Summary:
Refactor WriteImpl() so when I plug-in the pipeline write code (which is
an alternative approach for WriteThread), some of the logic can be
reuse. I split out the following methods from WriteImpl():

* PreprocessWrite()
* HandleWALFull() (previous MaybeFlushColumnFamilies())
* HandleWriteBufferFull()
* WriteToWAL()

Also adding a constructor to WriteThread::Writer, and move WriteContext into db_impl.h.
No real logic change in this patch.
Closes https://github.com/facebook/rocksdb/pull/2042

Differential Revision: D4781014

Pulled By: yiwu-arbug

fbshipit-source-id: d45ca18

Summary:
It is confusing to have auto_roll_logger to stay under db/, which has nothing to do with database. Move filename together as it is a dependency.
Closes https://github.com/facebook/rocksdb/pull/2080

Differential Revision: D4821141

Pulled By: siying

fbshipit-source-id: ca7d768

Summary: Closes https://github.com/facebook/rocksdb/pull/2037

Differential Revision: D4822085

Pulled By: maysamyabandeh

fbshipit-source-id: 9d5a986

Summary:
add \' pair to avoid bash expanding before run remotely
Closes https://github.com/facebook/rocksdb/pull/2079

Differential Revision: D4821342

Pulled By: lightmark

fbshipit-source-id: 418ba41

Summary:
Following the instructions on INSTALL.md,
I found some errors while installing gflags and zstandard libraries on Centos and fixed them.
Thanks :)
Closes https://github.com/facebook/rocksdb/pull/2077

Differential Revision: D4820804

Pulled By: ajkr

fbshipit-source-id: db4abb3

Summary:
auto_roll_logger_test relies on timing conditon that some operations finish within 1 seconds. This caused flaky tests. Move away from real timing and sleep and use fake time to verify the time-based rolling.
Closes https://github.com/facebook/rocksdb/pull/2066

Differential Revision: D4810647

Pulled By: siying

fbshipit-source-id: c54d994

Summary:
`uint` is nonstandard and not a built-in type on all compilers; replace it
with the always-valid `unsigned int`. I assume this went unnoticed because
it's inside an `#ifdef ROCKDB_JEMALLOC`.
Closes https://github.com/facebook/rocksdb/pull/2075

Differential Revision: D4820427

Pulled By: ajkr

fbshipit-source-id: 0876561

Summary:
Previously it always showed 0.0 for L0 write-amp because we were dividing by bytes read from non-output level. For L0, we should instead divide by bytes ingested to the DB. Note the numerator (bytes written to L0) includes flush bytes.
Closes https://github.com/facebook/rocksdb/pull/2078

Differential Revision: D4816902

Pulled By: ajkr

fbshipit-source-id: 7dca31a

Summary:
yuslepukhin

See individual commits.
Closes https://github.com/facebook/rocksdb/pull/2051

Differential Revision: D4819697

Pulled By: siying

fbshipit-source-id: 75c1de4

Summary:
avoid exit when $? != 0
Closes https://github.com/facebook/rocksdb/pull/2076

Differential Revision: D4815655

Pulled By: lightmark

fbshipit-source-id: 829299e

Summary:
Fix the bug that previous test existence locally
Closes https://github.com/facebook/rocksdb/pull/2074

Differential Revision: D4813631

Pulled By: lightmark

fbshipit-source-id: eceb0d9

Summary:
force remove db dir when rebuilding
Closes https://github.com/facebook/rocksdb/pull/2067

Differential Revision: D4811926

Pulled By: lightmark

fbshipit-source-id: ab068a2

Summary:
Closes https://github.com/facebook/rocksdb/issues/2068
Closes https://github.com/facebook/rocksdb/pull/2072

Differential Revision: D4810855

Pulled By: ajkr

fbshipit-source-id: 288ddb9

Summary:
some fbcode services override it, we need to keep it virtual.

original change: #1756
Closes https://github.com/facebook/rocksdb/pull/2065

Differential Revision: D4808123

Pulled By: ajkr

fbshipit-source-id: 5eaeea7

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:
temporarily disable since it isn't working on travis.
Closes https://github.com/facebook/rocksdb/pull/2064

Differential Revision: D4807373

Pulled By: ajkr

fbshipit-source-id: f2bb2b0

Summary:
previously we only cleaned up .tmp files under "shared/" and "private/" directories in case the previous backup failed. we need to do the same for "shared_checksum/"; otherwise, the subsequent backup will fail if it tries to backup at least one of the same files.
Closes https://github.com/facebook/rocksdb/pull/2062

