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https://issues.apache.org/jira/browse/OAK-1912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043113#comment-14043113
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Thomas Mueller commented on OAK-1912:
-------------------------------------
As a workaround: before the upgrade, the limit for long running queries could
be set (manually over JMX). This will make those queries fail. At least they
would not traverse the whole repository. The limit could then be reset after
the upgrade.
> The UUID index temporarily not available during Oak upgrade
> -----------------------------------------------------------
>
> Key: OAK-1912
> URL: https://issues.apache.org/jira/browse/OAK-1912
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: query
> Affects Versions: 1.0, 1.0.1
> Reporter: Thomas Mueller
>
> In an OSGi framework, when upgrading the Oak version, the UUID index is
> temporarily not available, but queries with the condition "uuid=<x>" are
> still run, and therefore traverse the whole repository.
> This makes upgrading the Oak version very slow.
> I guess the problem is that the old index is stopped before the rest of
> oak-core is stopped, or the new index is started after the rest of oak-core
> is started.
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