mirror of
https://github.com/XRPLF/rippled.git
synced 2025-12-06 17:27:55 +00:00
ef8b8a8ef6
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
98 lines
2.8 KiB
Java
98 lines
2.8 KiB
Java
package org.rocksdb;
|
|
|
|
/**
|
|
* The config for hash skip-list mem-table representation.
|
|
* Such mem-table representation contains a fix-sized array of
|
|
* buckets, where each bucket points to a skiplist (or null if the
|
|
* bucket is empty).
|
|
*
|
|
* Note that since this mem-table representation relies on the
|
|
* key prefix, it is required to invoke one of the usePrefixExtractor
|
|
* functions to specify how to extract key prefix given a key.
|
|
* If proper prefix-extractor is not set, then RocksDB will
|
|
* use the default memtable representation (SkipList) instead
|
|
* and post a warning in the LOG.
|
|
*/
|
|
public class HashSkipListMemTableConfig extends MemTableConfig {
|
|
public static final int DEFAULT_BUCKET_COUNT = 1000000;
|
|
public static final int DEFAULT_BRANCHING_FACTOR = 4;
|
|
public static final int DEFAULT_HEIGHT = 4;
|
|
|
|
public HashSkipListMemTableConfig() {
|
|
bucketCount_ = DEFAULT_BUCKET_COUNT;
|
|
branchingFactor_ = DEFAULT_BRANCHING_FACTOR;
|
|
height_ = DEFAULT_HEIGHT;
|
|
}
|
|
|
|
/**
|
|
* Set the number of hash buckets used in the hash skiplist memtable.
|
|
* Default = 1000000.
|
|
*
|
|
* @param count the number of hash buckets used in the hash
|
|
* skiplist memtable.
|
|
* @return the reference to the current HashSkipListMemTableConfig.
|
|
*/
|
|
public HashSkipListMemTableConfig setBucketCount(long count) {
|
|
bucketCount_ = count;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* @return the number of hash buckets
|
|
*/
|
|
public long bucketCount() {
|
|
return bucketCount_;
|
|
}
|
|
|
|
/**
|
|
* Set the height of the skip list. Default = 4.
|
|
*
|
|
* @return the reference to the current HashSkipListMemTableConfig.
|
|
*/
|
|
public HashSkipListMemTableConfig setHeight(int height) {
|
|
height_ = height;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* @return the height of the skip list.
|
|
*/
|
|
public int height() {
|
|
return height_;
|
|
}
|
|
|
|
/**
|
|
* Set the branching factor used in the hash skip-list memtable.
|
|
* This factor controls the probabilistic size ratio between adjacent
|
|
* links in the skip list.
|
|
*
|
|
* @param bf the probabilistic size ratio between adjacent link
|
|
* lists in the skip list.
|
|
* @return the reference to the current HashSkipListMemTableConfig.
|
|
*/
|
|
public HashSkipListMemTableConfig setBranchingFactor(int bf) {
|
|
branchingFactor_ = bf;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* @return branching factor, the probabilistic size ratio between
|
|
* adjacent links in the skip list.
|
|
*/
|
|
public int branchingFactor() {
|
|
return branchingFactor_;
|
|
}
|
|
|
|
@Override protected long newMemTableFactoryHandle() {
|
|
return newMemTableFactoryHandle(
|
|
bucketCount_, height_, branchingFactor_);
|
|
}
|
|
|
|
private native long newMemTableFactoryHandle(
|
|
long bucketCount, int height, int branchingFactor);
|
|
|
|
private long bucketCount_;
|
|
private int branchingFactor_;
|
|
private int height_;
|
|
}
|