[JNI] Add java api and java tests for WriteBatch and WriteOptions, add put() and remove() to RocksDB.

Summary:
* Add java api for rocksdb::WriteBatch and rocksdb::WriteOptions, which are necessary components
  for running benchmark.
* Add java test for org.rocksdb.WriteBatch and org.rocksdb.WriteOptions.
* Add remove() to org.rocksdb.RocksDB, and add put() and remove() to RocksDB which take
  org.rocksdb.WriteOptions.

Test Plan: make jtest

Reviewers: haobo, sdong, dhruba

Reviewed By: sdong

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17373
[RocksDB] Fix a race condition in GetSortedWalFiles

Summary: This patch fixed a race condition where a log file is moved to archived dir in the middle of GetSortedWalFiles. Without the fix, the log file would be missed in the result, which leads to transaction log iterator gap. A test utility SyncPoint is added to help reproducing the race condition.

Test Plan: TransactionLogIteratorRace; make check

Reviewers: dhruba, ljin

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17121
[JNI] Improve the internal interface between java and c++ for basic db operations.

Summary:
Improve the internal interface between java and c++ for basic db operations
by including the RocksDB native handle (i.e., c++ pointer of rocksdb::DB)
as a input parameter of the internal interface.

This improvement reduces one JNI call per db operation from c++.

Test Plan: make test

Reviewers: haobo, sdong, dhruba

Reviewed By: sdong

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17445
[JNI] Avoid a potential byte-array-copy btw c++ and java in RocksDB.get(byte[], byte[]).

Summary: Avoid a JNI call to GetByteArrayElements, which may introduce a byte-array-copy.

Test Plan: make jtest

Reviewers: haobo, sdong, dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17451
[C-API] added "rocksdb_options_set_plain_table_factory" to make it possible to use plain table factory
[C-API] implemented more options
Merge pull request #108 from tecbot/c-api-enhancements

C-API enhancements
Add script auto_sanity_test.sh to perform auto sanity test

Summary:
Add script auto_sanity_test.sh to perform auto sanity test

usage: auto_sanity_test.sh [new_commit] [old_commit]

Running without commit parameter will do the sanity test with the latest
and the latest 10 commit.

Test Plan: ./auto_sanity_test.sh

Reviewers: haobo, igor

Reviewed By: igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17397
Move several more logging inside DB mutex to log buffer

Summary: Move several some common logging still in DB mutex to log buffer.

Test Plan: make all check

Reviewers: haobo, igor, ljin, nkg-

Reviewed By: nkg-

CC: nkg-, yhchiang, leveldb

Differential Revision: https://reviews.facebook.net/D17439
Merge branch 'master' of github.com:facebook/rocksdb into ignore
initialize candidate count
[RocksDB] make SetPerfLevel affect only the current thread

Summary: as title, make it easy to turn on/off profiling at per thread level.

Test Plan: make check

Reviewers: sdong, ljin

Reviewed By: ljin

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17469
Fix MacOS errors
Merge branch 'master' into jni
Fix some other signed & unsigned comparisons

Summary: Fix some signed and unsigned comparisons to make some other build script happy.

Test Plan: Build and run those changed tests

Reviewers: ljin, igor, haobo

Reviewed By: igor

CC: yhchiang, dhruba, kailiu, leveldb

Differential Revision: https://reviews.facebook.net/D17463
Flush Buffered Info Logs Before Doing Compaction (one line change)

Summary: Flushing log buffer earlier to avoid confusion of time holding the locks.

Test Plan: Should be safe as long as several related db test passes

Reviewers: haobo, igor, ljin

Reviewed By: igor

CC: nkg-, leveldb

Differential Revision: https://reviews.facebook.net/D17493
Merge branch 'jni'
Make RocksDB compile for iOS

Summary:
I had to make number of changes to the code and Makefile:
* Add `make lib`, that will create static library without debug info. We need this to avoid growing binary too much. Currently it's 14MB.
* Remove cpuinfo() function and use __SSE4_2__ macro. We actually used the macro as part of Fast_CRC32() function.
As a result, I also accidentally fixed this issue: https://www.facebook.com/groups/rocksdb.dev/permalink/549700778461774/?stream_ref=2
* Remove __thread locals in OS_MACOSX

Test Plan: `make lib PLATFORM=IOS`

Reviewers: ljin, haobo, dhruba, sdong

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17475
Dynamically choose SSE 4.2

Summary: Otherwise, if we compile on machine with SSE4.2 support and run it on machine without the support, we will fail.

Test Plan: compiles, verified that isSse42() gets called.

Reviewers: dhruba

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17505
make hash_link_list Node's key space consecutively followed at the end

Summary: per sdong's request, this will help processor prefetch on n->key case.

Test Plan: make all check

Reviewers: sdong, haobo, igor

Reviewed By: sdong

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17415