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  1. Couchbase Server
  2. MB-44944

Hang in Intersect Scan

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    • Untriaged
    • 1
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    Description

      Repro:

      Install  6.6.1-9213
      Install travel-sample
      CREATE INDEX `def_type` ON `travel-sample`(`type`);  -- Already there
      CREATE INDEX `ix10` ON `travel-sample`(`country`);
      CREATE INDEX `ix11` ON `travel-sample`(`id`);
       
      \set -timeout "1ms";
      select type, country, x FROM `travel-sample` where type = "airline" AND country = "United States" and id = "abc";
       
      repeat select statement many/many times at some point you will see hang.
      Check go routine dump and you similar like below.
      

      goroutine 7624472 [semacquire, 3633 minutes]:
      sync.runtime_Semacquire(0xc00cf609ac)
              /home/couchbase/.cbdepscache/exploded/x86_64/go-1.11.4/go/src/runtime/sema.go:56 +0x39
      sync.(*WaitGroup).Wait(0xc00cf609ac)
              /home/couchbase/.cbdepscache/exploded/x86_64/go-1.11.4/go/src/sync/waitgroup.go:130 +0x64
      github.com/couchbase/query/execution.(*valueExchange).retrieveChildNoStop(0xc00cf60900, 0xc00cf606c0)
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/exchange.go:428 +0x85
      github.com/couchbase/query/execution.(*base).childrenWaitNoStop(0xc00cf60900, 0xc004a69e00, 0x2, 0x10)
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/base.go:741 +0x1c7
      github.com/couchbase/query/execution.(*IntersectScan).RunOnce.func1()
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_intersect.go:146 +0x7f6
      github.com/couchbase/query/util.(*Once).Do(0xc00cf60a08, 0xc0047a6f88)
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/util/sync.go:54 +0x4a
      github.com/couchbase/query/execution.(*IntersectScan).RunOnce(0xc00cf60900, 0xc006625b00, 0x0, 0x0)
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_intersect.go:61 +0x82
      created by github.com/couchbase/query/execution.(*base).runConsumer.func1
              /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/base.go:805 +0x2d6
       
      
      

      Attachments

        1. f.log
          13.76 MB
          Sitaram Vemulapalli
        2. g.log
          12.94 MB
          Sitaram Vemulapalli

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            pierre.regazzoni Pierre Regazzoni
            Sitaram.Vemulapalli Sitaram Vemulapalli
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            Dates

              Created:
              Updated:
              Resolved:

              PagerDuty