Critical Description
Couple of FTS customers observed the following crash while using queries like facets or custom field based sort.
And the crashes were observed pretty consistently for them.
fatal error: concurrent map iteration and map writefatal error: concurrent map iteration and map write
goroutine 37690209 [running]:runtime.throw(0xdf8901, 0x26) /home/couchbase/.cbdepscache/exploded/x86_64/go-1.9.6/go/src/runtime/panic.go:605 +0x95 fp=0xc471397d30 sp=0xc471397d10 pc=0x42d885runtime.mapiternext(0xc471397e60) /home/couchbase/.cbdepscache/exploded/x86_64/go-1.9.6/go/src/runtime/hashmap.go:778 +0x6f1 fp=0xc471397dc8 sp=0xc471397d30 pc=0x40ba91github.com/blevesearch/bleve/index/scorch.(*cachedDocs).updateSizeLOCKED(0xc4a7e2ce60) godeps/src/github.com/blevesearch/bleve/index/scorch/snapshot_segment.go:234 +0x132 fp=0xc471397ed0 sp=0xc471397dc8 pc=0x60e872github.com/blevesearch/bleve/index/scorch.(*cachedDocs).prepareFields(0xc4a7e2ce60, 0xc4c2743c60, 0x2, 0x2, 0xc4ae472e80, 0xc45d2a5540, 0x2) godeps/src/github.com/blevesearch/bleve/index/scorch/snapshot_segment.go:206 +0x395 fp=0xc471397f60 sp=0xc471397ed0 pc=0x60e585github.com/blevesearch/bleve/index/scorch.(*IndexSnapshot).documentVisitFieldTermsOnSegment.func1(0xc4ae472e80, 0xc4c2743c60, 0x2, 0x2, 0xc486117920) godeps/src/github.com/blevesearch/bleve/index/scorch/snapshot_index.go:564 +0x56 fp=0xc471397fb8 sp=0xc471397f60 pc=0x611726runtime.goexit()
This issue is already fixed in MH/ bleve master and needs to be propagated to Alice releases.
And this would be very useful for customers, else they had to wait until the MH release which has a wait period.