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  1. WiredTiger
  2. WT-4323

Fix race between setting transaction read_timestamp and updating global pinned timestamp

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    • 3
    • Storage Engines 2018-09-24

    Description

      When updating oldest_timestamp we also  txn_update_pinned_timestamp where we fetch the current pinned timestamp, do some validations and under a write lock update the txn_global->pinned_timestamp. It is possible that between the time of fetch and update, the actual pinned timestamp moved backward due to a new transaction with a read_timestamp older than the current pinned timestamp . The new transaction began successfully because it started before the oldest_timestamp update thread. But the transaction commit or rollback would fail because it would see pinned is ahead of the transaction's read_timestamp.

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              neha.khatri Neha Khatri
              neha.khatri Neha Khatri
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