[SOLR-13141] CDCR bootstrap does not replicate index to the replicas of target cluster

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 7.5, 7.6
• Fix Version/s: 8.3, 9.0
• Component/s: CDCR

Environment

This is system independent problem - exists on windows and linux - reproduced by independent developers

• Assignee: Shalin Shekhar Mangar
• Reporter: Krzysztof Watral
• Created: 16/Jan/19 10:04
• Updated: 12/May/22 00:26
• Resolved: 09/Aug/19 03:01

Description

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

I've also discovered that problems appears only in case, when the replicationFactor parameter is higher than one

Issue Links

• relates to: SOLR-11724 Cdcr Bootstrapping does not cause "index copying" to follower nodes on Target