[Java] Enable filluniquerandom, readseq, BloomFilter, and 70+ command-line options to DbBenchmark.java

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

java/org/rocksdb/Filter.java

@@ -20,7 +20,7 @@ public abstract class Filter {
   /**
    * Deletes underlying C++ filter pointer.
    */
-  public synchronized void dispose() {
+  protected synchronized void dispose() {
     if(nativeHandle_ != 0) {
       dispose0(nativeHandle_);
     }

java/org/rocksdb/Options.java

@@ -146,15 +146,21 @@ public class Options {
 
   /**
    * Use the specified filter policy to reduce disk reads.
+   *
+   * Note that the caller should not dispose the input filter as
+   * Options.dispose() will dispose this filter.
+   *
    * @param Filter policy java instance.
    * @return the instance of the current Options.
    * @see RocksDB.open()
    */
   public Options setFilter(Filter filter) {
     assert(isInitialized());
-    setFilter0(nativeHandle_, filter);
+    setFilterHandle(nativeHandle_, filter.nativeHandle_);
+    filter_ = filter;
     return this;
   }
+  private native void setFilterHandle(long optHandle, long filterHandle);
 
   /*
    * Disable compaction triggered by seek.
@@ -786,7 +792,8 @@ public class Options {
       long handle, int limit);
 
   /**
-   * The following two fields affect how archived logs will be deleted.
+   * WalTtlSeconds() and walSizeLimitMB() affect how archived logs
+   * will be deleted.
    * 1. If both set to 0, logs will be deleted asap and will not get into
    *    the archive.
    * 2. If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
@@ -800,6 +807,7 @@ public class Options {
    *    checks will be performed with ttl being first.
    *
    * @return the wal-ttl seconds
+   * @see walSizeLimitMB()
    */
   public long walTtlSeconds() {
     assert(isInitialized());
@@ -808,7 +816,8 @@ public class Options {
   private native long walTtlSeconds(long handle);
 
   /**
-   * The following two fields affect how archived logs will be deleted.
+   * WalTtlSeconds() and walSizeLimitMB() affect how archived logs
+   * will be deleted.
    * 1. If both set to 0, logs will be deleted asap and will not get into
    *    the archive.
    * 2. If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
@@ -823,13 +832,64 @@ public class Options {
    *
    * @param walTtlSeconds the ttl seconds
    * @return the reference to the current option.
+   * @see setWalSizeLimitMB()
    */
-  public Options setWALTtlSeconds(long walTtlSeconds) {
+  public Options setWalTtlSeconds(long walTtlSeconds) {
     assert(isInitialized());
-    setWALTtlSeconds(nativeHandle_, walTtlSeconds);
+    setWalTtlSeconds(nativeHandle_, walTtlSeconds);
     return this;
   }
-  private native void setWALTtlSeconds(long handle, long walTtlSeconds);
+  private native void setWalTtlSeconds(long handle, long walTtlSeconds);
+
+  /**
+   * WalTtlSeconds() and walSizeLimitMB() affect how archived logs
+   * will be deleted.
+   * 1. If both set to 0, logs will be deleted asap and will not get into
+   *    the archive.
+   * 2. If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
+   *    WAL files will be checked every 10 min and if total size is greater
+   *    then WAL_size_limit_MB, they will be deleted starting with the
+   *    earliest until size_limit is met. All empty files will be deleted.
+   * 3. If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
+   *    WAL files will be checked every WAL_ttl_secondsi / 2 and those that
+   *    are older than WAL_ttl_seconds will be deleted.
+   * 4. If both are not 0, WAL files will be checked every 10 min and both
+   *    checks will be performed with ttl being first.
+   *
+   * @return size limit in mega-bytes.
+   * @see walSizeLimitMB()
+   */
+  public long walSizeLimitMB() {
+    assert(isInitialized());
+    return walSizeLimitMB(nativeHandle_);
+  }
+  private native long walSizeLimitMB(long handle);
+
+  /**
+   * WalTtlSeconds() and walSizeLimitMB() affect how archived logs
+   * will be deleted.
+   * 1. If both set to 0, logs will be deleted asap and will not get into
+   *    the archive.
+   * 2. If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0,
+   *    WAL files will be checked every 10 min and if total size is greater
+   *    then WAL_size_limit_MB, they will be deleted starting with the
+   *    earliest until size_limit is met. All empty files will be deleted.
+   * 3. If WAL_ttl_seconds is not 0 and WAL_size_limit_MB is 0, then
+   *    WAL files will be checked every WAL_ttl_secondsi / 2 and those that
+   *    are older than WAL_ttl_seconds will be deleted.
+   * 4. If both are not 0, WAL files will be checked every 10 min and both
+   *    checks will be performed with ttl being first.
+   *
+   * @param sizeLimitMB size limit in mega-bytes.
+   * @return the reference to the current option.
+   * @see setWalSizeLimitMB()
+   */
+  public Options setWalSizeLimitMB(long sizeLimitMB) {
+    assert(isInitialized());
+    setWalSizeLimitMB(nativeHandle_, sizeLimitMB);
+    return this;
+  }
+  private native void setWalSizeLimitMB(long handle, long sizeLimitMB);
 
   /**
    * Number of bytes to preallocate (via fallocate) the manifest
@@ -2298,8 +2358,7 @@ public class Options {
   private native void useFixedLengthPrefixExtractor(
       long handle, int prefixLength);
 
