[jira] [Closed] (OAK-6394) Reduce impact of default multiplexing setup on the ReferenceIndex

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-6394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-6394.
---------------------------------

Bulk close for 1.7.3

> Reduce impact of default multiplexing setup on the 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
>            Assignee: Alex Deparvu
>             Fix For: 1.7.3
>
>
> 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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