You are viewing a plain text version of this content. The canonical link for it is here.
Posted to oak-issues@jackrabbit.apache.org by "Julian Reschke (JIRA)" <ji...@apache.org> on 2017/12/30 09:06:05 UTC
[jira] [Closed] (OAK-6867) Enable index hints on UUID lookup query
[ https://issues.apache.org/jira/browse/OAK-6867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Julian Reschke closed OAK-6867.
-------------------------------
> Enable index hints on UUID lookup query
> ---------------------------------------
>
> Key: OAK-6867
> URL: https://issues.apache.org/jira/browse/OAK-6867
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Alex Deparvu
> Assignee: Thomas Mueller
> Fix For: 1.7.14, 1.8
>
>
> For the UUID lookup query I enabled the (recently added) query hints support where you can specify the index you want to be used and I got an interesting speedup in the benchmarks:
> {noformat}
> Hint disabled, lookup by query
> # UUIDLookupTest C min 10% 50% 90% max N
> No of indexes (60) 60, Lookup by (lookupByQuery)[query]
> Oak-Segment-Tar 1 5 5 6 7 27 9837
> Hint enabled, lookup by query
> # UUIDLookupTest C min 10% 50% 90% max N
> No of indexes (60) 60, Lookup by (lookupByQuery)[query]
> Oak-Segment-Tar 1 5 5 6 7 13 10128
> Hint enabled, lookup by getNode
> # UUIDLookupTest C min 10% 50% 90% max N
> No of indexes (60) 60, Lookup by (lookupByQuery)[Session#getNodeByIdentifier]
> Oak-Segment-Tar 1 5 6 6 7 13 9447
> Hint disabled, lookup by getNode
> # UUIDLookupTest C min 10% 50% 90% max N
> No of indexes (60) 60, Lookup by (lookupByQuery)[Session#getNodeByIdentifier]
> Oak-Segment-Tar 1 3 3 3 4 8 17504
> {noformat}
> It seems the cost shortcut is reducing the overall time, but cannot say for sure where this change comes from.
> The only change I did was to add {{option(index name uuid)}} to this query [0]
> [~tmueller], [~chetanm] what do you think?
> [0] https://github.com/apache/jackrabbit-oak/blob/trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/identifier/IdentifierManager.java#L356
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)