Summary:
Within this commit a new AbstractLogger was introduced
which allows to handle log messages at an application level.
Log messages are passed up to Java using a JNI callback.
This allows a Java-Developer to use common Java APIs for log
messages e.g. SLF4J, LOG4J, etc. Within this commit no new
dependencies were introduced, which keeps the RocksDB API clean
and doesn`t force a developer to use a predefined high-level Java API.
Another feature is to dynamically set a custom loggers verbosity at
runtime using its public method `setInfoLogLevel` and to retrieve
the currently active level using the `infoLogLevel` method.
Test Plan:
make clean jclean rocksdbjava jtest
mvn -f rocksjni.pom package
Reviewers: adamretter, ankgup87, yhchiang
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D34755
Summary:
Bytes are currently misinterpreted by the Java if the
byte array contains zero bytes within its content. For Strings
thats usually not useful. As the Java API allows every kind
of byte array values it might be the case that zero padding might
happen.
Test Plan:
make rocksdbjava
make jtest
Reviewers: adamretter, yhchiang, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D33165
Summary:
As the C++ part exposes now SequenceNumber retrieval
for Snapshots we want this obviously also in the Java API.
Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom test
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D32571
Summary:
This differential describes further changes to the Java-API
New methods:
* GetUpdatesSince
* GetLatestSequenceNumber
* EnableFileDeletions
* DisableFileDeletions
This pull requests depends on: https://github.com/facebook/rocksdb/pull/472
Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom package
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D32151
Simple Java Native Objects usually are represented using
the same functionality but within different classes.
With this commit a template class was introduced to remove
the redundant impelementation to a certain extent.
The methods:
- newIterator
- iterators
support now also ReadOptions. That allows a user of the Java API
to retrieve RocksIterator instances on a snapshot.
Summary:
Previous to this commit there was a problem with unterminated
String usage as jByteArrays are not zero terminated.
Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom package
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D31809
Summary:
TTLDB Support exposed in Java-API. It is now
possible to open a datbase using the RocksDB time
to live feature.
Test Plan:
make rocksdbjava
make test
mvn -f rocksjni.pom package
@Adam please test mac osx compile
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba, adam
Differential Revision: https://reviews.facebook.net/D31449
Summary:
Previous to this commit ColumnFamilyDescriptor took a String as name for the ColumnFamily name. String is however encoding dependent which is bad because listColumnFamilies returns byte arrays without any encoding information.
All public API call were deprecated and flagged to be removed in 3.10.0
Test Plan:
make rocksdbjava
make test
mvn -f rocksjni.pom package
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D30525
Summary:
Add support to allow nested config for block-based table factory. The format looks like this:
"write_buffer_size=1024;block_based_table_factory={block_size=4k};max_write_buffer_num=2"
Test Plan: unit test
Reviewers: yhchiang, rven, igor, ljin, jonahcohen
Reviewed By: jonahcohen
Subscribers: jonahcohen, dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D29223
Summary:
- AssertionError when initialized with Non-Direct Buffer
- Tests + coverage for DirectSlice
- Slice sigsegv fixes when initializing from String and byte arrays
- Slice Tests
Test Plan: Run tests without source modifications.
Reviewers: yhchiang, adamretter, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D30081
Summary: Manual range compaction support in RocksJava.
Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom package
Reviewers: adamretter, yhchiang, ankgup87
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D29283
Summary:
RocksDB supports two ways of saving snapshots. In
memory and on disk. The later was added with this
pull request to RocksJava.
Test Plan:
Reviewers:
Subscribers:
RocksDB introduced in 3.7.0 convenience methods
for getting ColumnFamilyOptions and DBOptions
instances from predefined configuration structures.
There is now also a method in RocksJava to load DBOptions
as well as ColumnFamilyOptions from a predefined Properties
based configuration.
Summary:
The very last reference happens in DBImpl::GetOptions()
I built with both DBImpl::GetOptions() and ColumnFamilyData::options() commented out
Test Plan: make all check
Reviewers: sdong, yhchiang, igor
Reviewed By: igor
Subscribers: dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D29073
Expose GetIntProperty methods to RocksJava. As the integer(64-Bit)
value is no integer in Java the method is aligned with the return
type which is long.
Summary: So iOS size_t is 32-bit, so we need to static_cast<size_t> any uint64_t :(
Test Plan: TARGET_OS=IOS make static_lib
Reviewers: dhruba, ljin, yhchiang, rven, sdong
Reviewed By: sdong
Subscribers: dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D28743
Summary:
We need to turn on -Wshorten-64-to-32 for mobile. See D1671432 (internal phabricator) for details.