-  private native void setFilter0(long optHandle, Filter fp);
-
   long nativeHandle_;
   long cacheSize_;
+  Filter filter_;
 }

java/org/rocksdb/RocksDB.java

@@ -36,6 +36,7 @@ public class RocksDB {
     // the c++ one.
     Options options = new Options();
     db.open(options.nativeHandle_, options.cacheSize_, path);
+    db.transferCppRawPointersOwnership(options);
     options.dispose();
     return db;
   }
@@ -46,8 +47,12 @@ public class RocksDB {
    */
   public static RocksDB open(Options options, String path)
       throws RocksDBException {
+    // when non-default Options is used, keeping an Options reference
+    // in RocksDB can prevent Java to GC during the life-time of
+    // the currently-created RocksDB.
     RocksDB db = new RocksDB();
     db.open(options.nativeHandle_, options.cacheSize_, path);
+    db.transferCppRawPointersOwnershipFrom(options);
     return db;
   }
 
@@ -195,6 +200,17 @@ public class RocksDB {
     nativeHandle_ = 0;
   }
 
+  /**
+   * Transfer the ownership of all c++ raw-pointers from Options
+   * to RocksDB to ensure the life-time of those raw-pointers
+   * will be at least as long as the life-time of any RocksDB
+   * that uses these raw-pointers.
+   */
+  protected void transferCppRawPointersOwnershipFrom(Options opt) {
+    filter_ = opt.filter_;
+    opt.filter_ = null;
+  }
+
   // native methods
   protected native void open(
       long optionsHandle, long cacheSize, String path) throws RocksDBException;
@@ -227,4 +243,5 @@ public class RocksDB {
   protected native void close0();
 
   protected long nativeHandle_;
+  protected Filter filter_;
 }

java/org/rocksdb/benchmark/DbBenchmark.java

@@ -54,6 +54,10 @@ class Stats {
   StringBuilder message_;
   boolean excludeFromMerge_;
 
+  // TODO(yhchiang): use the following arguments:
+  //   (Long)Flag.stats_interval
+  //   (Integer)Flag.stats_per_interval
+
   Stats(int id) {
     id_ = id;
     nextReport_ = 100;
@@ -163,6 +167,7 @@ public class DbBenchmark {
   }
 
   abstract class BenchmarkTask implements Callable<Stats> {
+    // TODO(yhchiang): use (Integer)Flag.perf_level.
     public BenchmarkTask(
         int tid, long randSeed, long numEntries, long keyRange) {
       tid_ = tid;
@@ -311,13 +316,73 @@ public class DbBenchmark {
     }
   }
 
+  class WriteUniqueRandomTask extends WriteTask {
+    static final int MAX_BUFFER_SIZE = 10000000;
+    public WriteUniqueRandomTask(
+        int tid, long randSeed, long numEntries, long keyRange,
+        WriteOptions writeOpt, long entriesPerBatch) {
+      super(tid, randSeed, numEntries, keyRange,
+            writeOpt, entriesPerBatch);
+      initRandomKeySequence();
+    }
+    public WriteUniqueRandomTask(
+        int tid, long randSeed, long numEntries, long keyRange,
+        WriteOptions writeOpt, long entriesPerBatch,
+        long maxWritesPerSecond) {
+      super(tid, randSeed, numEntries, keyRange,
+            writeOpt, entriesPerBatch,
+            maxWritesPerSecond);
+      initRandomKeySequence();
+    }
+    @Override protected void getKey(byte[] key, long id, long range) {
+      generateKeyFromLong(key, nextUniqueRandom());
+    }
+
+    protected void initRandomKeySequence() {
+      bufferSize_ = MAX_BUFFER_SIZE;
+      if (bufferSize_ > keyRange_) {
+        bufferSize_ = (int) keyRange_;
+      }
+      currentKeyCount_ = bufferSize_;
+      keyBuffer_ = new long[MAX_BUFFER_SIZE];
+      for (int k = 0; k < bufferSize_; ++k) {
+        keyBuffer_[k] = k;
+      }
+    }
+
+    /**
+     * Semi-randomly return the next unique key.  It is guaranteed to be
+     * fully random if keyRange_ <= MAX_BUFFER_SIZE.
+     */
+    long nextUniqueRandom() {
+      if (bufferSize_ == 0) {
+        System.err.println("bufferSize_ == 0.");
+        return 0;
+      }
+      int r = rand_.nextInt(bufferSize_);
+      // randomly pick one from the keyBuffer
+      long randKey = keyBuffer_[r];
+      if (currentKeyCount_ < keyRange_) {
+        // if we have not yet inserted all keys, insert next new key to [r].
+        keyBuffer_[r] = currentKeyCount_++;
+      } else {
+        // move the last element to [r] and decrease the size by 1.
+        keyBuffer_[r] = keyBuffer_[--bufferSize_];
+      }
+      return randKey;
+    }
+
+    int bufferSize_;
+    long currentKeyCount_;
+    long[] keyBuffer_;
+  }
+
   class ReadRandomTask extends BenchmarkTask {
     public ReadRandomTask(
         int tid, long randSeed, long numEntries, long keyRange) {
       super(tid, randSeed, numEntries, keyRange);
     }
     @Override public void runTask() throws RocksDBException {
-      stats_.found_ = 0;
       byte[] key = new byte[keySize_];
       byte[] value = new byte[valueSize_];
       for (long i = 0; i < numEntries_; i++) {
@@ -338,18 +403,22 @@ public class DbBenchmark {
 
