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  1. MariaDB Connector/J
  2. CONJ-970

No records returned with useServerPrepStmts and large result size

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Won't Fix
    • Affects Version/s: 2.3.0, 2.7.5
    • Fix Version/s: N/A
    • Component/s: Other
    • Labels:
      None

      Description

      There is a bug that is apparent in multiple MariaDB versions, where records are not being returned if useServerPrepStmts is true and the batch size is >= 1000. What happens is that only the last batch is returned and all the previous ones are returned empty.

      MariaDB versions that trigger the bug: 10.3.34, 10.5.15, 10.6.7, 10.7.3, 10.8.2
      MariaDB versions that do not trigger the bug: 10.3.32, 10.5.12.1, 10.5.13

      You can find a Java class attached that can be used to demonstrate the bug on a MariaDB database. This basically populates a MariaDB table with seedCount ids. Then, it performs a query on that table in a sequence of operations, each covering a subset of the id values to be queried (called batchSize).

      Below, there are different executions of the BugDemo.java class that showcase the bug. The MariaDB version in this case is 10.5.15 and the seedCount is 2500.

      Case 1:

      • useServerPrepStmts: true
      • batchSize: 1000
        Output:

        DB version: 10.5.15-MariaDB
        Total records available: 2500
        Batch retrieved record count: 0
        Batch retrieved record count: 0
        Batch retrieved record count: 500
        Total records retrieved: 500
        Not all records retrieved: bug was triggered
        

      Case 2:

      • useServerPrepStmts: false
      • batchSize: 1000
        Output:

        DB version: 10.5.15-MariaDB
        Total records available: 2500
        Batch retrieved record count: 1000
        Batch retrieved record count: 1000
        Batch retrieved record count: 500
        Total records retrieved: 2500
        All records retrieved: bug was not triggered
        

      Case 3:

      • useServerPrepStmts: true
      • batchSize: 999
        Output:

        DB version: 10.5.15-MariaDB
        Total records available: 2500
        Batch retrieved record count: 999
        Batch retrieved record count: 999
        Batch retrieved record count: 502
        Total records retrieved: 2500
        All records retrieved: bug was not triggered
        

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              Assignee:
              diego dupin Diego Dupin
              Reporter:
              manosvek Manos Vekrakis
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                Dates

                Created:
                Updated:
                Resolved:

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