Differential Revision: D4805599

Pulled By: ajkr

fbshipit-source-id: eaa6088

Summary: Closes https://github.com/facebook/rocksdb/pull/2063

Differential Revision: D4805507

Pulled By: lightmark

fbshipit-source-id: 59ccb18

Summary:
This adds almost all missing options to RocksJava
Closes https://github.com/facebook/rocksdb/pull/2039

Differential Revision: D4779991

Pulled By: siying

fbshipit-source-id: 4a1bf28

Summary:
Operations like Seek/Next/Prev sometimes take too long to complete when there are many internal keys to be skipped. Adding an option, max_skippable_internal_keys -- which could be used to set a threshold for the maximum number of keys that can be skipped, will help to address these cases where it is much better to fail a request (as incomplete) than to wait for a considerable time for the request to complete.

This feature -- to fail an iterator seek request as incomplete, is disabled by default when max_skippable_internal_keys = 0. It is enabled only when max_skippable_internal_keys > 0.

This feature is based on the discussion mentioned in the PR https://github.com/facebook/rocksdb/pull/1084.
Closes https://github.com/facebook/rocksdb/pull/2000

Differential Revision: D4753223

Pulled By: sagar0

fbshipit-source-id: 1c973f7

Summary:
instead of thread_local

The cleanup path for the rocksdb database might not have the
thread_updater_local_cache_ pointer initialized because the thread
executing the cleanup is likely not a rocksdb thread. This results in a
memory leak detected by Valgrind. The cleanup code path should use the
thread_status_updater pointer obtained from the DB object instead of a
thread local one.
Closes https://github.com/facebook/rocksdb/pull/2059

Differential Revision: D4801611

Pulled By: hermanlee

fbshipit-source-id: 407d7de

Summary:
add ldb to regression test in order to enable reuse db by creating checkpoint
Closes https://github.com/facebook/rocksdb/pull/2030

Differential Revision: D4800549

Pulled By: lightmark

fbshipit-source-id: d3a7325

Summary:
Currently the fast crc32 path is not enabled on Windows. I am trying to enable it here, hopefully, with the minimum impact to the existing code structure.
Closes https://github.com/facebook/rocksdb/pull/2033

Differential Revision: D4770635

Pulled By: siying

fbshipit-source-id: 676f8b8

Summary:
Adding API missing after https://github.com/facebook/rocksdb/commit/1ffbdfd9a7637b6517053842386d71df2cd00d9b#diff-b94146418eed4a9c1bf324041b95b279.

adamretter  IslamAbdelRahman

Tested locally.
Closes https://github.com/facebook/rocksdb/pull/2028

Differential Revision: D4762817

Pulled By: IslamAbdelRahman

fbshipit-source-id: 833f478

Summary:
Changed the naming of backup engine threads from "ldb" to "backup_engine"
Closes https://github.com/facebook/rocksdb/pull/2053

Differential Revision: D4799325

Pulled By: ajkr

fbshipit-source-id: 046893f

Summary:
Add two DB properties: rocksdb.actual_delayed_write_rate and rocksdb.is_write_stooped, for people to know whether current writes are being throttled.
Closes https://github.com/facebook/rocksdb/pull/2043

Differential Revision: D4782975

Pulled By: siying

fbshipit-source-id: 6b2f5cf

Summary:
As discuss in this thread:
https://www.facebook.com/groups/rocksdb.dev/permalink/1218043868294125/

We remove fallocate with FALLOC_FL_PUNCH_HOLE because the recent bug on xfs in kernel 4.x+ that align file size to page size even with FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE.
Closes https://github.com/facebook/rocksdb/pull/2038

Differential Revision: D4779974

Pulled By: siying

fbshipit-source-id: 5f54625

Summary:
...to fix lite build error.
Closes https://github.com/facebook/rocksdb/pull/2046

Differential Revision: D4785910

Pulled By: yiwu-arbug

fbshipit-source-id: b591f27

Summary:
Allow the users to specify the target index partition size.

