Summary:
**Context:**
Inside `BlockBasedTableBuilder::WriteRawBlock`, there are multiple places that change local variables `io_s` and `s` while
depend on them. This PR attempts to clarify the relevant logics so that it's easier to read and add places of changing these local variables later (like https://github.com/facebook/rocksdb/pull/9342.) without changing the current behavior.

**Summary:**
- Shorten the lifetime of local var `io_s` and `s` as much as possible to avoid if-else branches by early return

**Test**
- Reasoned against original behavior to verify new changes do not break existing behaviors.
- Rely on CI tests since we are not changing current behavior.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9393

Reviewed By: pdillinger

Differential Revision: D33626095

Pulled By: hx235

fbshipit-source-id: 6184d1e1d85d2650d16617c449971988d062ed3f

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9429

Test Plan: fake release for test: D33754513

Reviewed By: riversand963

Differential Revision: D33753637

Pulled By: jay-zhuang

fbshipit-source-id: 18db4701e8f28dda8f1ab660c2be9890a8312c12

Summary:
There is a race in SstFileManagerImpl between the ClearError() function
and CancelErrorRecovery(). The race can cause ClearError() to deref the
file system pointer after it has been freed. This is likely to occur
during process shutdown, when the order of destruction of the
DB/Env/FileSystem and SstFileManagerImpl is not deterministic.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9435

Test Plan:
Reproduce the crash in a TSAN build by introducing sleeps in the code, and verify with
the fix.

Reviewed By: siying

Differential Revision: D33774696

Pulled By: anand1976

fbshipit-source-id: 643d3da31b8d2ee6d9b6db5d33327e0053ce3b83

Summary:
RocksDB has marked DB::AddFile() as "DEPRECATED_FUNC" for a long time, and
it will be removed in the upcoming 7.0 release.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9433

Test Plan: make check -j64; CircleCI

Reviewed By: riversand963

Differential Revision: D33763987

Pulled By: akankshamahajan15

fbshipit-source-id: a3407324479bb43689e1213e4e29d53095e7579a

Summary:
db_stress listener service always uses default filesystem to operate,
causing it to not recognize custom filesystem (like ZenFS plugin FS).
Pass the env to db_stress listener with the correct filesystem
information, so it can open the user intended filesystem.
Signed-off-by: NAravind Ramesh <Aravind.Ramesh@wdc.com>

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9352

Reviewed By: riversand963

Differential Revision: D33776762

Pulled By: pdillinger

fbshipit-source-id: e79bb9a544384f80ae9dd0108241ab9c83223954

Summary:
Make `AdvancedColumnFamilyOptions.bottommost_temperature`
dynamically changeable with `SetOptions` API.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9402

Test Plan: added unittest

Reviewed By: siying

Differential Revision: D33674487

Pulled By: jay-zhuang

fbshipit-source-id: 8943768156aa6197c63850a64238a8092527d517

Summary:
Right now, when error happens in block based table reader, we still call index_builder->Finish(), this causes one assertion in one stress test:

db_stress: table/block_based/index_builder.cc:202: virtual rocksdb::Status rocksdb::PartitionedIndexBuilder::Finish(rocksdb::IndexBuilder::IndexBlocks*, const rocksdb::BlockHandle&): Assertion `sub_index_builder_ == nullptr' failed.

This unlikely causes any corruption as we would finally abandon the file, but the code is confusing and it is hard to understand what would happen. Changing the behavior.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9426

Test Plan: Run existing tests

Reviewed By: pdillinger

Differential Revision: D33751929

fbshipit-source-id: 3c916b9444a4171010fc53df40496570bef5ae7a

Summary:
This PR moves RADOS support from RocksDB repo to a separate repo. The new (temporary?) repo
in this PR serves as an example before we finalize the decision on where and who to host RADOS support. At this point,
people can start from the example repo and fork.

The goal is to include this commit in RocksDB 7.0 release.

Reference:
https://github.com/ajkr/dedupfs by ajkr

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9206

Test Plan:
Follow instructions in https://github.com/riversand963/rocksdb-rados-env/blob/main/README.md and build
test binary `env_librados_test` and run it.

Also, make check

Reviewed By: ajkr

Differential Revision: D33751690

Pulled By: riversand963

fbshipit-source-id: 30466c62afa9e4619847a48567ed158e62835e35

Summary:
This PR is one proposal to resolve https://github.com/facebook/rocksdb/issues/9382.

Looking at the code, I can't think of a reason why rdb is an internal component of RocksDB: it does not require
any header files NOT in `include/rocksdb`. It's a better idea to host it somewhere else.

