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Advisor check: MongoDB write ticket is more than 128

Description

This advisor warns if the number of write transactions (tickets) into the WiredTiger storage during runtime is more than 128. Too high number of write tickets can cause performance issues.

Ideally, the number of tickets should be based on the number of CPU available. The default number of write tickets is 128. You can adjust it for both your mongod and mongos nodes.

For more information, see wiredTigerConcurrentWriteTransactions in the MongoDB documentation.

Rule

MONGODB_GETPARAMETER

db.adminCommand( { setParameter: 1, "wiredTigerConcurrentWriteTransactions": "128" } )

Resolution

Adjust the number of write tickets allowed into the WiredTiger storage engine.

  • Using the setParameter shell helper:
mongo> db.adminCommand( { setParameter: 1, "wiredTigerConcurrentWriteTransactions": "128"  } )
  • Editing the configuration file 
setParameter:     
   wiredTigerConcurrentWriteTransactions: 128

Note that the changes in the configuration file will take effect only after the server restart.

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