With this patch an index partition is cut before its estimated in-memory size goes above the configured value for metadata_block_size. The filter partitions are still cut right after an index partition is cut.
Closes https://github.com/facebook/rocksdb/pull/2041

Differential Revision: D4780216

Pulled By: maysamyabandeh

fbshipit-source-id: 95a0831

Summary:
Right now, building rocksdbjava in PowerPC is broken due to JNI library name. I figured it out that "uname -m" and java's os.arch matches in PowerPC architecture. I made use of this advantage to fix the issue. More info can found from this issue  --> https://github.com/facebook/rocksdb/issues/1317
Closes https://github.com/facebook/rocksdb/pull/2040

Differential Revision: D4779967

Pulled By: siying

fbshipit-source-id: 259f939

Summary:
Fixes #1961 which causes a segfault when filter_policy is nullptr and both
pin_l0_filter_and_index_blocks_in_cache/cache_index_and_filter_blocks
are set.
Closes https://github.com/facebook/rocksdb/pull/2029

Differential Revision: D4764862

Pulled By: maysamyabandeh

fbshipit-source-id: 05bd695

Summary:
Added fifo benchmark to db_bench.
One thing i am not sure is that i am using CompactRange() instead of CompactFiles(). (may cause performance skew because CompactionRange() is not happening in current thread?)  For CompactFiles(), for some reason FIFO compaction doesn't work as expected. More insight is welcomed. I guess FIFO compaction doesn't work with file names? igorcanadi

test cmd:
./db_bench --compaction_style=2 --benchmarks=fillseqdeterministic --disable_auto_compactions --num_levels=1 --fifo_compaction_max_table_files_size_mb=10

---------------------- DB 0 LSM ---------------------
Level[0]: /000014.sst(size: 4211014 bytes)
fillseqdeterministic :       4.731 micros/op 211381 ops/sec;   23.4 MB/s
Closes https://github.com/facebook/rocksdb/pull/1734

Differential Revision: D4774964

Pulled By: siying

fbshipit-source-id: 9d08df6

Summary:
need to consistently include "rocksdb/persistent_cache.h" to fix internal build
Closes https://github.com/facebook/rocksdb/pull/2034

Differential Revision: D4768101

Pulled By: ajkr

fbshipit-source-id: 2ecb07f

Summary: Closes https://github.com/facebook/rocksdb/pull/2032

Differential Revision: D4766260

Pulled By: siying

fbshipit-source-id: 415daa4

Summary:
I've added functions to the C API to support WriteBatchWithIndex as requested in #1833.

I've also added unit tests to c_test

I've implemented the WriteBatchWithIndex variation of every function available for regular WriteBatch.  And added additional functions unique to WriteBatchWithIndex.

For now, the following is omitted:
  1. The ability to create WriteBatchWithIndex's custom batch-only iterator as I'm not sure what its purpose is.  It should be possible to add later if anyone wants it.
  2. The ability to create the batch with a fallback comparator, since it appears to be unnecessary.  I believe the column family comparator will be used for this, meaning those using a custom comparator can just use the column family variations.
Closes https://github.com/facebook/rocksdb/pull/1985

Differential Revision: D4760039

Pulled By: siying

fbshipit-source-id: 393227e

Summary:
Since non_shn CI was made to run in parallel, /dev/shm is automatically used. It defeated the purpose of the test to cover a non-ramfs file system.
Closes https://github.com/facebook/rocksdb/pull/2031

Differential Revision: D4764804

Pulled By: siying

fbshipit-source-id: 5666bda

Summary:
options_file_example should be added in .gitignore so that it does not show up as an untracked file in `git status`.
Closes https://github.com/facebook/rocksdb/pull/2026

Differential Revision: D4759402

Pulled By: sagar0

fbshipit-source-id: d7fe133

Summary:
PR to fix this issue -> https://github.com/facebook/rocksdb/issues/1926
Closes https://github.com/facebook/rocksdb/pull/1965

Differential Revision: D4682411

Pulled By: siying

fbshipit-source-id: a519be1

Summary:
Errors where:

db/version_set.cc:1535:20: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]
                  [this](const Fsize& f1, const Fsize& f2) -> bool {
                   ^
db/version_set.cc:1541:20: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]
                  [this](const Fsize& f1, const Fsize& f2) -> bool {
                   ^
db/db_test.cc:2983:27: error: lambda capture 'kNumPutsBeforeWaitForFlush' is not required to be captured for this use [-Werror,-Wunused-lambda-capture]
  auto gen_l0_kb = [this, kNumPutsBeforeWaitForFlush](int size) {
                          ^
Closes https://github.com/facebook/rocksdb/pull/1972

Differential Revision: D4685991

Pulled By: siying

fbshipit-source-id: 9125379

Summary: Closes https://github.com/facebook/rocksdb/pull/2025

Differential Revision: D4759957

Pulled By: siying

fbshipit-source-id: 5b5b625