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https://issues.apache.org/jira/browse/SLING-7544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16408350#comment-16408350
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ASF GitHub Bot commented on SLING-7544:
---------------------------------------
catholicon 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_r176186913
##########
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:
Quick note as @DominikSuess pinged me offline. I wonder if it might an
interesting idea to do a `EXPLAIN SELECT sling:alias .... ` first and see that
`/* travers` doesn't show up in the plan.
That should work across oak versions afaict (I just tested with oak 1.2.2)
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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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