   class ReadSequentialTask extends BenchmarkTask {
     public ReadSequentialTask(
-        int tid, long randSeed, long numEntries, long keyRange, long initId) {
+        int tid, long randSeed, long numEntries, long keyRange) {
       super(tid, randSeed, numEntries, keyRange);
-      initId_ = initId;
     }
     @Override public void runTask() throws RocksDBException {
-      // make sure we have enough things to read in sequential
+      org.rocksdb.Iterator iter = db_.newIterator();
-      if (numEntries_ > keyRange_ - initId_) {
+      long i;
-        numEntries_ = keyRange_ - initId_;
+      for (iter.seekToFirst(), i = 0;
+           iter.isValid() && i < numEntries_;
+           iter.next(), ++i) {
+        stats_.found_++;
+        stats_.finishedSingleOp(iter.key().length + iter.value().length);
+        if (isFinished()) {
+          return;
+        }
       }
-      throw new UnsupportedOperationException();
     }
-    private long initId_;
   }
 
   public DbBenchmark(Map<Flag, Object> flags) throws Exception {
@@ -360,22 +429,33 @@ public class DbBenchmark {
         flags.get(Flag.num) : flags.get(Flag.reads));
     keySize_ = (Integer) flags.get(Flag.key_size);
     valueSize_ = (Integer) flags.get(Flag.value_size);
-    writeBufferSize_ = (Integer) flags.get(Flag.write_buffer_size) > 0 ?
-        (Integer) flags.get(Flag.write_buffer_size) : 0;
     compressionRatio_ = (Double) flags.get(Flag.compression_ratio);
     useExisting_ = (Boolean) flags.get(Flag.use_existing_db);
     randSeed_ = (Long) flags.get(Flag.seed);
     databaseDir_ = (String) flags.get(Flag.db);
     writesPerSeconds_ = (Integer) flags.get(Flag.writes_per_second);
     cacheSize_ = (Long) flags.get(Flag.cache_size);
-    gen_ = new RandomGenerator(compressionRatio_);
+    gen_ = new RandomGenerator(randSeed_, compressionRatio_);
     memtable_ = (String) flags.get(Flag.memtablerep);
     maxWriteBufferNumber_ = (Integer) flags.get(Flag.max_write_buffer_number);
     prefixSize_ = (Integer) flags.get(Flag.prefix_size);
     keysPerPrefix_ = (Integer) flags.get(Flag.keys_per_prefix);
     hashBucketCount_ = (Long) flags.get(Flag.hash_bucket_count);
     usePlainTable_ = (Boolean) flags.get(Flag.use_plain_table);
+    flags_ = flags;
     finishLock_ = new Object();
+    // options.setPrefixSize((Integer)flags_.get(Flag.prefix_size));
+    // options.setKeysPerPrefix((Long)flags_.get(Flag.keys_per_prefix));
+  }
+
+  private void prepareReadOptions(ReadOptions options) {
+    options.setVerifyChecksums((Boolean)flags_.get(Flag.verify_checksum));
+    options.setTailing((Boolean)flags_.get(Flag.use_tailing_iterator));
+  }
+
+  private void prepareWriteOptions(WriteOptions options) {
+    options.setSync((Boolean)flags_.get(Flag.sync));
+    options.setDisableWAL((Boolean)flags_.get(Flag.disable_wal));
   }
 
