Signed-off-by: qupeng <qupeng@pingcap.com>

Since both tikv-3.0 and tikv-3.1 are using the same rocksdb, titan and rust-rocksdb branch, changing the branch name to tikv-3.x.

Also update rocksdb with the following change for 3.x branch:
```
b047a2a6d 2019-11-26 yiwu@pingcap.com     Fix DBFlushTest::FireOnFlushCompletedAfterCommittedResult hang (#6018)
7f1d9f2c8 2019-11-26 harrywong@live.com   Removed const fields in copyable classes (#5095)
59f71ee61 2019-11-26 siying.d@fb.com      Rename InternalDBStatsType enum names (#5779)
1ee718b3b 2019-11-26 xy.tao@outlook.com   Fix blob context when db_iter uses seek (#6051)
129ad9c95 2019-11-26 bupt2013211450@gma.. fix unstable unittest caused by #5958 (#6061)
88cd73817 2019-11-26 bupt2013211450@gma.. Fix corruption with intra-L0 on ingested files (#5958)
4d6616422 2019-11-26 thomasf@fb.com       Restrict L0->L0 compaction according to max_compaction_bytes option (#5329)
b829446c8 2019-11-26 yiwu@pingcap.com     Revert "Disable Intra-L0 compaction (#128)"
ae2c5a217 2019-11-26 bupt2013211450@gma.. Fix IngestExternalFile's bug with two_write_queue (#5976)
8664450cf 2019-11-26 anand76@devvm1373... Update bg_error when log flush fails in SwitchMemtable() (#5072)
```
Signed-off-by: Yi Wu <yiwu@pingcap.com>

* fix titan cf options for create_cf
Signed-off-by: Connor1996 <zbk602423539@gmail.com>

Cherry-pick change to disable intra-L0 compaction, to temporarily avoid a data corruption case.
```
d21d976a1 2019-10-23 yiwu@pingcap.com     Disable Intra-L0 compaction (#128)
```
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Cherry-pick #347 for TiKV v3.1.

Cherry-picking the following rocksdb and titan fixes to tikv-3.0 branch.
rocksdb:
```
7e4e054ae 2019-10-15 yiwu@pingcap.com     Make WaitForFlushMemTable public (#125)
89ff3e3b8 2019-09-29 yiwu@pingcap.com     Lower the risk for users to run options.force_consistency_checks = true (#5744) (#120)
9c5b744ee 2019-09-26 nrc@ncameron.org     Relax warnings as errors so we can build on Clang 11 (#123)
179a8f5e0 2019-09-20 yiwu@pingcap.com     fast look up purge_queue (#5796) (#119)
```
titan:
```
43225d4 2019-10-16 yiwu@pingcap.com     Fix Titan missing blob issue (#97)
```
Signed-off-by: Yi Wu <yiwu@pingcap.com>

The option is useful for catching LSM tree corruption. Adding it.
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Add OnBackgroundError handler API.

For the API, also adding crocksdb_status_ptr_t struct, which may be later extend to allow setting a different status (since rocksdb OnBackgroundError allow overriding the background error).
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Cherry-pick recent Titan changes included in https://github.com/pingcap/titan/pull/89Signed-off-by: Yi Wu <yiwu@pingcap.com>

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>

Update `ColumnFamilyOptions` to support `DoublySkipList` in memtable.

* Update titan branch to tikv-3.0 specific branch
Signed-off-by: Yi Wu <yiwu@pingcap.com>

* Adding jemalloc-nodump-allocator option for lru-cache (#328)

Adding LRUCacheOptions::set_no_dump_allocator, so we can use JemallocNoDumpAllocator of rocksdb to exclude some LRU Cache, like block cache, from core dump.

* add delete files in ranges API for titan
Signed-off-by: Connor1996 <zbk602423539@gmail.com>

Cherry-picking the following changes that fixes zlib, jemalloc and gflags dependencies, and fixes a flaky test:
```
6ead62ca 2019-07-25 yiwu@pingcap.com     Avoid build require system zlib (#303)
9246b9c5 2019-07-25 hi@breeswish.org     Skip jemalloc options on specific platform (#324)
7a8dd731 2019-07-22 yiwu@pingcap.com     Add jemalloc-sys dependency when jemalloc is enabled (#320)
6f2c6320 2019-07-23 yiwu@pingcap.com     Not compile with gflags (#322)
09b80321 2019-07-22 yiwu@pingcap.com     Fix perf context test (#321)
d67f38e2 2019-07-21 yiwu@pingcap.com     Add jemalloc feature (#319)
```

Also update rocksdb to fix compile error with gcc9:
```
7a03c83ed 2019-07-23 psergey@askmonty.org Fix MyRocks compile warnings-treated-as-errors on Fedora 30, gcc 9.1.1 (#5553)
```

Cherry-picking #315 to tikv-3.0 branch.

Signed-off-by: Yi Wu yiwu@pingcap.com

Cherry-picking changes:
c503e736 2019-07-02 yiwu@pingcap.com     Fix Titan portable build (#312)
c17648a5 2019-07-01 yiwu@pingcap.com     Fix create_cf not passinig titan specific options to titan (#311)

* Fix titan config (#306)

* Add titan read option (#309)
Signed-off-by: Connor1996 <zbk602423539@gmail.com>

Signed-off-by: Yi Wu <yiwu@pingcap.com>

Signed-off-by: siddontang <siddontang@gmail.com>

* add recycle log configuration
Signed-off-by: siddontang <siddontang@gmail.com>

* add titan blob-run-mode

* checkout latest bug fix and titan stats

* move Titan to separate repository
Signed-off-by: Yi Wu <yiwu@pingcap.com>

This is to get around borrow checker for TiKV side of changes. Other APIs also pass in structs as reference.

Adding BlockBasedTableOptions::set_block_cache so we can set shared block cache instance to different column family and different DB instance.

Also adding LRUCacheOptions and Cache structs.

Update RocksDB to include the following changes:
018aa1972 Titan: fix error message formatting (#84)
ee2f17ca8 Fix crash with memtable prefix bloom and key out of prefix extractor domain (#5190)
16ace7c47 Titan: Add snapshot related test (#80)
ee8b59301 Titan: Fix iterator fail to pass SuperVersion to underlying iterator (#79)

Signed-off-by: Yi Wu yiwu@pingcap.com

Signed-off-by: Connor1996 <zbk602423539@gmail.com>

Update .gitmodules to point to pingcap/rocksdb tikv-3.0 branch. Also update rocksdb to include the following changes:

75133b1b6 2019-03-26 yiwu@pingcap.com Fix SstFileReader not able to open ingested file (#5097)
7ca9eb754 2019-03-26 yiwu@pingcap.com Fix BlockBasedTableIterator construction missing index_key_is_full parameter
Signed-off-by: Yi Wu <yiwu@pingcap.com>

We should not rely on a specific version of rust.