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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-7795) Log a debug message when two or more indices have same or very close cost amounts
Date Wed, 10 Oct 2018 09:36:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-7795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644723#comment-16644723
] 

Tommaso Teofili commented on OAK-7795:
--------------------------------------

thanks all for the review, I've adapted the patch to the above comments and committed in r1843416.

> Log a debug message when two or more indices have same or very close cost amounts
> ---------------------------------------------------------------------------------
>
>                 Key: OAK-7795
>                 URL: https://issues.apache.org/jira/browse/OAK-7795
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: query
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>            Priority: Major
>             Fix For: 1.9.10
>
>         Attachments: OAK-7795.0.patch, OAK-7795.1.patch
>
>
> The index selection mechanism in {{QueryImpl}} may lead to the wrong index to be picked
up in case different indexes return same (or very close) costs.
> As a remedy we can set cost overrides, change queries or index definitions.
> However to speed up identification of such problematics situations it'd be good to have
a line in the (debug) logs reporting when for a particular query a number of indexes have
same or very close costs (in the order of 10^-1). This would give a first pointer to such
possible problematic situations to be inspected.



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