[hibernate-issues] [Hibernate-JIRA] Created: (HSEARCH-626) Allow MassIndexer to work in parallel of regular indexing / querying

[Emmanuel Bernard (JIRA)]

Allow MassIndexer to work in parallel of regular indexing / querying
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                 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


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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