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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SLING-7544) Make optimized alias lookup non-blocking
Date Wed, 21 Mar 2018 14:23:00 GMT

    [ https://issues.apache.org/jira/browse/SLING-7544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16407982#comment-16407982
] 

ASF GitHub Bot commented on SLING-7544:
---------------------------------------

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_r176098627
 
 

 ##########
 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)";
 
 Review comment:
   Yes this option was added in https://issues.apache.org/jira/browse/OAK-4888 - this is the
reason why I made this configurable. Afair (to be confirmed) the query will fail with corresponding
exception if the queryengine doesn't understand the option.

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> Make optimized alias lookup non-blocking
> ----------------------------------------
>
>                 Key: SLING-7544
>                 URL: https://issues.apache.org/jira/browse/SLING-7544
>             Project: Sling
>          Issue Type: Improvement
>          Components: ResourceResolver
>    Affects Versions: Resource Resolver 1.5.36
>            Reporter: Dominik Süß
>            Priority: Major
>
> The implementation of optimized alias lookup as introduced with SLING-2521 blocks CommonResourceResolver activation
while loading aliases to fillup the aliasmap. In case a corresponding index is not present
yet this can lead to full tree traversal while indexing is doing the same in the background.
> The proposed improvements are:
> * making loading of the aliasmap happen asynchronously
> * only use optimized handling as soon as aliasmap is built
> * wait for non traversal index (optional - forced by default, can be turned off for small
datasets)



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