Summary:
When `avoid_flush_during_shutdown` is false, DB will flush the memtables if there is some unpersisted data:
79790cf2a8/db/db_impl/db_impl.cc (L505-L510)
`has_unpersisted_data_` is a flag that is only turned on for when WAL is disabled, for example:
79790cf2a8/db/db_impl/db_impl_write.cc (L525-L528)
In other cases, it just has its default false value.
So if disableWAL is false, and avoid_flush_during_shutdown is false, close won't flush memtables. Stress test is also not flush wal/sync wal. There could be missing data, while reopen in stress test doesn't tolerate missing data. To make the test simpler, this changes it to always flush/sync wal during reopen.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/13039
Reviewed By: hx235
Differential Revision: D63494695
Pulled By: jowlyzhang
fbshipit-source-id: 8f0fd9ed50a482a3955abc0882257ecc2e95926d
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team.
It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com)
and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast
key-value server, especially suited for storing data on flash drives.
It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs
between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF)
and Space-Amplification-Factor (SAF). It has multi-threaded compactions,
making it especially suitable for storing multiple terabytes of data in a
single database.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.
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