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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-8294) Make it possible to mark a (customer) query as bad and skip it
Date Fri, 17 May 2019 08:48:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-8294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842007#comment-16842007
] 

Thomas Mueller commented on OAK-8294:
-------------------------------------

> I think the match would happen against converted sql2 statement afaict

The conversion from xpath to sql-2 happens later, so this should be fine.

I added support for patterns as an array, as you suggested, but currently only when setting
the pattern in the repository (not in JMX).

> Make it possible to mark a (customer) query as bad and skip it
> --------------------------------------------------------------
>
>                 Key: OAK-8294
>                 URL: https://issues.apache.org/jira/browse/OAK-8294
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: query
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>            Priority: Major
>         Attachments: OAK-8294.patch
>
>
> Application code can run all kinds of bad queries (reading a lot of data, slow, high
memory usage).
> The best solution is to fix the application of course. But that can take a while, and
until this is done, it would be good if bad queries can be blocked in another way. Problematic
queries would either just log a warning, or be blocked (throw an exception when trying to
run).
> Blocking should be possible via JMX, but also via persistent configuration (in the repository),
so that a restart remembers which queries are blocked.
> I don't think it's needed to stop already running queries, as the traversal limit should
solve this (it can be re-configured at runtime if needed). Also, reading the patterns from
the repository is only needed at startup (while running, JMX can be used to temporarily add
patterns).



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