Summary:
As you know, almost all compilers support "pragma once" keyword instead of using include guards. To be keep consistency between header files, all header files are edited.

Besides this, try to fix some warnings about loss of data.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4339

Differential Revision: D9654990

Pulled By: ajkr

fbshipit-source-id: c2cf3d2d03a599847684bed81378c401920ca848

Summary:
We want to sample the file I/O issued by RocksDB and report the function calls. This requires us to include the file paths otherwise it's hard to tell what has been going on.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4039

Differential Revision: D8670178

Pulled By: riversand963

fbshipit-source-id: 97ee806d1c583a2983e28e213ee764dc6ac28f7a

Summary:
Although delete scheduler implementation allows for the interface not to be supported, the delete_scheduler_test does not allow for that.
Address compiler warnings
Make sst_dump_test use test directory structure as the current execution directory may not be writiable.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4221

Differential Revision: D9210152

Pulled By: siying

fbshipit-source-id: 381a74511e969ecb8089d5c4b4df87dc30c8df63

Summary:
Fix a crash in `WinEnvIO::GetSectorSize` that happens on old Windows systems (e.g Windows 7).
On old Windows systems that don't support querying StorageAccessAlignmentProperty using IOCTL_STORAGE_QUERY_PROPERTY, the flow calls a different DeviceIoControl with nullptr as lpBytesReturned.
When the code reaches this point, we get an access violation.
Closes https://github.com/facebook/rocksdb/pull/3975

Differential Revision: D8385186

Pulled By: ajkr

fbshipit-source-id: fae4c9b4b0a52c8a10182e1b35bcaa30dc393bbb

Summary:
Catch up with Posix features
  NewWritableRWFile must fail when file does not exists
  Implement Env::Truncate()
  Adjust Env options optimization functions
  Implement MemoryMappedBuffer on Windows.
Closes https://github.com/facebook/rocksdb/pull/3857

Differential Revision: D8053610

Pulled By: ajkr

fbshipit-source-id: ccd0d46c29648a9f6f496873bc1c9d6c5547487e

Summary:
Delete archive directory before WAL folder
  since archive may be contained as a subfolder.
  Also improve loop readability.
Closes https://github.com/facebook/rocksdb/pull/3797

Differential Revision: D7866378

Pulled By: riversand963

fbshipit-source-id: 0c45d97677ce6fbefa3f8d602ef5e2a2a925e6f5

Summary:
This patch addressed several issues.
  Portability including db_test std::thread -> port::Thread Cc: @
  and %z to ROCKSDB portable macro. Cc: maysamyabandeh

  Implement Env::AreFilesSame

  Make the implementation of file unique number more robust

  Get rid of C-runtime and go directly to Windows API when dealing
  with file primitives.

  Implement GetSectorSize() and aling unbuffered read on the value if
  available.

  Adjust Windows Logger for the new interface, implement CloseImpl() Cc: anand1976

  Fix test running script issue where $status var was of incorrect scope
  so the failures were swallowed and not reported.

  DestroyDB() creates a logger and opens a LOG file in the directory
  being cleaned up. This holds a lock on the folder and the cleanup is
  prevented. This fails one of the checkpoin tests. We observe the same in production.
  We close the log file in this change.

 Fix DBTest2.ReadAmpBitmapLiveInCacheAfterDBClose failure where the test
 attempts to open a directory with NewRandomAccessFile which does not
 work on Windows.
  Fix DBTest.SoftLimit as it is dependent on thread timing. CC: yiwu-arbug
Closes https://github.com/facebook/rocksdb/pull/3552

Differential Revision: D7156304

Pulled By: siying

fbshipit-source-id: 43db0a757f1dfceffeb2b7988043156639173f5b

Summary:
- Use `__unused__` everywhere
- Suppress unused warnings in Release mode
    + This currently affects non-MSVC builds (e.g. mingw64).
Closes https://github.com/facebook/rocksdb/pull/3448

Differential Revision: D6885496

Pulled By: miasantreble

fbshipit-source-id: f2f6adacec940cc3851a9eee328fafbf61aad211

Summary:
FILE_FLAG_WRITE_THROUGH is for disabling device on-board cache in windows API, which should be disabled if user doesn't need system cache.
There was a perf issue related with this, we found during memtable flush, the high percentile latency jumps significantly. During profiling, we found those high latency (P99.9) read requests got queue-jumped by write requests from memtable flush and takes 80ms or even more time to wait, even when SSD overall IO throughput is relatively low.

After enabling FILE_FLAG_WRITE_THROUGH, we rerun the test found high percentile latency drops a lot without observable impact on writes.

