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Summary: - Add experimental immutable `DBOptions::async_wal_precreate` to reserve and open one future WAL on a background HIGH-priority task, with sanitization that disables the optimization when WAL recycling is configured. - Split WAL creation into open/preallocate and start phases so `SwitchMemtable()` can consume a prepared WAL after writing normal WAL metadata, wait for in-flight precreation, fall back to synchronous creation, and delete an unstarted prepared WAL on start failure. - Keep WAL numbering, close, recovery, and read-only open safe for empty future WAL files left by async precreation; `error_if_wal_file_exists=true` now rejects non-empty WALs while tolerating empty WALs. - Add public option plumbing for the C API, options parsing/stringification, random option testing, `db_bench`, `db_stress`, and crash-test configuration. - Add WAL precreate statistics counters plus Java `TickerType`/JNI mappings, and update C++, C, and Java read-only-open documentation for the empty-WAL behavior. - Add focused WAL/option/C/Java tests for async precreate ready/wait/failure/recovery paths, read-only WAL detection, option sanitization, and API plumbing, plus write-flow docs and unreleased history entries for the new feature and behavior change. PR https://github.com/facebook/rocksdb/pull/14738 Reviewed By: pdillinger Differential Revision: D105020559 fbshipit-source-id: 5059b424702e021abb8de65ceeb6d3b975280ffc |
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| test/java/org/rocksdb | ||