Few nodes stay in warmup state in high bucket density test

Build 6.5.0-4841

Observed that when we created 32 buckets in high bucket density test, KV nodes stay in warmup state.

Job- http://perf.jenkins.couchbase.com/job/arke-multi-bucket/336/
Logs-
KV nodes-
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.12.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.13.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.14.zip

Other nodes-
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.96.20.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.96.23.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.177.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.19.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/warmup_hbd2/collectinfo-2019-11-19T144938-ns_1%40172.23.97.20.zip

Last good build- 6.5.0-4744