[System Test][XDCR] Toptasks has no source collection namespaces - error observed in longevity

7.1.0-1377

Test:
-test tests/integration/neo/test_neo_kv_gsi_coll_xdcr_backup_sgw_fts_itemct_txns_eventing_cbas_scale3_magma.yml -scope tests/integration/neo/scope_neo_with_backup_magma.yml
Scale 3
Iteration 1

.99.25:

2021-09-29T13:57:56.070-07:00 INFO GOXDCR.PipelineMgr: Replication status is updated now, current status=name=

{8e4dc755a84c1b076a3bc60e00223311/bucket8/bucket8}

, status=

{Replicating}

, errors={[

{"time":"2021-09-29T13:57:46.02811761-07:00","errMsg":"dcp_backfill_8e4dc755a84c1b076a3bc60e00223311/bucket8/bucket8_172.23.99.25:11210_0 : Toptasks has no source collection namespaces"}

]}, oldProgress=

{All incoming nozzles have been opened}, progress={Pipeline is running}, oldBackfillProgress={All incoming nozzles have been opened}

, backfillProgress=

{Pipeline failed to start, err=map[genericPipeline.SetState.Pipeline_running:Pipeline 8e4dc755a84c1b076a3bc60e00223311/bucket8/bucket8 failed to start]}

This error occurs repetitively in xdcr logs and also shows up in the UI (screenshots attached)

Logs:
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.137.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.155.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.157.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.5.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.67.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.69.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.104.70.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.106.100.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.106.188.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.108.103.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.120.245.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.121.117.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.121.3.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.123.27.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.123.28.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.96.251.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.96.252.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.96.253.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.97.119.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.97.121.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.97.122.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.97.242.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.98.135.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.99.11.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.99.20.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.99.21.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1632953128/collectinfo-2021-09-29T220531-ns_1%40172.23.99.25.zip