This diff turns on the warning flag and fixes all the errors. There were also some interesting errors that I might call bugs, especially in plain table. Going forward, I think it makes sense to have this flag turned on and be very very careful when converting 64-bit to 32-bit variables.
Test Plan: compiles
Reviewers: ljin, rven, yhchiang, sdong
Reviewed By: yhchiang
Subscribers: bobbaldwin, dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D28689
Summary:
ColumnFamilyHandles face the same problem as RocksIterator previously
so used methods were also applied for ColumnFamilyHandles.
Another problem with CF was that Options passed to CFs were
always filled with default values. To enable Merge, all parts
of the database must share the same merge functionality which
is not possible using default values. So from now on every
CF will inherit from db options.
Changes to RocksDB:
- merge can now take also a cfhandle
Changes to MergeTest:
- Corrected formatting
- Included also GC tests
- Extended tests to cover CF related parts
- Corrected paths to cleanup properly within the test process
- Reduced verbosity of the test
Test Plan:
make rocksdbjava
make jtest
Subscribers: dhruba
Differential Revision: https://reviews.facebook.net/D27999
Summary:
Options extends now two interfaces DBOptionsInterface
and ColumnFamilyOptionsInterface. There are also further
improvements to the Options bindings:
Optimize methods were ported to Java. (OptimizeForPointLookup,
OptimizeLevelCompaction, OptimizeUniversalCompaction).
To align BuiltinComparator with every other Enum it was moved to
a separate file.
Test Plan:
make rocksdbjava
make jtest
Summary:
- BackupableDB deleteBackup method
- BackupableDB purgeOldBackups bugfix
- BackupInfos now available in Restorable-/BackupableDB
- Extended BackupableDBTest to cover more of the currently implemented functionality.
Test Plan:
make rocksdbjava
make jtest
Differential Revision: https://reviews.facebook.net/D27027
Summary:
Snapshots integration into RocksJava. Added support for the following functionalities:
- getSnapshot
- releaseSnapshot
- ReadOptions support to set a Snapshot
- ReadOptions support to retrieve Snapshot
- SnapshotTest
Test Plan:
make rocksdbjava
make jtest
Differential Revision: https://reviews.facebook.net/D24801
Previous to this commit Filters passed as parameters to the
BlockTableConfig are disposed before they should be disposed.
Further Smart pointer usage was corrected.
Java holds now the smart pointer to the FilterPolicy correctly
and cares about freeing underlying c++ structures.
Summary:
Added support for the merge operation to RocksJava.
You can specify a merge function to be used on the current database.
The merge function can either be one of the functions defined in
utilities/merge_operators.h, which can be specified through its
corresponding name, or a user-created function that needs to be
encapsulated in a JNI object in order to be used. Examples are
provided for both use cases.
Test Plan: There are unit test in MergeTest.java
Reviewers: ankgup87
Subscribers: vladb38
Differential Revision: https://reviews.facebook.net/D24525
This commit includes the support for the following functionalities:
- Single Get/Put operations
- WriteBatch operations
- Single iterator functionality
- Open database with column families
- Open database with column families Read/Only
- Create column family
- Drop column family
- Properties of column families
- Listing of column families
- Fully backwards comptabile implementation
- Multi Iterator support
- MultiGet
- KeyMayExist
- Option to create missing column families on open
In addition there is are two new Tests:
- Test of ColumnFamily functionality
- Test of Read only feature to open subsets of column families
- Basic test to test the KeyMayExist feature
What is not supported currently using RocksJava:
- Custom ColumnFamilyOptions
The following targets work as expected:
- make rocksdbjava
- make jtest
Test environment: Ubuntu 14.04(LTS, x64), Java 1.7.0_65(OpenJDK IcedTea 2.5.2), g++ 4.8.2, kernel 3.13.0-35-generix
Summary:
This pull request solves the jlong overflow problem on 32-Bit machines as described in https://github.com/facebook/rocksdb/issues/278:
1. There is a new org.rocksdb.test.PlatformRandomHelper to assist in getting random values. For 32 Bit the getLong method is overriden by xpromaches code above. For 64 Bit it behaves as is.
2. The detection should be cross-platform (Windows is supported though it is not ported completely yet).
3. Every JNI method which sets jlong values must check if the value fits into size_t. If it overflows size_t a InvalidArgument Status object will be returned. If its ok a OK Status will be returned.