Scenario 1: 40MB/s + 40MB/s  R/W compaction throughput

 Original | FILE_FLAG_WRITE_THROUGH | Percentage reduction
---------------------------------------------------------------
P99.9 | 56.897 ms | 35.593 ms | -37.4%
P99 | 3.905 ms | 3.896 ms | -2.8%

Scenario 2:  14MB/s + 14MB/s R/W compaction throughput, cohosted with 100+ other rocksdb instances have manually triggered memtable flush operations (memtable is tiny), creating a lot of randomized the small file writes operations during test.

Original | FILE_FLAG_WRITE_THROUGH | Percentage reduction
---------------------------------------------------------------
P99.9 | 86.227   ms | 50.436 ms | -41.5%
P99 | 8.415   ms | 3.356 ms | -60.1%
Closes https://github.com/facebook/rocksdb/pull/3225

Differential Revision: D6624174

Pulled By: miasantreble

fbshipit-source-id: 321b86aee9d74470840c70e5d0d4fa9880660a91

Summary:
The DBOptions::writable_file_max_buffer_size can be changed dynamically.
Closes https://github.com/facebook/rocksdb/pull/3053

Differential Revision: D6152720

Pulled By: shligit

fbshipit-source-id: aa0c0cfcfae6a54eb17faadb148d904797c68681

Summary:
MSVC does not support unused attribute at this time. A separate assignment line fixes the issue probably by being counted as usage for MSVC and it no longer complains about unused var.
Closes https://github.com/facebook/rocksdb/pull/3048

Differential Revision: D6126272

Pulled By: maysamyabandeh

fbshipit-source-id: 4907865db45fd75a39a15725c0695aaa17509c1f

Summary: Closes https://github.com/facebook/rocksdb/pull/2702

Differential Revision: D5585389

Pulled By: ajkr

fbshipit-source-id: cb54041eb481d0d759c440f82a8a2c5b34534173

Summary: Closes https://github.com/facebook/rocksdb/pull/2589

Differential Revision: D5431502

Pulled By: siying

fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75

Summary:
Make default impl return NoSupported so the db_blob
  tests exist in a meaningful manner.
  Replace std::thread to port::Thread
Closes https://github.com/facebook/rocksdb/pull/2465

Differential Revision: D5275563

Pulled By: yiwu-arbug

fbshipit-source-id: cedf1a18a2c05e20d768c1308b3f3224dbd70ab6

Summary:
cc tamird sagar0
Closes https://github.com/facebook/rocksdb/pull/2325

Differential Revision: D5098302

Pulled By: sagar0

fbshipit-source-id: 297c5506b5d9b2ed1d7719c8caf0b96cffe503b8

Summary:
Previously users could set `max_background_flushes=0` to force rocksdb to use a single thread pool for both background flushes and compactions. That'll no longer be possible since I'm going to deprecate `max_background_flushes` and `max_background_compactions` in favor of a single option. This diff introduces a new way to force a single thread pool: when high-pri pool has zero threads, all background jobs will be submitted to low-pri pool.

Note the majority of the code change is adding `Env::GetBackgroundThreads()`, which is necessary to check whether the user has provided a zero-sized thread pool.
Closes https://github.com/facebook/rocksdb/pull/2204

Differential Revision: D4936256

Pulled By: ajkr

fbshipit-source-id: 929a07a0c0705f7766f5339cd013ff74e90d6e01

Summary:
This was exposed by a48a62d5, which made NDEBUG the default for cmake
builds.
Closes https://github.com/facebook/rocksdb/pull/2315

Differential Revision: D5079583

Pulled By: sagar0

fbshipit-source-id: c614e96a40df016a834a62b6236852265e7ee4db

Summary:
- downcase includes for case-sensitive filesystems
- give targets the same name (librocksdb) on all platforms

With this patch it is possible to cross-compile RocksDB for Windows
from a Linux host using mingw.

cc yuslepukhin orgads
Closes https://github.com/facebook/rocksdb/pull/2107

Differential Revision: D4849784

Pulled By: siying

fbshipit-source-id: ad26ed6b4d393851aa6551e6aa4201faba82ef60

Summary: Closes https://github.com/facebook/rocksdb/pull/2226

Differential Revision: D4967547

Pulled By: siying

fbshipit-source-id: dd3b58ae1e7a106ab6bb6f37ab5c88575b125ab4

Summary:
Move some files under util/ to new directories env/, monitoring/ options/ and cache/
Closes https://github.com/facebook/rocksdb/pull/2090

Differential Revision: D4833681

Pulled By: siying

fbshipit-source-id: 2fd8bef

Summary:
There still are many warnings (most of them about invalid printf format
for long long), but it builds if FAIL_ON_WARNINGS is disabled.
Closes https://github.com/facebook/rocksdb/pull/2052

