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  1. Core Server
  2. SERVER-18841

Make awaitData cursors block rather than busy wait in the OP_GET_MORE path

          Details

          • Type: Improvement
          • Status: Closed
          • Priority: Major - P3
          • Resolution: Fixed
          • Affects Version/s: None
          • Fix Version/s: 3.1.6
          • Component/s: Querying
          • Labels:
            None
          • Backwards Compatibility:
            Fully Compatible
          • Sprint:
            Quint Iteration 5, Quint Iteration 6

            Description

            In the getMore command path, threads servicing awaitData cursors will always block rather than busy wait. For OP_GET_MORE, however, the thread will block if it is tailing the oplog but for any other capped collection it will busy wait.

            We can use the per-capped collection condition variable added under SERVER-18184 to remove busy waiting from the OP_GET_MORE path.

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                Issue Links

                depends on

                Improvement - An improvement or enhancement to an existing feature or task. SERVER-19099 Switch stdx::polyfills for concurrency and time to use std components

                • Major - P3 - Major loss of function.
                • Closed
                is related to

                Epic - gh.issue.epic.desc SERVER-15176 New commands for find and getMore

                • Major - P3 - Major loss of function.
                • Closed

                Task - A task that needs to be done. SERVER-18184 Add awaitData support to getMore command

                • Major - P3 - Major loss of function.
                • Closed
                related to

                Bug - A problem which impairs or prevents the functions of the product. SERVER-19947 Deadlock between aggregations with sorts on sharded collections and operations requiring MODE_X database locks

                • Major - P3 - Major loss of function.
                • Closed

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                      Dates

                      • Created:
                        Updated:
                        Resolved: