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[Java] Add Java support for cache sharding.

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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
This commit is contained in:
Yueh-Hsuan Chiang
2014-07-22 09:48:37 -07:00
parent ae7743f226
commit d19aa25594
5 changed files with 49 additions and 5 deletions
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35
java/org/rocksdb/Options.java
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@@ -14,6 +14,7 @@ package org.rocksdb;
*/
public class Options extends RocksObject {
static final long DEFAULT_CACHE_SIZE = 8 << 20;
static final int DEFAULT_NUM_SHARD_BITS = -1;
/**
* Construct options for opening a RocksDB.
*
@@ -23,6 +24,7 @@ public class Options extends RocksObject {
public Options() {
super();
cacheSize_ = DEFAULT_CACHE_SIZE;
numShardBits_ = DEFAULT_NUM_SHARD_BITS;
newOptions();
env_ = RocksEnv.getDefault();
}
@@ -215,6 +217,7 @@ public class Options extends RocksObject {
* If cacheSize is non-positive, then cache will not be used.
*
* DEFAULT: 8M
* @see setCacheNumShardBits()
*/
public Options setCacheSize(long cacheSize) {
cacheSize_ = cacheSize;
@@ -223,11 +226,42 @@ public class Options extends RocksObject {
/**
* @return the amount of cache in bytes that will be used by RocksDB.
*
* @see cacheNumShardBits()
*/
public long cacheSize() {
return cacheSize_;
}
/**
* Controls the number of shards for the block cache.
* This is applied only if cacheSize is set to non-negative.
*
* @param numShardBits the number of shard bits. The resulting
* number of shards would be 2 ^ numShardBits. Any negative
* number means use default settings."
* @return the reference to the current option.
*
* @see setCacheSize()
*/
public Options setCacheNumShardBits(int numShardBits) {
numShardBits_ = numShardBits;
return this;
}
/**
* Returns the number of shard bits used in the block cache.
* The resulting number of shards would be 2 ^ (returned value).
* Any negative number means use default settings.
*
* @return the number of shard bits used in the block cache.
*
* @see cacheSize()
*/
public int cacheNumShardBits() {
return numShardBits_;
}
/**
* If true, an error will be thrown during RocksDB.open() if the
* database already exists.
@@ -2397,6 +2431,7 @@ public class Options extends RocksObject {
long handle, int prefixLength);
long cacheSize_;
int numShardBits_;
Filter filter_;
RocksEnv env_;
}