Plus, rdb requires python2 which is not supported any more. No fixes or improvements will be made, even for potential
security bugs (https://www.python.org/doc/sunset-python-2/).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9399

Test Plan: make check

Reviewed By: ajkr

Differential Revision: D33641965

Pulled By: riversand963

fbshipit-source-id: 2a6a74693e5de36834f355e41d6865db206af48b

Summary:
This PR moves HDFS support from RocksDB repo to a separate repo. The new (temporary?) repo
in this PR serves as an example before we finalize the decision on where and who to host hdfs support. At this point,
people can start from the example repo and fork.

Java/JNI is not included yet, and needs to be done later if necessary.

The goal is to include this commit in RocksDB 7.0 release.

Reference:
https://github.com/ajkr/dedupfs by ajkr

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9170

Test Plan:
Follow the instructions in https://github.com/riversand963/rocksdb-hdfs-env/blob/master/README.md. Build and run db_bench and db_stress.

make check

Reviewed By: ajkr

Differential Revision: D33751662

Pulled By: riversand963

fbshipit-source-id: 22b4db7f31762ed417a20239f5a08dcd1696244f

Summary:
We see:

[ RUN      ] ChrootEnvWithDirectIO/EnvPosixTestWithParam.RunMany/0
env/env_test.cc:464: Failure
Expected equality of these values:
  4
  cur
    Which is: 0

The suspicious is that the wait time is not long enough. Increase the wait time to 10s and allows earlier check.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9413

Test Plan: Run the test

Reviewed By: riversand963

Differential Revision: D33697715

fbshipit-source-id: 3d71715562a8cceb694b773276dd9e4e451a18bc

Summary:
Update version for 6.29 release

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9418

Reviewed By: riversand963

Differential Revision: D33721048

Pulled By: anand1976

fbshipit-source-id: e73602ee1c829c2e47ce6e181bca4db7cb663979

Summary:
It appears that VS2017 is covered in CircleCI so we don't need it in Appveyor. Also, currently Appveyor has some problem with installing VS2017.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9417

Test Plan: Watch Appveyor run.

Reviewed By: riversand963

Differential Revision: D33719364

fbshipit-source-id: 7f31bf056eeaf487b372881f85d134dc0fe5832a

Summary:
Loose ends relate to mmap on 32-bit systems. (Testing is more
complicated when the feature was completely disabled on 32-bit.)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9386

Test Plan: CI

Reviewed By: ajkr

Differential Revision: D33590715

Pulled By: pdillinger

fbshipit-source-id: f2637036a538a552200adee65b6765fce8cae27b

Summary:
Fixes a major performance regression in 6.26, where
extra CPU is spent in SliceTransform::AsString when reads involve
a prefix_extractor (Get, MultiGet, Seek). Common case performance
is now better than 6.25.

This change creates a "fast path" for verifying that the current prefix
extractor is unchanged and compatible with what was used to
generate a table file. This fast path detects the common case by
pointer comparison on the current prefix_extractor and a "known
good" prefix extractor (if applicable) that is saved at the time the
table reader is opened. The "known good" prefix extractor is saved
as another shared_ptr copy (in an existing field, however) to ensure
the pointer is not recycled.

When the prefix_extractor has changed to a different instance but
same compatible configuration (rare, odd), performance is still a
regression compared to 6.25, but this is likely acceptable because
of the oddity of such a case. The performance of incompatible
prefix_extractor is essentially unchanged.

Also fixed a minor case (ForwardIterator) where a prefix_extractor
could be used via a raw pointer after being freed as a shared_ptr,
if replaced via SetOptions.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9407

Test Plan:
## Performance
Populate DB with `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom -num=10000000 -disable_wal=1 -write_buffer_size=10000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -prefix_size=12`

Running head-to-head comparisons simultaneously with `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -use_existing_db -readonly -benchmarks=seekrandom -num=10000000 -duration=20 -disable_wal=1 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -prefix_size=12`

Below each is compared by ops/sec vs. baseline which is version 6.25 (multiple baseline runs because of variable machine load)

v6.26: 4833 vs. 6698 (<- major regression!)
v6.27: 4737 vs. 6397 (still)
New: 6704 vs. 6461 (better than baseline in common case)
Disabled fastpath: 4843 vs. 6389 (e.g. if prefix extractor instance changes but is still compatible)
Changed prefix size (no usable filter) in new: 787 vs. 5927
Changed prefix size (no usable filter) in new & baseline: 773 vs. 784

