Enable safeRestore config and retry op on recovery#548
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Zee2413
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Apr 28, 2026
| if (this.closed) return; | ||
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| try { | ||
| const staleLocks = this.env.readerCheck(); |
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readerCheck clears out stale reader transaction entries from the reader lock table.
LMDB uses a shared lock table to track active read transactions across processes/threads. If a process crashes or exits without properly closing its read transaction, its entry remains in the table as a stale reader. Stale readers are problematic because LMDB can't reclaim database pages that were in use at the time of that reader's snapshot - this causes the database file to grow continuously since old pages can never be freed.
db.readerCheck() scans the reader lock table, detects entries belonging to processes/PIDs that no longer exist, and clears them. It returns the number of stale entries that were removed.
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safeRestoreconfiguration for LMDB - https://github.com/kriszyp/lmdb-js#readme