Replicas out of sync – Lucidworks

Issue:

There is a known issue on related to Solr: https://issues.apache.org/jira/browse/SOLR-14431

that affects at least down to 8.1.1 and is fixed in 8.6 that makes it so replicas can get out of sync with each other.

Environment:

Solr 8.1.1 -> 8.5+

Fixed: 8.6

Resolution:

There is a workaround without having to upgrade. You can put into the solrconfig -

<requestHandler name="/admin/segments" class="solr.SegmentsInfoRequestHandler">
    <!-- work around for https://issues.apache.org/jira/browse/SOLR-14431 -->
    <lst name="invariants">
      <bool name="coreInfo">true</bool>
    </lst>
  </requestHandler>

Cause:

Further reading is here: https://issues.apache.org/jira/browse/SOLR-14431

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