[KUDU-2322] Leader spews logs when follower falls behind log GC

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.7.0
• Fix Version/s: 1.8.0, 1.7.1
• Component/s: consensus
• Target Version/s: 1.7.0
• Code Review: http://gerrit.cloudera.org:8080/9573
• Assignee: Alexey Serbin
• Reporter: Todd Lipcon
• Created: 22/Feb/18 06:03
• Updated: 27/Feb/20 23:32
• Resolved: 13/Mar/18 18:36

Description

I'm running a YCSB-based write stress test and found that one of the followers fell behind enough that its logs got GCed by the leader. At this point, the leader started logging about 100 messages per second indicating that it could not obtain a request for this peer.

I believe this is a regression since 1.6, since before 3-4-3 replication we would have evicted the replica as soon as it fell behind GC.