Solr 8.1 replication with invalid master error after setting up

Question

I followed the article (https://medium.com/@hanyshehata/sitecore-setup-using-solr-master-slave-index-replication-6417cdd98eaa) to set up solr (8.1.1) master/slave on scaled environment. While I got the following error on slave server. Not exactly sure what is wrong with that. Much appreciated if anyone can help with that.

Answer 1

You must have missed something in your configuration in solr.config file either on master or on slave server.

Here is a sample configuration for <requestHandler section for master server:

<requestHandler name="/replication" class="solr.ReplicationHandler">
  <lst name="master">
    <str name="replicateAfter">commit</str>
    <str name="backupAfter">optimize</str>
    <str name="confFiles">schema.xml,stopwords.txt,elevate.xml</str>
    <str name="commitReserveDuration">00:00:10</str>
  </lst>
  <int name="maxNumberOfBackups">2</int>
  <lst name="invariants">
    <str name="maxWriteMBPerSec">16</str>
  </lst>
</requestHandler>

and here is sample configuration for slave server:

<requestHandler name="/replication" class="solr.ReplicationHandler">
  <lst name="slave">
  
    <!-- fully qualified url for the replication handler of master. It is
         possible to pass on this as a request param for the fetchindex command -->
    <str name="masterUrl">https://master.solr:8983/solr/sitecore_core_index</str>
  
    <!-- Interval in which the slave should poll master.  Format is HH:mm:ss .
         If this is absent slave does not poll automatically.
  
         But a fetchindex can be triggered from the admin or the http API -->
  
    <str name="pollInterval">00:00:20</str>
  </lst>
</requestHandler>