Reviewed By: mrambacher

Differential Revision: D33677812

Pulled By: pdillinger

fbshipit-source-id: 571d9711c461fb97f957378a061b7e7dbc4d6a76

Summary:
* remove pyenv installation step which is not needed (it takes 3 minutes to install for every job and fail from time to time)
* download compression lib fail from time to time, Uploaded the libs to S3 and download from them for CI, which should be more stable.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9406

Test Plan: CI

Reviewed By: riversand963

Differential Revision: D33700158

Pulled By: jay-zhuang

fbshipit-source-id: be7b172d7cd059c9d7b3139fd7a34f8070460e31

Summary:
Wasn't able to easily reproduce error, but easy to see a race
condition between TestFlushListener::OnFlushCompleted and
DBTestBase::Close(), which frees CF handles before closing DB.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9400

Test Plan: CI etc.

Reviewed By: riversand963

Differential Revision: D33645134

Pulled By: pdillinger

fbshipit-source-id: d0ec914cc43c9e14f53da633876b95b61995138d

Summary:
xcode 11.3.1 is deprecated https://circleci.com/docs/2.0/testing-ios/ , jobs are failing:
```
failed to create host: Image xcode:11.3.0 is not supported
```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9405

Test Plan: CI

Reviewed By: ajkr, hx235

Differential Revision: D33674462

Pulled By: jay-zhuang

fbshipit-source-id: 85dd27aad84d26eaaa5c5375015344182b2c50b9

Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9404

It is better practice to mark destructors as override. Without this
change there can be issues building with
-Wsuggest-destructor-override.

Reviewed By: riversand963

Differential Revision: D33671992

fbshipit-source-id: 75b0c15010cbab5fbc071c150fef1dc85d5d9d96

Summary:
The old block-based filter has been deprecated for years, but
this makes that more clear by marking the functions specific to it and
logging a warning when the feature is used.

It is deprecated because of performance. In that old design, you have to
binary search through the full SST index before a bloom filter query, which
is much more expensive than a bloom query itself.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9403

Test Plan:
Used db_bench with and without -use_block_based_filter,
running at the same time

    TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom,readrandom -num=10000000 -duration=20 -disable_wal=1 -write_buffer_size=10000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0

No significant difference in construction time but 3x slower readrandom
with -use_block_based_filter:
readrandom   :     100.517 micros/op 9948 ops/sec;    1.1 MB/s
vs.
readrandom   :      33.368 micros/op 29968 ops/sec;    3.3 MB/s

Also saw deprecation message (just once) in LOG only with
-use_block_based_filter

Reviewed By: ajkr

Differential Revision: D33673202

Pulled By: pdillinger

fbshipit-source-id: 99f6f0eff619408d9e5f7ef546954ed0be6c7a5b

Summary:
Need this until we properly return an error or fix the combination. Reported in https://github.com/facebook/rocksdb/issues/9255.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9398

Reviewed By: riversand963

Differential Revision: D33641396

Pulled By: ajkr

fbshipit-source-id: 9fe804108f7b93912f5b9c7252ac49acedc4f805

Summary:
**Context/Summary:**
There are two `RateLimiter::Request()` in public header. One of them is missing some comment that the other one has.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9392

Test Plan: rely on CI test

Reviewed By: pdillinger

Differential Revision: D33623609

Pulled By: hx235

fbshipit-source-id: 42dc06308ff0bcf5ee7ef67e0b1c0172fc239b20

Summary:
Closing https://github.com/facebook/rocksdb/issues/5954

fsync/fdatasync on Linux:
```
(fsync/fdatasync) includes writing through or flushing a disk cache if present.
```

However, on OS X and iOS:
```
(fsync) will flush all data from the host to the drive (i.e. the "permanent storage device"),
the drive itself may not physically write the data to the platters for quite some time and it
may be written in an out-of-order sequence.
```

Solution is to use `fcntl(F_FULLFSYNC)` on OS X so that we get the same
persistence guarantee.

According to OSX man page,
```
The F_FULLFSYNC fcntl asks the drive to flush **all** buffered data to permanent storage.
```
This suggests that it will be no faster than `fsync` on Linux, since Linux, according to its man page,
```
writing through or flushing a disk cache if present
```
It means Linux may not flush **all** data from disk cache.

This is similar to bug reports/fixes in:
- golang: https://github.com/golang/go/issues/26650
- leveldb: https://github.com/google/leveldb/commit/296de8d5b8e4e57bd1e46c981114dfbe58a8c4fa.

