[jira] [Created] (SOLR-9437) Add schema property useDocValues to control use of docValues at query time

["Ronald S. Wood (JIRA)" <ji...@apache.org>]

Ronald S. Wood created SOLR-9437:
------------------------------------

             Summary: Add schema property useDocValues to control use of docValues at query time
                 Key: SOLR-9437
                 URL: https://issues.apache.org/jira/browse/SOLR-9437
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 5.5.2
            Reporter: Ronald S. Wood


Currently migration to docValues appears to be an all or nothing proposition, requiring a full reindexing when an existing field with indexed records gets docValues set to true. This can be a painful process for users with very large indexes.

If a new schema property called useDocValues is created (with a default of true), this can be used to allow incremental re-indexing of records.

The idea is that while docValues=true indexing docValues will happen as before, but as long as useDocValues=false, the partially indexed docValues will not be used so that searches, faceting, etc. will behave as if docValues=false.

Once the user is satisfied that all records have docValues, they can set useDocValues=true or remove the property altogether.

From what I can see in the Solr core code, where field.hasDocValues is now used to determine whether to use docValues at query time, the code can be changed to (field.hasDocValues && field.useDocValues).

I am uncertain whether any changes would be needed at the Lucene level.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org