   private void prepareOptions(Options options) {
@@ -405,9 +485,119 @@ public class DbBenchmark {
           options.memTableFactoryName());
     }
     if (usePlainTable_) {
-      options.setSstFormatConfig(
+      options.setTableFormatConfig(
           new PlainTableConfig().setKeySize(keySize_));
     }
+    options.setMaxWriteBufferNumber(
+        (Integer)flags_.get(Flag.max_write_buffer_number));
+    options.setMaxBackgroundCompactions(
+        (Integer)flags_.get(Flag.max_background_compactions));
+    options.setMaxBackgroundFlushes(
+        (Integer)flags_.get(Flag.max_background_flushes));
+    options.setCacheSize(
+        (Long)flags_.get(Flag.cache_size));
+    options.setBlockSize(
+        (Integer)flags_.get(Flag.block_size));
+    options.setMaxOpenFiles(
+        (Integer)flags_.get(Flag.open_files));
+    options.setCreateIfMissing(
+        !(Boolean)flags_.get(Flag.use_existing_db));
+    options.setTableCacheRemoveScanCountLimit(
+        (Integer)flags_.get(Flag.cache_remove_scan_count_limit));
+    options.setDisableDataSync(
+        (Boolean)flags_.get(Flag.disable_data_sync));
+    options.setUseFsync(
+        (Boolean)flags_.get(Flag.use_fsync));
+    options.setWalDir(
+        (String)flags_.get(Flag.wal_dir));
+    options.setDisableSeekCompaction(
+        (Boolean)flags_.get(Flag.disable_seek_compaction));
+    options.setDeleteObsoleteFilesPeriodMicros(
+        (Long)flags_.get(Flag.delete_obsolete_files_period_micros));
+    options.setTableCacheNumshardbits(
+        (Integer)flags_.get(Flag.table_cache_numshardbits));
+    options.setAllowMmapReads(
+        (Boolean)flags_.get(Flag.mmap_read));
+    options.setAllowMmapWrites(
+        (Boolean)flags_.get(Flag.mmap_write));
+    options.setAdviseRandomOnOpen(
+        (Boolean)flags_.get(Flag.advise_random_on_open));
+    options.setUseAdaptiveMutex(
+        (Boolean)flags_.get(Flag.use_adaptive_mutex));
+    options.setBytesPerSync(
+        (Long)flags_.get(Flag.bytes_per_sync));
+    options.setBloomLocality(
+        (Integer)flags_.get(Flag.bloom_locality));
+    options.setMinWriteBufferNumberToMerge(
+        (Integer)flags_.get(Flag.min_write_buffer_number_to_merge));
+    options.setMemtablePrefixBloomBits(
+        (Integer)flags_.get(Flag.memtable_bloom_bits));
+    options.setNumLevels(
+        (Integer)flags_.get(Flag.num_levels));
+    options.setTargetFileSizeBase(
+        (Integer)flags_.get(Flag.target_file_size_base));
+    options.setTargetFileSizeMultiplier(
+        (Integer)flags_.get(Flag.target_file_size_multiplier));
+    options.setMaxBytesForLevelBase(
+        (Integer)flags_.get(Flag.max_bytes_for_level_base));
+    options.setMaxBytesForLevelMultiplier(
+        (Integer)flags_.get(Flag.max_bytes_for_level_multiplier));
+    options.setLevelZeroStopWritesTrigger(
+        (Integer)flags_.get(Flag.level0_stop_writes_trigger));
+    options.setLevelZeroSlowdownWritesTrigger(
+        (Integer)flags_.get(Flag.level0_slowdown_writes_trigger));
+    options.setLevelZeroFileNumCompactionTrigger(
+        (Integer)flags_.get(Flag.level0_file_num_compaction_trigger));
+    options.setSoftRateLimit(
+        (Double)flags_.get(Flag.soft_rate_limit));
+    options.setHardRateLimit(
+        (Double)flags_.get(Flag.hard_rate_limit));
+    options.setRateLimitDelayMaxMilliseconds(
+        (Integer)flags_.get(Flag.rate_limit_delay_max_milliseconds));
+    options.setMaxGrandparentOverlapFactor(
+        (Integer)flags_.get(Flag.max_grandparent_overlap_factor));
+    options.setDisableAutoCompactions(
+        (Boolean)flags_.get(Flag.disable_auto_compactions));
+    options.setSourceCompactionFactor(
+        (Integer)flags_.get(Flag.source_compaction_factor));
+    options.setFilterDeletes(
+        (Boolean)flags_.get(Flag.filter_deletes));
+    options.setMaxSuccessiveMerges(
+        (Integer)flags_.get(Flag.max_successive_merges));
+    options.setWalTtlSeconds((Long)flags_.get(Flag.wal_ttl_seconds));
+    options.setWalSizeLimitMB((Long)flags_.get(Flag.wal_size_limit_MB));
+    int bloomBits = (Integer)flags_.get(Flag.bloom_bits);
+    if (bloomBits > 0) {
+      // Internally, options will keep a reference to this BloomFilter.
+      // This will disallow Java to GC this BloomFilter.  In addition,
+      // options.dispose() will release the c++ object of this BloomFilter.
+      // As a result, the caller should not directly call
+      // BloomFilter.dispose().
+      options.setFilter(new BloomFilter(bloomBits));
+    }
+    /* TODO(yhchiang): enable the following parameters
+    options.setCompressionType((String)flags_.get(Flag.compression_type));
+    options.setCompressionLevel((Integer)flags_.get(Flag.compression_level));
+    options.setMinLevelToCompress((Integer)flags_.get(Flag.min_level_to_compress));
+    options.setHdfs((String)flags_.get(Flag.hdfs)); // env
+    options.setCacheNumshardbits((Integer)flags_.get(Flag.cache_numshardbits));
+    options.setStatistics((Boolean)flags_.get(Flag.statistics));
+    options.setUniversalSizeRatio(
+        (Integer)flags_.get(Flag.universal_size_ratio));
+    options.setUniversalMinMergeWidth(
+        (Integer)flags_.get(Flag.universal_min_merge_width));
+    options.setUniversalMaxMergeWidth(
+        (Integer)flags_.get(Flag.universal_max_merge_width));
+    options.setUniversalMaxSizeAmplificationPercent(
+        (Integer)flags_.get(Flag.universal_max_size_amplification_percent));
+    options.setUniversalCompressionSizePercent(
+        (Integer)flags_.get(Flag.universal_compression_size_percent));
+    // TODO(yhchiang): add RocksDB.openForReadOnly() to enable Flag.readonly
+    // TODO(yhchiang): enable Flag.merge_operator by switch
+    options.setAccessHintOnCompactionStart(
+        (String)flags_.get(Flag.compaction_fadvice));
+    // available values of fadvice are "NONE", "NORMAL", "SEQUENTIAL", "WILLNEED" for fadvice
+    */
   }
 
   private void run() throws RocksDBException {
@@ -424,6 +614,9 @@ public class DbBenchmark {
       List<Callable<Stats>> tasks = new ArrayList<Callable<Stats>>();
       List<Callable<Stats>> bgTasks = new ArrayList<Callable<Stats>>();
       WriteOptions writeOpt = new WriteOptions();
+      prepareWriteOptions(writeOpt);
+      ReadOptions readOpt = new ReadOptions();
+      prepareReadOptions(readOpt);
       int currentTaskId = 0;
       boolean known = true;
 
