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From "Shawn Heisey (JIRA)" <>
Subject [jira] [Created] (SOLR-3954) Option to have updateHandler and DIH skip updateLog
Date Tue, 16 Oct 2012 15:59:03 GMT
Shawn Heisey created SOLR-3954:

             Summary: Option to have updateHandler and DIH skip updateLog
                 Key: SOLR-3954
             Project: Solr
          Issue Type: Improvement
          Components: update
    Affects Versions: 4.0
            Reporter: Shawn Heisey
             Fix For: 4.1

The updateLog feature makes updates take longer, likely because of the I/O time required to
write the additional information to disk.  It may take as much as three times as long for
the indexing portion of the process.  I'm not sure whether it affects the time to commit,
but I would imagine that the difference there is small or zero.  When doing incremental updates/deletes
on an existing index, the time lag is probably very small and unimportant.

When doing a full reindex (which may happen via DIH), especially if this is done in a build
core that is then swapped with a live core, this performance hit is unacceptable.  It seems
to make the import take about three times as long.

An option to have an update skip the updateLog would be very useful for these situations.
 It should have a method in SolrJ and be exposed in DIH as well.

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