4. Setters which have this check will throw a RocksDBException if its no OK Status.
Additionally some other parts of code were corrected using the wrong type casts.
Test Plan:
make rocksdbjava
make jtest
Differential Revision: https://reviews.facebook.net/D24531
Extended Built-in comparators with ReverseBytewiseComparator.
Reverse key handling is under certain conditions essential. E.g. while
using timestamp versioned data.
As native-comparators were not available using JAVA-API. Both built-in comparators
were exposed via JNI to be set upon database creation time.
Summary:
Fixed 32-bit overflowing issue when converting jlong to size_t by
capping jlong to std::numeric_limits<size_t>::max().
Test Plan:
make rocksdbjava
make jtest
Reviewers: ankgup87, ljin, sdong, igor
Reviewed By: igor
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D23511
Summary: as title
Test Plan: make rocksdbjava
Reviewers: sdong, yhchiang, igor
Reviewed By: igor
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D23193
Summary:
Simply code by removing code path which does not use Arena
from NewInternalIterator
Test Plan:
make all check
make valgrind_check
Reviewers: sdong
Reviewed By: sdong
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D22395
Summary: as title
Test Plan:
tested on my mac
make rocksdbjava
make jtest
Reviewers: sdong, igor, yhchiang
Reviewed By: yhchiang
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D21963
Summary:
I will move compression related options in a separate diff since this
diff is already pretty lengthy.
I guess I will also need to change JNI accordingly :(
Test Plan: make all check
Reviewers: yhchiang, igor, sdong
Reviewed By: igor
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D21915
Summary:
1. Check status of CreateNewBackup. If status is not OK, then throw.
2. Add purgeOldBackups API
Test Plan:
make test
make sample
Reviewers: haobo, sdong, zzbennett, swapnilghike, yhchiang
Reviewed By: yhchiang
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D21753
Summary:
Update header inclusion as include/utilities/*.h has been moved to
include/rocksdb/utilities/*.h
Test Plan: make rocksdbjava
Reviewers: ljin, sdong, igor
Reviewed By: igor
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D20517
Summary:
Add setCacheNumShardBits() and cacheNumShardBits() to Options. This allows
developers to control the number of shards for the block cache.
Test Plan:
make rocksdbjava
cd java
make db_bench
./jdb_bench.sh --cache_size=1048576 --cache_numshardbits=6
Reviewers: sdong, ljin, ankgup87
Reviewed By: ankgup87
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D19347
Summary: Fixed the Java compilation error caused by PlainTableFactory API change.
Test Plan:
make rocksdbjava
make jdb_bench
cd java;./jdb_bench.sh
Reviewers: sdong, ljin, ankgup87, swapnilghike, zzbennett, rsumbaly, igor
Reviewed By: igor
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D20295
Summary:
1. Move disOwnNativeHandle() function from RocksDB to RocksObject
to allow other RocksObject to use disOwnNativeHandle() when its
ownership of native handle has been transferred.
2. RocksObject now has an abstract implementation of dispose(),
which does the following two things. First, it checks whether
both isOwningNativeHandle() and isInitialized() return true.
If so, it will call the protected abstract function dispose0(),
which all the subclasses of RocksObject should implement. Second,
it sets nativeHandle_ = 0. This redesign ensure all subclasses
of RocksObject have the same dispose behavior.
3. All subclasses of RocksObject now should implement dispose0()
instead of dispose(), and dispose0() will be called only when
isInitialized() returns true.
Test Plan:
make rocksdbjava
make jtest
Reviewers: dhruba, sdong, ankgup87, rsumbaly, swapnilghike, zzbennett, haobo
Reviewed By: haobo
Subscribers: leveldb
Differential Revision: https://reviews.facebook.net/D18801
Summary:
Before the Java binding for Env is ready, Java developers have no way to
control the number of background threads. This diff provides a temporary
solution where RocksDB.setMaxBackgroundCompactions() will affect the
number of background threads.
Note that once Env is ready. Changes made in this diff should be reverted.
Test Plan:
make rocksdbjava
make jtest
make jdb_bench
java/jdb_bench.sh
Reviewers: haobo, sdong
Reviewed By: sdong
CC: leveldb
Differential Revision: https://reviews.facebook.net/D18681
Summary:
Add RocksObject, the base class of all java objects which has a c++ pointer.
While the finalizer of a RocksObject will release its c++ resource, it is
suggested to call its RocksObject.dispose() to manually release its
c++ resource.
Existing RocksDB java classes are now extending RocksObject.