@@ -436,6 +629,9 @@ public class DbBenchmark {
       } else if (benchmark.equals("fillrandom")) {
         tasks.add(new WriteRandomTask(
             currentTaskId++, randSeed_, num_, num_, writeOpt, 1));
+      } else if (benchmark.equals("filluniquerandom")) {
+        tasks.add(new WriteUniqueRandomTask(
+            currentTaskId++, randSeed_, num_, num_, writeOpt, 1));
       } else if (benchmark.equals("fillsync")) {
         writeOpt.setSync(true);
         tasks.add(new WriteRandomTask(
@@ -444,13 +640,12 @@ public class DbBenchmark {
       } else if (benchmark.equals("readseq")) {
         for (int t = 0; t < threadNum_; ++t) {
           tasks.add(new ReadSequentialTask(
-              currentTaskId++, randSeed_, reads_ / threadNum_,
+              currentTaskId++, randSeed_, reads_, num_));
-              num_, (num_ / threadNum_) * t));
         }
       } else if (benchmark.equals("readrandom")) {
         for (int t = 0; t < threadNum_; ++t) {
           tasks.add(new ReadRandomTask(
-              currentTaskId++, randSeed_, reads_ / threadNum_, num_));
+              currentTaskId++, randSeed_, reads_, num_));
         }
       } else if (benchmark.equals("readwhilewriting")) {
         WriteTask writeTask = new WriteRandomTask(
@@ -508,6 +703,7 @@ public class DbBenchmark {
         }
       }
       writeOpt.dispose();
+      readOpt.dispose();
     }
     options.dispose();
     db_.close();
@@ -573,7 +769,7 @@ public class DbBenchmark {
 
     System.out.printf(
         "%-16s : %11.5f micros/op; %6.1f MB/s; %d / %d task(s) finished.\n",
-        benchmark, elapsedSeconds * 1e6 / num_,
+        benchmark, elapsedSeconds * 1e6 / stats.done_,
         (stats.bytes_ / 1048576.0) / elapsedSeconds,
         taskFinishedCount, concurrentThreads);
   }
@@ -616,14 +812,13 @@ public class DbBenchmark {
   static void printHelp() {
     System.out.println("usage:");
     for (Flag flag : Flag.values()) {
-      System.out.format("  --%s%n    %s%n",
+      System.out.format("  --%s%n\t%s%n",
           flag.name(),
           flag.desc());
       if (flag.getDefaultValue() != null) {
-        System.out.format("    DEFAULT: %s%n",
+        System.out.format("\tDEFAULT: %s%n",
             flag.getDefaultValue().toString());
       }
-      System.out.println("");
     }
   }
 
