.MILLISECONDS.sleep(getTraversalTimer());
+                   } catch (InterruptedException ex) {
+                       log.warn("Interrupted while sleeping");
 
 Review comment:
   @rombert  yes throwing the runtimeexception doesn't make much sense and 
adding the exception was an oversight by me... will fix

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