UI sometimes show duplicate entries for index compaction

UI sometimes show duplicate entries for index compaction. Please see attached screenshot.
The UI shows duplicate entries for index compaction for 'default/_design/d1' and 'default/_design/d2'

Curling the _active_tasks shows there is no duplicate index compaction process running.

Below are the steps followed:

• Create a cluster of 2 nodes
• Create 2 buckets (default, saslbucket)
• Load 500K docs in each bucket
  ./lib/perf_engines/mcsoda.py membase://10.3.2.57:8091 vbuckets=128 doc-gen=0 doc-cache=0 ratio-creates=1 ratio-sets=1 ratio-misses=0 min-value-size=256,512 max-items=500000 exit-after-creates=1 prefix=70one
  ./lib/perf_engines/mcsoda.py saslbucket:saslpass@10.3.2.57 vbuckets=128 doc-gen=0 doc-cache=0 ratio-creates=1 ratio-sets=1 ratio-misses=0 min-value-size=256,512 max-items=500000 exit-after-creates=1 prefix=70one

• Create ddocs/views

curl -v -X PUT -H 'Content-Type: application/json' 'http://saslbucket:saslpass@10.3.2.57:8092/saslbucket/_design/d1' \
-d '{"views": { "v1":{"map":"function(doc)

{\nemit(doc.key,doc.key_num);\n}"}, "v2":{"map":"function(doc,meta){\nemit(meta.id,doc.key);\n}"} }}'
curl -v -X PUT -H 'Content-Type: application/json' 'http://saslbucket:saslpass@10.3.2.57:8092/saslbucket/_design/d2' \
-d '{"views": { "v1":{"map":"function(doc){\nemit(doc.key,doc.name);\n}"}, "v2":{"map":"function(doc,meta){\nemit(meta.id,[doc.key_num,doc.key_num]);\n}"} }}'

curl -v -X PUT -H 'Content-Type: application/json' 'http://10.3.2.57:8092/default/_design/d1' \
-d '{"views": { "v1":{"map":"function(doc){nemit(doc.key,doc.key_num);n}

"}, "v2":{"map":"function(doc,meta)

{\nemit(meta.id,doc.key);\n}

"} }}'
curl -v -X PUT -H 'Content-Type: application/json' 'http://10.3.2.57:8092/default/_design/d2' \
-d '{"views": { "v1":{"map":"function(doc)

{\nemit(doc.key,doc.name);\n}

"}, "v2":{"map":"function(doc,meta)

{\nemit(meta.id,[doc.key_num,doc.key_num]);\n}

"} }}'

• Allow initial indexing to finish and then remove and rebalance out 1 node.
• While rebalance is in progress, run manual compaction for all design docs/views. In the UI, duplicate entries for the index compaction can be observed.

Diagnostics are attached.