patch: Don't take snapshot if there are no differences
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Key: SOLR-624
URL: https://issues.apache.org/jira/browse/SOLR-624
Project: Solr
Issue Type: Improvement
Components: replication
Affects Versions: 1.3
Reporter: Richard "Trey" Hyde
Fix For: 1.3
This is similar in concept to a change I made several years ago in Solar.
Cronned snapshooters can quickly generate a lot of snaps which will then be
unnecessarily distributed to the slaves if there hasn't been any changes in
that period.
Adds a "check" argument to make sure there where changes to the index before
taking the snap.
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