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  1. Core Server
  2. SERVER-55298

Reproduce and Investigate BSONObjectTooLarge error

    • Fully Compatible
    • v5.0, v4.4
    • Sharding 2021-03-22, Sharding 2021-04-05

      In version 4.4+, a cluster can get a BSONObjectTooLarge error when attempting to migrate chunks. The _migrateClone command that the recipient invokes has logic here and here to ensure that we don't return too big of a vector to be placed in the command. The particular error is below:

      {"t": {"$date":"2021-03-10T21:27:33.038Z"} ,"s":"W","c":"SHARDING","id":23777,"ctx":"MoveChunk","msg":"Error while doing moveChunk","attr":{"error":"OperationFailed: Data transfer error: migrate failed: BSONObjectTooLarge: _migrateClone failed: :: caused by :: BSONObj size: 16861227 (0x101482B) is invalid. Size must be between 0 and 16793600(16MB) First element: ...REDACTED] }"}}

      The goal of this ticket is to reproduce the error and determine the best way to mitigate the situation. The parameters internalQueryExecYieldIterations/internalQueryExecYieldPeriodMS have been suggested as a possible work around, but runtime effects of changing the parameters should be evaluated.

            lamont.nelson@mongodb.com Lamont Nelson
            lamont.nelson@mongodb.com Lamont Nelson
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