fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
114 lines
4.2 KiB
C++
114 lines
4.2 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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#include "table/persistent_cache_helper.h"
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#include "table/block_based/block_based_table_reader.h"
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#include "table/format.h"
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namespace ROCKSDB_NAMESPACE {
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void PersistentCacheHelper::InsertRawPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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const char* data, const size_t size) {
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assert(cache_options.persistent_cache);
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assert(cache_options.persistent_cache->IsCompressed());
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// construct the page key
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char cache_key[BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length];
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auto key = BlockBasedTable::GetCacheKey(cache_options.key_prefix.c_str(),
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cache_options.key_prefix.size(),
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handle, cache_key);
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// insert content to cache
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cache_options.persistent_cache->Insert(key, data, size);
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}
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void PersistentCacheHelper::InsertUncompressedPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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const BlockContents& contents) {
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assert(cache_options.persistent_cache);
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assert(!cache_options.persistent_cache->IsCompressed());
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// Precondition:
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// (1) content is cacheable
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// (2) content is not compressed
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// construct the page key
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char cache_key[BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length];
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auto key = BlockBasedTable::GetCacheKey(cache_options.key_prefix.c_str(),
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cache_options.key_prefix.size(),
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handle, cache_key);
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// insert block contents to page cache
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cache_options.persistent_cache->Insert(key, contents.data.data(),
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contents.data.size());
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}
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Status PersistentCacheHelper::LookupRawPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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std::unique_ptr<char[]>* raw_data, const size_t raw_data_size) {
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#ifdef NDEBUG
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(void)raw_data_size;
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#endif
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assert(cache_options.persistent_cache);
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assert(cache_options.persistent_cache->IsCompressed());
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// construct the page key
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char cache_key[BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length];
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auto key = BlockBasedTable::GetCacheKey(cache_options.key_prefix.c_str(),
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cache_options.key_prefix.size(),
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handle, cache_key);
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// Lookup page
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size_t size;
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Status s = cache_options.persistent_cache->Lookup(key, raw_data, &size);
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if (!s.ok()) {
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// cache miss
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_MISS);
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return s;
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}
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// cache hit
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assert(raw_data_size == handle.size() + kBlockTrailerSize);
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assert(size == raw_data_size);
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_HIT);
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return Status::OK();
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}
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Status PersistentCacheHelper::LookupUncompressedPage(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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BlockContents* contents) {
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assert(cache_options.persistent_cache);
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assert(!cache_options.persistent_cache->IsCompressed());
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if (!contents) {
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// We shouldn't lookup in the cache. Either
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// (1) Nowhere to store
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return Status::NotFound();
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}
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// construct the page key
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char cache_key[BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length];
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auto key = BlockBasedTable::GetCacheKey(cache_options.key_prefix.c_str(),
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cache_options.key_prefix.size(),
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handle, cache_key);
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// Lookup page
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std::unique_ptr<char[]> data;
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size_t size;
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Status s = cache_options.persistent_cache->Lookup(key, &data, &size);
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if (!s.ok()) {
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// cache miss
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_MISS);
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return s;
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}
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// please note we are potentially comparing compressed data size with
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// uncompressed data size
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assert(handle.size() <= size);
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// update stats
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_HIT);
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// construct result and return
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*contents = BlockContents(std::move(data), size);
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return Status::OK();
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}
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} // namespace ROCKSDB_NAMESPACE
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