@@ -692,15 +887,13 @@ public class DbBenchmark {
         return new ArrayList<String>(Arrays.asList(value.split(",")));
       }
     },
-
     compression_ratio(0.5d,
         "Arrange to generate values that shrink to this fraction of\n" +
-        "\ttheir original size after compression") {
+        "\ttheir original size after compression.") {
       @Override public Object parseValue(String value) {
         return Double.parseDouble(value);
       }
     },
-
     use_existing_db(false,
         "If true, do not destroy the existing database.  If you set this\n" +
         "\tflag and also specify a benchmark that wants a fresh database,\n" +
@@ -709,51 +902,43 @@ public class DbBenchmark {
         return Boolean.parseBoolean(value);
       }
     },
-
     num(1000000,
         "Number of key/values to place in database.") {
       @Override public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     threads(1,
         "Number of concurrent threads to run.") {
       @Override public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     reads(null,
         "Number of read operations to do.  If negative, do --nums reads.") {
-      @Override
+      @Override public Object parseValue(String value) {
-      public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     key_size(16,
         "The size of each key in bytes.") {
       @Override public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     value_size(100,
         "The size of each value in bytes.") {
       @Override public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     write_buffer_size(4 << 20,
         "Number of bytes to buffer in memtable before compacting\n" +
         "\t(initialized to default value by 'main'.)") {
       @Override public Object parseValue(String value) {
-        return Integer.parseInt(value);
+        return Long.parseLong(value);
       }
     },
-
     max_write_buffer_number(2,
              "The number of in-memory memtables. Each memtable is of size\n" +
              "\twrite_buffer_size.") {
@@ -761,14 +946,12 @@ public class DbBenchmark {
         return Integer.parseInt(value);
       }
     },
-
     prefix_size(0, "Controls the prefix size for HashSkipList, HashLinkedList,\n" +
                    "\tand plain table.") {
       @Override public Object parseValue(String value) {
         return Integer.parseInt(value);
       }
     },
-
     keys_per_prefix(0, "Controls the average number of keys generated\n" +
              "\tper prefix, 0 means no special handling of the prefix,\n" +
              "\ti.e. use the prefix comes with the generated random number.") {
@@ -776,7 +959,6 @@ public class DbBenchmark {
         return Integer.parseInt(value);
       }
     },
-
     memtablerep("skip_list",
         "The memtable format.  Available options are\n" +
         "\tskip_list,\n" +
@@ -787,7 +969,6 @@ public class DbBenchmark {
         return value;
       }
     },
-
     hash_bucket_count(SizeUnit.MB,
         "The number of hash buckets used in the hash-bucket-based\n" +
         "\tmemtables.  Memtables that currently support this argument are\n" +
@@ -796,7 +977,6 @@ public class DbBenchmark {
         return Long.parseLong(value);
       }
     },
-
     writes_per_second(10000,
         "The write-rate of the background writer used in the\n" +
         "\t`readwhilewriting` benchmark.  Non-positive number indicates\n" +
@@ -805,14 +985,12 @@ public class DbBenchmark {
         return Integer.parseInt(value);
       }
     },
-
     use_plain_table(false,
         "Use plain-table sst format.") {
       @Override public Object parseValue(String value) {
         return Boolean.parseBoolean(value);
       }
     },
-
     cache_size(-1L,
         "Number of bytes to use as a cache of uncompressed data.\n" +
         "\tNegative means use default settings.") {
@@ -820,15 +998,445 @@ public class DbBenchmark {
         return Long.parseLong(value);
       }
     },
-
     seed(0L,
         "Seed base for random number generators.") {
       @Override public Object parseValue(String value) {
         return Long.parseLong(value);
       }
     },
-
+    num_levels(7,
-
+        "The total number of levels.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    numdistinct(1000,
+        "Number of distinct keys to use. Used in RandomWithVerify to\n" +
+        "\tread/write on fewer keys so that gets are more likely to find the\n" +
+        "\tkey and puts are more likely to update the same key.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    merge_keys(-1,
+        "Number of distinct keys to use for MergeRandom and\n" +
+        "\tReadRandomMergeRandom.\n" +
+        "\tIf negative, there will be FLAGS_num keys.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    bloom_locality(0,"Control bloom filter probes locality.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    duration(0,"Time in seconds for the random-ops tests to run.\n" +
+        "\tWhen 0 then num & reads determine the test duration.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    num_multi_db(0,
+        "Number of DBs used in the benchmark. 0 means single DB.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    histogram(false,"Print histogram of operation timings.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    min_write_buffer_number_to_merge(
+        defaultOptions_.minWriteBufferNumberToMerge(),
+        "The minimum number of write buffers that will be merged together\n" +
+        "\tbefore writing to storage. This is cheap because it is an\n" +
+        "\tin-memory merge. If this feature is not enabled, then all these\n" +
+        "\twrite buffers are flushed to L0 as separate files and this\n" +
+        "\tincreases read amplification because a get request has to check\n" +
+        "\tin all of these files. Also, an in-memory merge may result in\n" +
+        "\twriting less data to storage if there are duplicate records\n" +
+        "\tin each of these individual write buffers.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    max_background_compactions(
+        defaultOptions_.maxBackgroundCompactions(),
+        "The maximum number of concurrent background compactions\n" +
+        "\tthat can occur in parallel.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    max_background_flushes(
+        defaultOptions_.maxBackgroundFlushes(),
+        "The maximum number of concurrent background flushes\n" +
+        "\tthat can occur in parallel.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    /* TODO(yhchiang): enable the following
+    compaction_style((int32_t) defaultOptions_.compactionStyle(),
+        "style of compaction: level-based vs universal.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },*/
+    universal_size_ratio(0,
+        "Percentage flexibility while comparing file size\n" +
+        "\t(for universal compaction only).") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    universal_min_merge_width(0,"The minimum number of files in a\n" +
+        "\tsingle compaction run (for universal compaction only).") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    universal_max_merge_width(0,"The max number of files to compact\n" +
+        "\tin universal style compaction.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    universal_max_size_amplification_percent(0,
+        "The max size amplification for universal style compaction.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    universal_compression_size_percent(-1,
+        "The percentage of the database to compress for universal\n" +
+        "\tcompaction. -1 means compress everything.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    block_size(defaultOptions_.blockSize(),
+        "Number of bytes in a block.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    compressed_cache_size(-1,
+        "Number of bytes to use as a cache of compressed data.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    open_files(defaultOptions_.maxOpenFiles(),
+        "Maximum number of files to keep open at the same time\n" +
+        "\t(use default if == 0)") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    bloom_bits(-1,"Bloom filter bits per key. Negative means\n" +
+        "\tuse default settings.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    memtable_bloom_bits(0,"Bloom filter bits per key for memtable.\n" +
+        "\tNegative means no bloom filter.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    cache_numshardbits(-1,"Number of shards for the block cache\n" +
+        "\tis 2 ** cache_numshardbits. Negative means use default settings.\n" +
