[SOLR-12805] Store previous term (generation) of replica when start recovery process

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.0
• Assignee: Cao Manh Dat
• Reporter: Cao Manh Dat
• Created: 26/Sep/18 03:13
• Updated: 08/Jun/19 14:58
• Resolved: 26/Sep/18 03:36

Description

Right now the current implementation of ZkShardTerms.startRecovering(core2) is

from {"core1" : 4, "core2" : 2} to {"core1" : 4, "core2" : 4, "core2_recovering" : 4}. If we change the behavior a little bit to {"core1" : 4, "core2" : 4, "core_recovering" : 2}. We will have more information about the current generation of core2's index which is a very useful information for leader election.