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  1. MariaDB ColumnStore
  2. MCOL-5852

GROUP_CONCAT in query uses enormous amount of RAM causing OOM to kill PrimProc

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Details

    • Bug
    • Status: In Progress (View Workflow)
    • Critical
    • Resolution: Unresolved
    • 23.10.2
    • None
    • ExeMgr, PrimProc

    Description

      When a query has the `GROUP_CONCAT` keyword, it executes for a short while, and dies off with the below error:

      ERROR 1815 (HY000): Internal error: InetStreamSocket::readToMagic: Remote is closed
      

      This is due to `OOM` killing the `PrimProc` service.

      Parameter values of note, we have:

      mcsSetConfig HashJoin TotalUmMemory 50%  --previous value 25%, same issue.
      mcsSetConfig HashJoin AllowDiskBasedJoin N --previous value Y, same issue.
      

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            alexey.antipovsky Alexey Antipovsky
            michael.amadi Michael Amadi
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            Dates

              Created:
              Updated:

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