+        "\tThis is applied only if FLAGS_cache_size is non-negative.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    cache_remove_scan_count_limit(32,"") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    verify_checksum(false,"Verify checksum for every block read\n" +
+        "\tfrom storage.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    statistics(false,"Database statistics.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    writes(-1,"Number of write operations to do. If negative, do\n" +
+        "\t--num reads.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    sync(false,"Sync all writes to disk.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    disable_data_sync(false,"If true, do not wait until data is\n" +
+        "\tsynced to disk.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    use_fsync(false,"If true, issue fsync instead of fdatasync.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    disable_wal(false,"If true, do not write WAL for write.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    wal_dir("", "If not empty, use the given dir for WAL.") {
+      @Override public Object parseValue(String value) {
+        return value;
+      }
+    },
+    target_file_size_base(2 * 1048576,"Target file size at level-1") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    target_file_size_multiplier(1,
+        "A multiplier to compute target level-N file size (N >= 2)") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    max_bytes_for_level_base(10 * 1048576,
+      "Max bytes for level-1") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    max_bytes_for_level_multiplier(10,
+        "A multiplier to compute max bytes for level-N (N >= 2)") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    level0_stop_writes_trigger(12,"Number of files in level-0\n" +
+        "\tthat will trigger put stop.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    level0_slowdown_writes_trigger(8,"Number of files in level-0\n" +
+        "\tthat will slow down writes.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    level0_file_num_compaction_trigger(4,"Number of files in level-0\n" +
+        "\twhen compactions start.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    readwritepercent(90,"Ratio of reads to reads/writes (expressed\n" +
+        "\tas percentage) for the ReadRandomWriteRandom workload. The\n" +
+        "\tdefault value 90 means 90% operations out of all reads and writes\n" +
+        "\toperations are reads. In other words, 9 gets for every 1 put.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    mergereadpercent(70,"Ratio of merges to merges&reads (expressed\n" +
+        "\tas percentage) for the ReadRandomMergeRandom workload. The\n" +
+        "\tdefault value 70 means 70% out of all read and merge operations\n" +
+        "\tare merges. In other words, 7 merges for every 3 gets.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    deletepercent(2,"Percentage of deletes out of reads/writes/\n" +
+        "\tdeletes (used in RandomWithVerify only). RandomWithVerify\n" +
+        "\tcalculates writepercent as (100 - FLAGS_readwritepercent -\n" +
+        "\tdeletepercent), so deletepercent must be smaller than (100 -\n" +
+        "\tFLAGS_readwritepercent)") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    disable_seek_compaction(false,"Option to disable compaction\n" +
+        "\ttriggered by read.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    delete_obsolete_files_period_micros(0,"Option to delete\n" +
+        "\tobsolete files periodically. 0 means that obsolete files are\n" +
+        "\tdeleted after every compaction run.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    compression_level(-1,
+        "Compression level. For zlib this should be -1 for the\n" +
+        "\tdefault level, or between 0 and 9.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    min_level_to_compress(-1,"If non-negative, compression starts\n" +
+        "\tfrom this level. Levels with number < min_level_to_compress are\n" +
+        "\tnot compressed. Otherwise, apply compression_type to\n" +
+        "\tall levels.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    table_cache_numshardbits(4,"") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    stats_interval(0,"Stats are reported every N operations when\n" +
+        "\tthis is greater than zero. When 0 the interval grows over time.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    stats_per_interval(0,"Reports additional stats per interval when\n" +
+        "\tthis is greater than 0.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    perf_level(0,"Level of perf collection.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    soft_rate_limit(0.0,"") {
+      @Override public Object parseValue(String value) {
+        return Double.parseDouble(value);
+      }
+    },
+    hard_rate_limit(0.0,"When not equal to 0 this make threads\n" +
+        "\tsleep at each stats reporting interval until the compaction\n" +
+        "\tscore for all levels is less than or equal to this value.") {
+      @Override public Object parseValue(String value) {
+        return Double.parseDouble(value);
+      }
+    },
+    rate_limit_delay_max_milliseconds(1000,
+        "When hard_rate_limit is set then this is the max time a put will\n" +
+        "\tbe stalled.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    max_grandparent_overlap_factor(10,"Control maximum bytes of\n" +
+        "\toverlaps in grandparent (i.e., level+2) before we stop building a\n" +
+        "\tsingle file in a level->level+1 compaction.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    readonly(false,"Run read only benchmarks.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    disable_auto_compactions(false,"Do not auto trigger compactions.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    source_compaction_factor(1,"Cap the size of data in level-K for\n" +
+        "\ta compaction run that compacts Level-K with Level-(K+1) (for\n" +
+        "\tK >= 1)") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
+    wal_ttl_seconds(0L,"Set the TTL for the WAL Files in seconds.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    wal_size_limit_MB(0L,"Set the size limit for the WAL Files\n" +
+        "\tin MB.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    /* TODO(yhchiang): enable the following
+    bufferedio(rocksdb::EnvOptions().use_os_buffer,
+        "Allow buffered io using OS buffers.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    */
+    mmap_read(false,
+        "Allow reads to occur via mmap-ing files.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    mmap_write(false,
+        "Allow writes to occur via mmap-ing files.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    advise_random_on_open(defaultOptions_.adviseRandomOnOpen(),
+        "Advise random access on table file open.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    compaction_fadvice("NORMAL",
+      "Access pattern advice when a file is compacted.") {
+      @Override public Object parseValue(String value) {
+        return value;
+      }
+    },
+    use_tailing_iterator(false,
+        "Use tailing iterator to access a series of keys instead of get.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    use_adaptive_mutex(defaultOptions_.useAdaptiveMutex(),
+        "Use adaptive mutex.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    bytes_per_sync(defaultOptions_.bytesPerSync(),
+        "Allows OS to incrementally sync files to disk while they are\n" +
+        "\tbeing written, in the background. Issue one request for every\n" +
+        "\tbytes_per_sync written. 0 turns it off.") {
+      @Override public Object parseValue(String value) {
+        return Long.parseLong(value);
+      }
+    },
+    filter_deletes(false," On true, deletes use bloom-filter and drop\n" +
+        "\tthe delete if key not present.") {
+      @Override public Object parseValue(String value) {
+        return Boolean.parseBoolean(value);
+      }
+    },
+    max_successive_merges(0,"Maximum number of successive merge\n" +
+        "\toperations on a key in the memtable.") {
+      @Override public Object parseValue(String value) {
+        return Integer.parseInt(value);
+      }
+    },
     db("/tmp/rocksdbjni-bench",
        "Use the db with the following name.") {
       @Override public Object parseValue(String value) {
@@ -859,25 +1467,23 @@ public class DbBenchmark {
     private final byte[] data_;
     private int dataLength_;
     private int position_;
+    Random rand_;
 
