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  1. Core Server
  2. SERVER-36295

Transaction metrics not updated on TransientTransactionError

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.1.3
    • Diagnostics
    • None
    • Fully Compatible
    • ALL
    • Repl 2018-08-13, Repl 2018-08-27
    • 18

    Description

      Same test as SERVER-36294 - 10 threads doing simple udpates to single independent documents.

      At A 6 of the 10 threads got a TransientTransactionError, apparently (based on timing in chart above) because the in-progress transaction reaper job prevented them from acquiring a lock within 5ms:

      Error: command failed: {
      	"errorLabels" : [
      		"TransientTransactionError"
      	],
      	"operationTime" : Timestamp(1532607909, 727),
      	"ok" : 0,
      	"errmsg" : "Unable to acquire lock '{6237343057549539649: Database, 1625657039122151745}' within a max lock request timeout of '5ms' milliseconds.",
      	"code" : 24,
      	"codeName" : "LockTimeout",
      	"$clusterTime" : {
      		"clusterTime" : Timestamp(1532607909, 727),
      		"signature" : {
      			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
      			"keyId" : NumberLong(0)
      		}
      	}
      }
      

      The 10 threads continue, but the open and active counters are now stuck ranging from 6-16 instead of 0-10. Apparently the counters have not been decremented on the error.

      At B I killed the mongo shell. It appears there was still one transaction open at that point because open is 7 and inactive is 1. At C after that transaction times out we remain stuck indefinitely with open at 6 and active at 6.

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              william.schultz@mongodb.com William Schultz (Inactive)
              bruce.lucas@mongodb.com Bruce Lucas
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                Created:
                Updated:
                Resolved: