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  1. MariaDB ColumnStore
  2. MCOL-4330

MDB hangs asking data from I_S.columnstore_extents or I_S.columnstore_files

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.5.3, 1.4.3-5
    • Fix Version/s: 5.4.1
    • Component/s: None
    • Labels:
      None
    • Sprint:
      2020-8

      Description

      The problem happens when MCS is restarted but MDB isn't. This causes MDB to point to the deleted BRM segments in shmem b/c MCS recreates them.
      4QA To reproduce run MDB+MCS, restart MCS but not MDB and then run this bash snippet to fill ExtentMap

      for e in $(seq 0 50); do mysql -e 'create table cs1(i bigint, i2 bigint, i3 bigint, i4 bigint)engine=columnstore' test; mysql -e 'drop table cs1' test; done
      

      Then try to query from information_schema.columnstore_extents. MDB must hang after this.

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            Assignee:
            dleeyh Daniel Lee
            Reporter:
            drrtuy Roman
            Votes:
            1 Vote for this issue
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              Updated:
              Resolved:

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