-    private RandomGenerator(double compressionRatio) {
+    private RandomGenerator(long seed, double compressionRatio) {
       // We use a limited amount of data over and over again and ensure
       // that it is larger than the compression window (32KB), and also
       // large enough to serve all typical value sizes we want to write.
-      Random rand = new Random(301);
+      rand_ = new Random(seed);
       dataLength_ = 1048576 + 100;
       data_ = new byte[dataLength_];
       // TODO(yhchiang): mimic test::CompressibleString?
       for (int i = 0; i < dataLength_; ++i) {
-        data_[i] = (byte) (' ' + rand.nextInt(95));
+        data_[i] = (byte) (' ' + rand_.nextInt(95));
       }
     }
 
     private byte[] generate(int length) {
-      if (position_ + length > data_.length) {
+      position_ = rand_.nextInt(data_.length - length);
-        position_ = 0;
-        assert (length < data_.length);
-      }
       return Arrays.copyOfRange(data_, position_, position_ + length);
     }
   }
@@ -911,7 +1517,6 @@ public class DbBenchmark {
   long startTime_;
 
   // memtable related
-  final int writeBufferSize_;
   final int maxWriteBufferNumber_;
   final int prefixSize_;
   final int keysPerPrefix_;
@@ -923,4 +1528,8 @@ public class DbBenchmark {
 
   Object finishLock_;
   boolean isFinished_;
+  Map<Flag, Object> flags_;
+  // as the scope of a static member equals to the scope of the problem,
+  // we let its c++ pointer to be disposed in its finalizer.
+  static Options defaultOptions_ = new Options();
 }

java/org/rocksdb/test/OptionsTest.java

@@ -123,9 +123,9 @@ public class OptionsTest {
       assert(opt.tableCacheRemoveScanCountLimit() == intValue);
     }
 
-    { // WALTtlSeconds test
+    { // WalTtlSeconds test
       long longValue = rand.nextLong();
-      opt.setWALTtlSeconds(longValue);
+      opt.setWalTtlSeconds(longValue);
       assert(opt.walTtlSeconds() == longValue);
     }
 

java/rocksjni/options.cc

@@ -122,13 +122,13 @@ jlong Java_org_rocksdb_Options_statisticsPtr(
 
 /*
  * Class:     org_rocksdb_Options
- * Method:    setFilter0
+ * Method:    setFilterHandle
  * Signature: (JJ)V
  */
-void Java_org_rocksdb_Options_setFilter0(
+void Java_org_rocksdb_Options_setFilterHandle(
-    JNIEnv* env, jobject jobj, jlong jopt_handle, jobject jfp) {
+    JNIEnv* env, jobject jobj, jlong jopt_handle, jlong jfilter_handle) {
   reinterpret_cast<rocksdb::Options*>(jopt_handle)->filter_policy =
-      rocksdb::FilterJni::getHandle(env, jfp);
+      reinterpret_cast<rocksdb::FilterPolicy*>(jfilter_handle);
 }
 
 /*
@@ -602,15 +602,36 @@ jlong Java_org_rocksdb_Options_walTtlSeconds(
 
 /*
  * Class:     org_rocksdb_Options
- * Method:    setWALTtlSeconds
+ * Method:    setWalTtlSeconds
  * Signature: (JJ)V
  */
-void Java_org_rocksdb_Options_setWALTtlSeconds(
+void Java_org_rocksdb_Options_setWalTtlSeconds(
     JNIEnv* env, jobject jobj, jlong jhandle, jlong WAL_ttl_seconds) {
   reinterpret_cast<rocksdb::Options*>(jhandle)->WAL_ttl_seconds =
       static_cast<int64_t>(WAL_ttl_seconds);
 }
 
+/*
+ * Class:     org_rocksdb_Options
+ * Method:    walTtlSeconds
+ * Signature: (J)J
+ */
+jlong Java_org_rocksdb_Options_walSizeLimitMB(
+    JNIEnv* env, jobject jobj, jlong jhandle) {
+  return reinterpret_cast<rocksdb::Options*>(jhandle)->WAL_size_limit_MB;
+}
+
+/*
+ * Class:     org_rocksdb_Options
+ * Method:    setWalSizeLimitMB
+ * Signature: (JJ)V
+ */
+void Java_org_rocksdb_Options_setWalSizeLimitMB(
+    JNIEnv* env, jobject jobj, jlong jhandle, jlong WAL_size_limit_MB) {
+  reinterpret_cast<rocksdb::Options*>(jhandle)->WAL_size_limit_MB =
+      static_cast<int64_t>(WAL_size_limit_MB);
+}
+
 /*
  * Class:     org_rocksdb_Options
  * Method:    manifestPreallocationSize