[jira] [Commented] (OAK-1456) Non-blocking reindexing

["Alex Parvulescu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-1456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13956310#comment-13956310 ] 

Alex Parvulescu commented on OAK-1456:
--------------------------------------

This is how it should be enabled if needed (the oak-core version):

{code}
  name = "async-reindex";
  task = new AsyncIndexUpdate(name, store, indexEditors, true);
  scheduleWithFixedDelay(whiteboard, task, 5, true);
{code}

> 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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