[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-626) Allow MassIndexer to work alongside regular indexing / querying

[Sanne Grinovero (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43095#comment-43095 ] 

Sanne Grinovero commented on HSEARCH-626:
-----------------------------------------

Make sure to review disabled test org.hibernate.search.test.batchindexing.BatchBackendConfigurationTest.testConfigurationIsRead(), if it will still apply.

> Allow MassIndexer to work alongside regular indexing / querying
> ---------------------------------------------------------------
>
>                 Key: HSEARCH-626
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-626
>             Project: Hibernate Search
>          Issue Type: New Feature
>          Components: massindexer
>            Reporter: Emmanuel Bernard
>            Assignee: Sanne Grinovero
>             Fix For: 4.0.0.Alpha1
>
>
> Some people want to use mass indexer to reindex live some data.
> This is problematic today as MassIndexer expects to work alone / offline.
> I can see at least one approach:
>  - copy the index to a new Directory before mass indexing (or if exclusive, start with a new Directory while keeping the old Directory in place
>  - the current directory needs to become read-only
>  - all index update (on the entity) requests should be queued up for after massIndexer is done
>  - MassIndexer swaps the current and the new directory 
>  - indexing and querying resume as normal
> Note that we need to work on a different directory because mass indexer does delete all entries of an entity before starting the reindexing process.

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