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Posted to oak-issues@jackrabbit.apache.org by "Tommaso Teofili (JIRA)" <ji...@apache.org> on 2018/10/02 10:16:00 UTC

[jira] [Created] (OAK-7795) Log a debug message when two or more indices have same or very close cost amounts

Tommaso Teofili created OAK-7795:
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             Summary: 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
             Fix For: 1.10


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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