Test Plan:
make rocksdbjava
make jtest
make jdb_bench
Reviewers: haobo, dhruba, sdong, ankgup87, rsumbaly, swapnilghike, zzbennett
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D18411
Summary:
* Add filluniquerandom
* Add readseq, implemented using iterator.
* Realize most command-line-arguments from db_bench.cc (70+).
* Some code are commented out as some of the options in Options
not yet have Java bindings.
* Add default option to DbBenchmark.
* RocksDB will now take the ownership of all c++ raw-pointers from Options, which includes a c++ raw-pointer for Filter.
Test Plan: ./jdb_bench.sh --db=/tmp/rocksjava-bench/db --num_levels=6 --key_size=20 --prefix_size=20 --keys_per_prefix=0 --value_size=100 --block_size=4096 --cache_size=17179869184 --cache_numshardbits=6 --compression_ratio=1 --min_level_to_compress=-1 --disable_seek_compaction=1 --hard_rate_limit=2 --write_buffer_size=134217728 --max_write_buffer_number=2 --level0_file_num_compaction_trigger=8 --target_file_size_base=134217728 --max_bytes_for_level_base=1073741824 --disable_wal=0 --wal_dir=/tmp/rocksjava-bench/wal --sync=0 --disable_data_sync=1 --verify_checksum=1 --delete_obsolete_files_period_micros=314572800 --max_grandparent_overlap_factor=10 --max_background_compactions=4 --max_background_flushes=0 --level0_slowdown_writes_trigger=16 --level0_stop_writes_trigger=24 --statistics=0 --stats_per_interval=0 --stats_interval=1048576 --histogram=0 --use_plain_table=1 --open_files=-1 --mmap_read=1 --mmap_write=0 --memtablerep=prefix_hash --bloom_bits=10 --bloom_locality=1 --perf_level=0 --benchmarks=filluniquerandom,readseq,readrandom --use_existing_db=0 --threads=4
Reviewers: haobo, dhruba, sdong, ankgup87, rsumbaly, swapnilghike, zzbennett
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D18267
Summary:
Add Java bindings and Java tests for 30+ rocksdb::Options. Codes are
machine-genearted based on include/rocksdb/options.h with manual-polishment.
Test Plan:
make rocksdbjava
make jtest
Reviewers: haobo, dhruba, sdong, ankgup87, rsumbaly, swapnilghike, zzbennett
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D18273
Summary: Add Java binding and test for rocksdb::ReadOptions.
Test Plan:
make rocksdbjava
make jtest
Reviewers: haobo, dhruba, sdong, ankgup87, rsumbaly, swapnilghike, zzbennett
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D18129
Summary:
Add Java bindings for memtables and sst format. Specifically,
add two abstract Java classses --- MemTableConfig and SstFormatConfig.
Each MemTable / SST implementation should has its own config class
extends MemTableConfig / SstFormatConfig respectively and pass it
to Options via setMemTableConfig / setSstConfig.
Test Plan:
make rocksdbjava
make jdb_test
make jdb_bench
java/jdb_bench.sh \
--benchmarks=fillseq,readrandom,readwhilewriting \
--memtablerep=hash_skiplist \
--use_plain_table=1 \
--key_size=20 \
--prefix_size=12 \
--value_size=100 \
--cache_size=17179869184 \
--disable_wal=0 \
--sync=0 \
Reviewers: haobo, ankgup87, sdong
Reviewed By: haobo
CC: leveldb, dhruba
Differential Revision: https://reviews.facebook.net/D17997
Summary:
Add a skeleton binding and test for BackupableDB which shows that BackupableDB
and RocksDB can share the same JNI calls.
Test Plan:
make rocksdbjava
make jtest
Reviewers: haobo, ankgup87, sdong, dhruba
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17793
Summary:
* Add a class SizeUnit to store frequently used consts. Currently
it has KB, MB, GB, TB, and PB.
* Change the parameter type of Options.writeBufferSize and Options.blockSize
from int to long.
Test Plan:
make rocksdbjava
make jtest
Reviewers: haobo, ankgup87, sdong, dhruba
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17703
Summary:
Add java bindings for Options.block_cache and allow DbBenchmark to
set cache_size.
Test Plan:
make rocksdbjava
make jtest
make jdb_Bench
Reviewers: haobo, sdong, ankgup87
Reviewed By: ankgup87
CC: leveldb, dhruba
Differential Revision: https://reviews.facebook.net/D17481
Summary:
* Add a benchmark for java binding for rocksdb. The java benchmark
is a complete rewrite based on the c++ db/db_bench.cc and the
DbBenchmark in dain's java leveldb.