Not sure if we should fallback to fsync since we break persistence contract.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9356

Reviewed By: jay-zhuang

Differential Revision: D33417416

Pulled By: riversand963

fbshipit-source-id: 475548ff9c5eaccde325e0f6842694271cbc8cb7

Summary:
In response to https://github.com/facebook/rocksdb/issues/9354, this PR adds a way for users to "opt out"
of extra checks that can impact peak write performance, which
currently only includes force_consistency_checks. I considered including
some other options but did not see a db_bench performance difference.

Also clarify in comment for force_consistency_checks that it can "slow
down saturated writing."

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9363

Test Plan:
basic coverage in unit tests

Using my perf test in https://github.com/facebook/rocksdb/issues/9354 comment, I see

force_consistency_checks=true -> 725360 ops/s
force_consistency_checks=false -> 783072 ops/s

Reviewed By: mrambacher

Differential Revision: D33636559

Pulled By: pdillinger

fbshipit-source-id: 25bfd006f4844675e7669b342817dd4c6a641e84

Summary:
We are phasing out the slack channel, but keeping the Google
Group email list.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9387

Test Plan: no code

Reviewed By: riversand963

Differential Revision: D33591265

Pulled By: pdillinger

fbshipit-source-id: 48e45a74753d05611db2c8f4efc4de16a1f50e70

Summary:
Replace `-o /dev/null` by `-o test.o` when testing for C++ features such as
-faligned-new otherwise tests will fail with some bugged binutils
(https://sourceware.org/bugzilla/show_bug.cgi?id=19526):

```
output/host/bin/xtensa-buildroot-linux-uclibc-g++ -faligned-new -x c++ - -o /dev/null <<EOF
            struct alignas(1024) t {int a;};
            int main() {}
EOF
/home/fabrice/buildroot/output/host/lib/gcc/xtensa-buildroot-linux-uclibc/8.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: final link failed: file truncated

```
Signed-off-by: NFabrice Fontaine <fontaine.fabrice@gmail.com>

Pull Request resolved: https://github.com/facebook/rocksdb/pull/6479

Reviewed By: ajkr

Differential Revision: D33574136

Pulled By: riversand963

fbshipit-source-id: 12b48658b17e36013042c98219b89ddf71161d3c

Summary:
Range Locking supports Lock Escalation. Lock Escalation is invoked when
lock memory is nearly exhausted and it reduced the amount of memory used
by joining adjacent locks.

Bridging the gap between certain locks has adverse effects. For example,
in MyRocks it is not a good idea to bridge the gap between locks in
different indexes, as that get the lock to cover large portions of
indexes, or even entire indexes.

Resolve this by introducing Escalation Barrier. The escalation process
will call the user-provided barrier callback function:
   bool(const Endpoint& a, const Endpoint& b)

If the function returns true, there's a barrier between a and b and Lock
Escalation will not try to bridge the gap between a and b.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9290

Reviewed By: akankshamahajan15

Differential Revision: D33486753

Pulled By: riversand963

fbshipit-source-id: f97910b67aba0579ea1d35f523ca6863d3dd018e

Summary:
Closes https://github.com/facebook/rocksdb/issues/9271

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9294

Reviewed By: riversand963, hx235

Differential Revision: D33586002

Pulled By: pdillinger

fbshipit-source-id: 3d1a2fa71023e108613ff03dbd37a5f954fc4920

Summary:
Fixes facebook/rocksdb#7720

Updated Makefile with flags to define target architecture when compiling/linking,
and added goal `rocksdbjavastaticosxub` to build a OS X Universal Binary native library.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9254

Reviewed By: mrambacher

Differential Revision: D33551160

Pulled By: pdillinger

fbshipit-source-id: 9ce9962e03aacf55014545a6cdf638b5b14b8fa9

Summary:
As title.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9383

Test Plan:
manually add `using namespace` to a file, and run `make check-sources`.
Then, remove `using namespace`, and run `make check-sources`

Reviewed By: ajkr

Differential Revision: D33551706

Pulled By: riversand963

fbshipit-source-id: 1bb8304f38434da7de0656882e62e77673155725

Summary:
Fix https://github.com/facebook/rocksdb/issues/8046 : FlushMemTable return ok but memtable does not synchronize flush. The way to fix it is to expose RecoveryError.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8173

Reviewed By: ajkr

Differential Revision: D31674552

Pulled By: jay-zhuang

fbshipit-source-id: 9d16b69ba12a196bb429332ec8224754de97773d

Summary:
As title.
This is part of an fb-internal task.
First, remove all `using namespace` statements if applicable.
Next, utilize multiple build platforms and see if anything is broken.
Should anything become broken, fix the compilation errors with as little extra change as possible.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9369

Test Plan:
internal build and make check
make clean && make static_lib && cd examples && make all

Reviewed By: pdillinger

Differential Revision: D33517260

Pulled By: riversand963

fbshipit-source-id: 3fc4ce6402a073421dfd9a9b2d1c79441dca7a40

Summary:
With memkind installed, either on a non-fb machine or using `ROCKSDB_NO_FBCODE=1`.

```
ROCKSDB_NO_FBCODE=1 make static_lib
```

Compilation failed due to unused variable warning treated as error. To bypass this, we need to
disable warning-as-error, which is not ideal.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9377

Test Plan: Repeat the above command, and rely on CI.

