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https://issues.apache.org/jira/browse/OAK-1456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13955198#comment-13955198
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Alex Parvulescu commented on OAK-1456:
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Just to sum up, the remaining question is mostly about whether this background
thread should be enabled by default in oak or not, and if so how frequently
should it run.
> Non-blocking reindexing
> -----------------------
>
> Key: OAK-1456
> URL: https://issues.apache.org/jira/browse/OAK-1456
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Michael Marth
> Assignee: Alex Parvulescu
> Priority: Blocker
> Labels: production, resilience
> Fix For: 0.20
>
> Attachments: OAK-1456.patch
>
>
> For huge Oak repos it will be essential to re-index some or all indexes in
> case they go out of sync in a non-blocking way (i.e. the repo is still
> operation while the re-indexing takes place).
> For an asynchronous index this should not be much of a problem. One could
> drop it and recreate (as an added benefit it might be nice if the user could
> simply add a property "reindex" to the index definition node to trigger this).
> For synchronous indexes, I suggest the mechanism creates an asynchronous
> index behind the scenes first and once it has caught up
> * blocks writes (?)
> * removes the existing synchronous index
> * moves asynchronous index in its place and makes it synchronous
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