* Support multithreading.
* 'readseq' is currently not supported as it requires RocksDB Iterator.
* usage:
--benchmarks
Comma-separated list of operations to run in the specified order
Actual benchmarks:
fillseq -- write N values in sequential key order in async mode
fillrandom -- write N values in random key order in async mode
fillbatch -- write N/1000 batch where each batch has 1000 values
in random key order in sync mode
fillsync -- write N/100 values in random key order in sync mode
fill100K -- write N/1000 100K values in random order in async mode
readseq -- read N times sequentially
readrandom -- read N times in random order
readhot -- read N times in random order from 1% section of DB
Meta Operations:
delete -- delete DB
DEFAULT: [fillseq, readrandom, fillrandom]
--compression_ratio
Arrange to generate values that shrink to this fraction of
their original size after compression
DEFAULT: 0.5
--use_existing_db
If true, do not destroy the existing database. If you set this
flag and also specify a benchmark that wants a fresh database, that benchmark will fail.
DEFAULT: false
--num
Number of key/values to place in database.
DEFAULT: 1000000
--threads
Number of concurrent threads to run.
DEFAULT: 1
--reads
Number of read operations to do. If negative, do --nums reads.
--key_size
The size of each key in bytes.
DEFAULT: 16
--value_size
The size of each value in bytes.
DEFAULT: 100
--write_buffer_size
Number of bytes to buffer in memtable before compacting
(initialized to default value by 'main'.)
DEFAULT: 4194304
--cache_size
Number of bytes to use as a cache of uncompressed data.
Negative means use default settings.
DEFAULT: -1
--seed
Seed base for random number generators.
DEFAULT: 0
--db
Use the db with the following name.
DEFAULT: /tmp/rocksdbjni-bench
* Add RocksDB.write().
Test Plan: make jbench
Reviewers: haobo, sdong, dhruba, ankgup87
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17433
Summary:
Fixed the following column family related compile error.
./java/rocksjni/write_batch.cc:211:66: error: cannot initialize a parameter of type 'rocksdb::ColumnFamilyMemTables *' with an lvalue of type 'rocksdb::MemTable *'
rocksdb::Status s = rocksdb::WriteBatchInternal::InsertInto(b, mem, &options);
^~~
Test Plan:
make jni
make jtest
Reviewers: igor, haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17577
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
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
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
Summary:
* [java] Add a java api for rocksdb::Options, currently only supports create_if_missing.
* [java] Add a test for RocksDBException in RocksDBSample.
Test Plan: make jtest
Reviewers: haobo, sdong
Reviewed By: haobo
CC: leveldb, dhruba
Differential Revision: https://reviews.facebook.net/D17385
Summary:
* [java] RocksDB now does not implement Closeable.
* [java] RocksDB.close() is now synchronized.
* [c++] Fix a bug in rocksjni.cc that does not release a java reference before
throwing an exception.
Test Plan:
make jni
make jtest
Reviewers: haobo, sdong
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17355
Summary: Fix a bug in RocksDBSample.java and minor code improvement in rocksjni.cc.
Test Plan:
make jni
make jtest
Reviewers: haobo, sdong
Reviewed By: haobo
CC: leveldb
Differential Revision: https://reviews.facebook.net/D17325
Summary:
This diff contains a simple jni library for rocksdb which supports open, get,
put and closeusing default options (including Options, ReadOptions, and
WriteOptions.) In the usual case, Java developers can use the c++ rocksdb
library in the way similar to the following:
RocksDB db = RocksDB.open(path_to_db);
...
db.put("hello".getBytes(), "world".getBytes();
byte[] value = db.get("hello".getBytes());
...
db.close();
Specifically, this diff has the following major classes:
* RocksDB: a Java wrapper class which forwards the operations
from the java side to c++ rocksdb library.
* RocksDBException: ncapsulates the error of an operation.
This exception type is used to describe an internal error from
the c++ rocksdb library.
This diff also include a simple java sample code calling c++ rocksdb library.
To build the rocksdb jni library, simply run make jni, and make jtest will try to
build and run the sample code.
Note that if the rocksdb is not built with the default glibc that Java uses,
java will try to load the wrong glibc during the run time. As a result,
the sample code might not work properly during the run time.
Test Plan:
* make jni
* make jtest
Reviewers: haobo, dhruba, sdong, igor, ljin
Reviewed By: dhruba
CC: leveldb, xjin
Differential Revision: https://reviews.facebook.net/D17109
