[jira] [Created] (OAK-6394) Reduce default Multiplexer impact on ReferenceIndex

["Alex Deparvu (JIRA)" <ji...@apache.org>]

Alex Deparvu created OAK-6394:
---------------------------------

             Summary: Reduce default Multiplexer impact on ReferenceIndex
                 Key: OAK-6394
                 URL: https://issues.apache.org/jira/browse/OAK-6394
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core, property-index
            Reporter: Alex Deparvu


The default Multiplexing setup (no default mounts) has some impact on computing the default strategy used on the query side, as seen in some perf tests:

{noformat}
"Reverse Call Tree","Time (ms)","Level"
"java.lang.Object.hashCode() Object.java (native)","160914","1"
"java.util.HashMap.hash(Object) HashMap.java:362","","2"
"java.util.HashMap.put(Object, Object) HashMap.java:492","","3"
"java.util.HashSet.add(Object) HashSet.java:217","","4"
"java.util.Collections.addAll(Collection, Object[]) Collections.java:3845","","5"
"com.google.common.collect.Sets.newHashSet(Object[]) Sets.java:183","","6"
"org.apache.jackrabbit.oak.plugins.index.property.Multiplexers.getStrategies(boolean, MountInfoProvider, Iterable, String) Multiplexers.java:101","","7"
"org.apache.jackrabbit.oak.plugins.index.property.Multiplexers.getStrategies(boolean, MountInfoProvider, NodeState, String) Multiplexers.java:69","","8"
"org.apache.jackrabbit.oak.plugins.index.reference.ReferenceIndex.getStrategies(NodeState, MountInfoProvider, String) ReferenceIndex.java:160","","9"
"org.apache.jackrabbit.oak.plugins.index.reference.ReferenceIndex.lookup(NodeState, String, String, String, Filter) ReferenceIndex.java:135","","10"
"org.apache.jackrabbit.oak.plugins.index.reference.ReferenceIndex.query(Filter, NodeState) ReferenceIndex.java:121","","11"
"org.apache.jackrabbit.oak.query.ast.SelectorImpl.execute(NodeState) SelectorImpl.java:323","","12"
{noformat}

the reasoning being the current code builds a HashSet of one item. This can be greatly optimized by using {{ImmutableSet.of(element)}}.



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