Reviewed By: ajkr

Differential Revision: D33543343

Pulled By: riversand963

fbshipit-source-id: 9a2790b38c00b8696c7910287f4ae5a9b394341d

Summary:
Compatible change, more natural (especially in generated Rust bindings), no risk that the API will ever need mutable access because it has to make a copy anyway.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9376

Reviewed By: ajkr

Differential Revision: D33541435

Pulled By: pdillinger

fbshipit-source-id: 15c512a0d70b6e8694fa99d598b7d022751c1e59

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9374

Test Plan: Add CI for clang13 build

Reviewed By: riversand963

Differential Revision: D33522867

Pulled By: jay-zhuang

fbshipit-source-id: 642756825cf0b51e35861fb847ebaee4611b76ca

Restore Regex support for ObjectLibrary::Register, rename new APIs to allow old one to be deprecated in the future (#9362)

Summary:
In order to support old-style regex function registration, restored the original "Register<T>(string, Factory)" method using regular expressions.  The PatternEntry methods were left in place but renamed to AddFactory.  The goal is to allow for the deprecation of the original regex Registry method in an upcoming release.

Added modes to the PatternEntry kMatchZeroOrMore and kMatchAtLeastOne to match * or +, respectively (kMatchAtLeastOne was the original behavior).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9362

Reviewed By: pdillinger

Differential Revision: D33432562

Pulled By: mrambacher

fbshipit-source-id: ed88ab3f9a2ad0d525c7bd1692873f9bb3209d02

Summary:
The random string may contain the string we're checking, e.g.:
```
ADD - 206FBC78E96BC4C6A2DDDDC0AD5D1ADD - 111
```
Only check the line starts-with "ADD -".

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9373

Test Plan: `gtest-parallel ./sim_cache_test --gtest_filter=SimCacheTest.SimCacheLogging -r 1000`

Reviewed By: riversand963

Differential Revision: D33519574

Pulled By: jay-zhuang

fbshipit-source-id: d0c1c9b0b489246d292e7da4133030edaa748099

Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9370

GCC and newer clang, e.g. clang-12 treat `std::unique_ptr` slightly differently.
For the following code
```
#include <iostream>
#include <memory>
#include <type_traits>

struct A {
    std::unique_ptr<int> m1;
};

int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_standard_layout<A>::value << '\n';
    return 0;
}
```
GCC11(C++20) (tested on https://en.cppreference.com/w/cpp/types/is_standard_layout) will print "true", while newer clang, e.g. clang-12 will print "false". This breaks the usage of `offsetof()` on structs with non-static members of type `std::unique_ptr`.
Fixing this by replacing the builtin `offsetof` with a trick documented at https://gist.github.com/graphitemaster/494f21190bb2c63c5516.

Reviewed By: jay-zhuang

Differential Revision: D33420840

fbshipit-source-id: 02bde281dfa28809bec787ad0f7019e85dd9c607

Summary:
This change adds the filename of the offending filen to several place that produce Status objects with code `kCorruption`.
This is not an attempt to have every Corruption message in the codebase extended with the filename, but it is a start.
The motivation for the change was to quickly diagnose which file is corrupted when a large database is openend and there is not option to copy it offsite for analysis, run strace or install the ldb tool.
In the particular case in question, the error message improved from a mere
```
Corruption: checksum mismatch
```
to
```
Corruption: checksum mismatch in file /path/to/db/engine-rocksdb/MANIFEST-000171
```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9239

Reviewed By: jay-zhuang

Differential Revision: D33237742

Pulled By: riversand963

fbshipit-source-id: bd42559cfbf786a0a674d091671d1a2bf07bdd31

Summary:
Function `Version::UpdateFilesByCompactionPri()` is never called and not implemented.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8724

Reviewed By: ajkr

Differential Revision: D30643943

Pulled By: riversand963

fbshipit-source-id: 174b2d9a2a42e286222909a035cc74a7b5602335