XDCR - race condition in DCP (2)

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WARNING: DATA RACE

Read at 0x00c000b91218 by goroutine 236:

  github.com/couchbase/gomemcached/client.(*UprFeed).GetUprEventCh()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/gomemcached/client/upr_feed.go:733 +0x3e

  github.com/couchbase/goxdcr/parts.(*DcpNozzle).getDcpDataChanLen()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:1902 +0x2a5

  github.com/couchbase/goxdcr/parts.(*DcpNozzle).collectDcpDataChanLen()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:1891 +0x2d6

Previous write at 0x00c000b91218 by goroutine 153:

  github.com/couchbase/gomemcached/client.(*UprFeed).StartFeedWithConfig()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/gomemcached/client/upr_feed.go:772 +0x6b

  github.com/couchbase/goxdcr/parts.(*DcpNozzle).Start()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:769 +0x989

  github.com/couchbase/goxdcr/pipeline.(*GenericPipeline).startPart()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/pipeline/generic_pipeline.go:229 +0x301

  github.com/couchbase/goxdcr/pipeline.(*GenericPipeline).startPartsWithTimeout.func1.1()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/pipeline/generic_pipeline.go:149 +0x13a

Goroutine 236 (running) created at:

  github.com/couchbase/goxdcr/parts.(*DcpNozzle).Start()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:765 +0x56b

  github.com/couchbase/goxdcr/pipeline.(*GenericPipeline).startPart()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/pipeline/generic_pipeline.go:229 +0x301

  github.com/couchbase/goxdcr/pipeline.(*GenericPipeline).startPartsWithTimeout.func1.1()

      /Users/neil.huang/source/couchbase/goproj/src/github.com/couchbase/goxdcr/pipeline/generic_pipeline.go:149 +0x13a

==================