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Issue 52885: Deadlock under heavy server load running post-commit tasks #6584

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Rationale

We can end up with a connection pool/ContainerManager deadlock (or at least heavy contention) during server load.

Changes

  • Use same connection to run post-commit tasks instead of returning to the pool and trying to get a new one
  • Cache containers by RowId too
  • Ensure that we call _closeOnClose

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