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8d178090be
Summary: RocksDB's `Cache` abstraction currently supports two priority levels for items: high (used for frequently accessed/highly valuable SST metablocks like index/filter blocks) and low (used for SST data blocks). Blobs are typically lower-value targets for caching than data blocks, since 1) with BlobDB, data blocks containing blob references conceptually form an index structure which has to be consulted before we can read the blob value, and 2) cached blobs represent only a single key-value, while cached data blocks generally contain multiple KVs. Since we would like to make it possible to use the same backing cache for the block cache and the blob cache, it would make sense to add a new, lower-than-low cache priority level (bottom level) for blobs so data blocks are prioritized over them. This task is a part of https://github.com/facebook/rocksdb/issues/10156 Pull Request resolved: https://github.com/facebook/rocksdb/pull/10309 Reviewed By: ltamasi Differential Revision: D38211655 Pulled By: gangliao fbshipit-source-id: 65ef33337db4d85277cc6f9782d67c421ad71dd5
50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// This file implements the "bridge" between Java and C++ for
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// ROCKSDB_NAMESPACE::LRUCache.
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#include "cache/lru_cache.h"
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#include <jni.h>
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#include "include/org_rocksdb_LRUCache.h"
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#include "rocksjni/cplusplus_to_java_convert.h"
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/*
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* Class: org_rocksdb_LRUCache
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* Method: newLRUCache
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* Signature: (JIZD)J
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*/
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jlong Java_org_rocksdb_LRUCache_newLRUCache(JNIEnv* /*env*/, jclass /*jcls*/,
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jlong jcapacity,
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jint jnum_shard_bits,
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jboolean jstrict_capacity_limit,
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jdouble jhigh_pri_pool_ratio,
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jdouble jlow_pri_pool_ratio) {
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auto* sptr_lru_cache = new std::shared_ptr<ROCKSDB_NAMESPACE::Cache>(
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ROCKSDB_NAMESPACE::NewLRUCache(
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static_cast<size_t>(jcapacity), static_cast<int>(jnum_shard_bits),
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static_cast<bool>(jstrict_capacity_limit),
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static_cast<double>(jhigh_pri_pool_ratio),
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nullptr /* memory_allocator */, rocksdb::kDefaultToAdaptiveMutex,
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rocksdb::kDontChargeCacheMetadata,
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static_cast<double>(jlow_pri_pool_ratio)));
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return GET_CPLUSPLUS_POINTER(sptr_lru_cache);
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}
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/*
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* Class: org_rocksdb_LRUCache
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* Method: disposeInternal
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* Signature: (J)V
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*/
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void Java_org_rocksdb_LRUCache_disposeInternal(JNIEnv* /*env*/,
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jobject /*jobj*/,
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jlong jhandle) {
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auto* sptr_lru_cache =
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reinterpret_cast<std::shared_ptr<ROCKSDB_NAMESPACE::Cache>*>(jhandle);
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delete sptr_lru_cache; // delete std::shared_ptr
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}
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