Differential Revision: D4807355

Pulled By: siying

fbshipit-source-id: ef03786

Summary:
introduce new methods into a public threadpool interface,
- allow submission of std::functions as they allow greater flexibility.
- add Joining methods to the implementation to join scheduled and submitted jobs with
  an option to cancel jobs that did not start executing.
- Remove ugly `#ifdefs` between pthread and std implementation, make it uniform.
- introduce pimpl for a drop in replacement of the implementation
- Introduce rocksdb::port::Thread typedef which is a replacement for std::thread.  On Posix Thread defaults as before std::thread.
- Implement WindowsThread that allocates memory in a more controllable manner than windows std::thread with a replaceable implementation.
- should be no functionality changes.
Closes https://github.com/facebook/rocksdb/pull/1823

Differential Revision: D4492902

Pulled By: siying

fbshipit-source-id: c74cb11

Summary: Windows follow up for  https://github.com/facebook/rocksdb/commit/dc2584eea0d9965f97d38d4d462a7b57750144d3

Differential Revision: D4420337

Pulled By: IslamAbdelRahman

fbshipit-source-id: fedc5b5

Summary:
Enable directIO on WritableFileImpl::Append
     with offset being current length of the file.
     Enable UniqueID tests on Windows, disable others but
     leeting them to compile. Unique tests are valuable to
     detect failures on different filesystems and upcoming
     ReFS.
     Clear output in WinEnv Getchildren.This is different from
     previous strategy, do not touch output on failure.
     Make sure DBTest.OpenWhenOpen works with windows error message
Closes https://github.com/facebook/rocksdb/pull/1746

Differential Revision: D4385681

Pulled By: IslamAbdelRahman

fbshipit-source-id: c07b702

Summary:
rocksdb direct io support

```
[gzh@dev11575.prn2 ~/rocksdb] ./db_bench -benchmarks=fillseq --num=1000000
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
RocksDB:    version 5.0
Date:       Wed Nov 23 13:17:43 2016
CPU:        40 * Intel(R) Xeon(R) CPU E5-2660 v2 @ 2.20GHz
CPUCache:   25600 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Write rate: 0 bytes/second
Compression: Snappy
Memtablerep: skip_list
Perf Level: 1
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
DB path: [/tmp/rocksdbtest-112628/dbbench]
fillseq      :       4.393 micros/op 227639 ops/sec;   25.2 MB/s

[gzh@dev11575.prn2 ~/roc
Closes https://github.com/facebook/rocksdb/pull/1564

Differential Revision: D4241093

Pulled By: lightmark

fbshipit-source-id: 98c29e3

Summary:
It'd be nice to use the error status type to distinguish
between user error and system error. For example, GetChildren can fail
listing a backup directory's contents either because a bad path was provided
(user error) or because an operation failed, e.g., a remote storage service
call failed (system error). In the former case, we want to continue and treat
the backup directory as empty; in the latter case, we want to immediately
propagate the error to the caller.

This diff uses NotFound to indicate user error and IOError to indicate
system error. Previously IOError indicated both.
Closes https://github.com/facebook/rocksdb/pull/1644

Differential Revision: D4312157

Pulled By: ajkr

fbshipit-source-id: 51b4f24

For ease of reuse and customization as a library
  without wrapping.
  WinEnvThreads is a class for replacement.
  WintEnvIO is a class for reuse and behavior override.
  Added private virtual functions for custom override
  of fallocate pread for io classes.

Implement GetUniqueIdFromFile to support new tests and the feature.

Conditionally retrofit thread_posix for use with std::thread
  and reuse the same logic. Posix users continue using Posix interfaces.
  Enable XPRESS compression in test runs.
  Fix master introduced signed/unsigned mismatch.

make preallocation inline with other writable files
  make sure that we map no more than pre-allocated size.

This reverts commit b54c3474.

Revert async file handle change as it causes failures with appveyor

fix typos and remove duplicated words

  by using default implementation for now as it works.

Summary: I broke it in D53781.

Test Plan: tried the same code in util/env_posix.cc and it compiled successfully

Reviewers: sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D54303

Summary:
Added this new function, which returns filename, size, and modified
timestamp for each file in the provided directory. The default implementation
retrieves the metadata sequentially using existing functions. In the next diff
I'll make HdfsEnv override this function to use libhdfs's bulk get function.

This won't work on windows due to the path separator.

Test Plan:
new unit test

  $ ./env_test --gtest_filter=EnvPosixTest.ConsistentChildrenMetadata

Reviewers: yhchiang, sdong

Reviewed By: sdong

Subscribers: IslamAbdelRahman, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D53781

break compatibility with Windows 7. The issue with rotated logs
was fixed other way.