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  1. Core Server
  2. SERVER-43975

in seconday appear global lock issue the find from secondary very slowly

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    Details

    • Type: Bug
    • Status: Needs Verification
    • Priority: Major - P3
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:
      None
    • Operating System:
      ALL

      Description

      hi

          we have a problem when we send query same litter data collections in secondary always appear same very slowly query problems ,every day about one or two times.in the slowly logs we could find the timeAcquiringMicros take the longest time in the query.i think if always appear this problem .maybe we can't use secondary as one of the query point for share the responsibility of primary .because this will block  the query too long time.and let our program became dead.

       

      the log like this 

      2019-10-12T07:34:50.684+0800 I COMMAND [conn1279777] command gacc.r_plugin command: find \{ find: "r_plugin", filter: { type: "h3c" }, limit: 1, shardVersion: [ Timestamp 0|0, ObjectId('000000000000000000000000') ] } planSummary: IXSCAN \{ type: 1 } keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:350 locks:\{ Global: { acquireCount: { r: 2 }, acquireWaitCount: \{ r: 1 }, timeAcquiringMicros: \{ r: 38560627 } }, Database: \{ acquireCount: { r: 1 } }, Collection: \{ acquireCount: { r: 1 } } } protocol:op_command 38560ms
      

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                • Created:
                  Updated: