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Posted to dev@lucene.apache.org by "Shalin Shekhar Mangar (JIRA)" <ji...@apache.org> on 2019/08/08 11:01:00 UTC
[jira] [Commented] (SOLR-13141) replicationFactor param cause
problems with CDCR
[ https://issues.apache.org/jira/browse/SOLR-13141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902877#comment-16902877 ]
Shalin Shekhar Mangar commented on SOLR-13141:
----------------------------------------------
Attached patch (originally at SOLR-11724).
A less brittle way than what was proposed for SOLR-11724 would be to update the term for the leader once bootstrap finishes. This way the replicas will automatically go to recovery. This latest patch implements this idea.
> replicationFactor param cause problems with CDCR
> ------------------------------------------------
>
> Key: SOLR-13141
> URL: https://issues.apache.org/jira/browse/SOLR-13141
> Project: Solr
> Issue Type: Bug
> 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: Critical
> Attachments: SOLR-13141.patch, 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 "customer" on both DC from *_default_cdcr* config set with the following parameters:
> ** {{numShards}} = 2
> ** {{maxShardsPerNode}} = 2
> ** {{replicationFactor}} = 2
> * I disabled cdcr buffer on collections
> * I ran CDCR on both DC
> CDCR has started without errors in logs. During indexation I have encountered problem [^type 2 - only few documents were being replicated.txt], restart didn't help (documents has not been synchronized between DC )
> 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 errors (replication between DC is not working) - [^type 1 - replication wasnt working at all.txt]
> {panel}
> I've also discovered that problems appears only in case, when the {{replicationFactor}} parameter is higher than one
> {panel}
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