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
53 lines
1.5 KiB
Java
53 lines
1.5 KiB
Java
package org.rocksdb;
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/**
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* The config for hash linked list memtable representation
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* Such memtable contains a fix-sized array of buckets, where
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* each bucket points to a sorted singly-linked
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* list (or null if the bucket is empty).
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*
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* Note that since this mem-table representation relies on the
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* key prefix, it is required to invoke one of the usePrefixExtractor
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* functions to specify how to extract key prefix given a key.
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* If proper prefix-extractor is not set, then RocksDB will
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* use the default memtable representation (SkipList) instead
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* and post a warning in the LOG.
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*/
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public class HashLinkedListMemTableConfig extends MemTableConfig {
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public static final long DEFAULT_BUCKET_COUNT = 50000;
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public HashLinkedListMemTableConfig() {
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bucketCount_ = DEFAULT_BUCKET_COUNT;
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}
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/**
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* Set the number of buckets in the fixed-size array used
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* in the hash linked-list mem-table.
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*
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* @param count the number of hash buckets.
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* @return the reference to the current HashLinkedListMemTableConfig.
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*/
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public HashLinkedListMemTableConfig setBucketCount(long count) {
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bucketCount_ = count;
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return this;
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}
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/**
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* Returns the number of buckets that will be used in the memtable
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* created based on this config.
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*
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* @return the number of buckets
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*/
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public long bucketCount() {
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return bucketCount_;
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}
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@Override protected long newMemTableFactoryHandle() {
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return newMemTableFactoryHandle(bucketCount_);
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}
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private native long newMemTableFactoryHandle(long bucketCount);
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private long bucketCount_;
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}
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