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https://issues.apache.org/jira/browse/SOLR-13141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16743816#comment-16743816
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Krzysztof Watral commented on SOLR-13141:
-----------------------------------------
problem can be related with SOLR-12998 (same errors in logs), but in this case,
this is not a race condition
> replicationFactor param cause problems with CDCR
> ------------------------------------------------
>
> Key: SOLR-13141
> URL: https://issues.apache.org/jira/browse/SOLR-13141
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: CDCR
> Affects Versions: 7.5, 7.6
> Environment: This is system independent problem - exists on windows
> and linux - reproduced by independent developers
> Reporter: Krzysztof Watral
> Priority: Major
> Attachments: type 1 - replication wasnt working at all.txt, type 2 -
> only few documents were being replicated.txt
>
>
> i have encountered some problems with CDCR that are related to the value of
> {{replicationFactor}} param.
> I ran the solr cloud on two datacenters with 2 nodes on each:
> * dca:
> ** dca_node_1
> ** dca_node_2
> * dcb
> ** dcb_node_1
> ** dcb_node_2
> Then in sequence:
> * I configured the CDCR on copy of *_default* config set named
> *_default_cdcr*
> * I created collection on both DC from *_default_cdcr* config set with the
> following parameters:
> ** {{numShards}} = 2
> ** {{maxShardsPerNode}} = 2
> ** {{replicationFactor}} = 2
> * I disabled buffer on collection on both DC
> * I ran CDCR on both DC
> CDCR has started without errors in logs. Then:
> * I stopped CDCR on both DC
> * I stopped all solr nodes
> * I restarted zookeepers on both DC
> * I started all solr nodes one by one
> * few minutes later I stared CDCR on both DC
> * CDCR has starded with 2 types of errors presented bellow (replication
> between DC is not working)
> ** 1st type - replication between DC wasn't working at all
> ** 2nd type - only few documents from 1000 has been replicated, restart
> didn't help (documents has not been synchronized)
> {panel}
> I've also discovered that problem appears only in case, when the
> {{replicationFactor}} parameter is higher than one
> {panel}
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