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445e518bc7
commit f8f364b47f2784f16b401f27658f1c16eaf348ec
Author: Jay Edgar <jkedgar@fb.com>
Date: Tue Oct 17 15:19:31 2017 -0700
Add a hashed, hierarchical, wheel timer implementation
Summary:
In order to implement idle timeouts on detached sessions we need something inside MySQL that is lightweight and can handle calling events in the future with very little cost for cancelling or resetting the event. A hashed, hi
By default the timers are grouped into 10ms buckets (the 'hashed' part), though the size of the buckets is configurable at the creation of the timer. Each wheel (the 'wheel' part) maintains 256 buckets and cascades to the whe
Reviewed By: djwatson
Differential Revision: D6199806
fbshipit-source-id: 5e1590f
104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
/*
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Copyright (c) 2014, SkySQL Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#pragma once
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/* C++ system header files */
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#include <string>
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#include <unordered_map>
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/* RocksDB header files */
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#include "rocksdb/table.h"
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#include "rocksdb/utilities/options_util.h"
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/* MyRocks header files */
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#include "./rdb_comparator.h"
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namespace myrocks {
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/*
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Per-column family options configs.
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Per-column family option can be set
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- Globally (the same value applies to all column families)
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- Per column family: there is a {cf_name -> value} map,
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and also there is a default value which applies to column
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families not found in the map.
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*/
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class Rdb_cf_options {
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public:
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using Name_to_config_t = std::unordered_map<std::string, std::string>;
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Rdb_cf_options(const Rdb_cf_options &) = delete;
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Rdb_cf_options &operator=(const Rdb_cf_options &) = delete;
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Rdb_cf_options() = default;
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void get(const std::string &cf_name,
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rocksdb::ColumnFamilyOptions *const opts);
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void update(const std::string &cf_name, const std::string &cf_options);
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bool init(const rocksdb::BlockBasedTableOptions &table_options,
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std::shared_ptr<rocksdb::TablePropertiesCollectorFactory>
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prop_coll_factory,
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const char *const default_cf_options,
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const char *const override_cf_options);
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const rocksdb::ColumnFamilyOptions &get_defaults() const {
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return m_default_cf_opts;
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}
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static const rocksdb::Comparator *
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get_cf_comparator(const std::string &cf_name);
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std::shared_ptr<rocksdb::MergeOperator>
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get_cf_merge_operator(const std::string &cf_name);
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void get_cf_options(const std::string &cf_name,
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rocksdb::ColumnFamilyOptions *const opts)
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MY_ATTRIBUTE((__nonnull__));
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static bool parse_cf_options(const std::string &cf_options,
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Name_to_config_t *option_map);
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private:
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bool set_default(const std::string &default_config);
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bool set_override(const std::string &overide_config);
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/* Helper string manipulation functions */
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static void skip_spaces(const std::string &input, size_t *const pos);
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static bool find_column_family(const std::string &input, size_t *const pos,
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std::string *const key);
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static bool find_options(const std::string &input, size_t *const pos,
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std::string *const options);
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static bool find_cf_options_pair(const std::string &input, size_t *const pos,
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std::string *const cf,
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std::string *const opt_str);
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private:
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static Rdb_pk_comparator s_pk_comparator;
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static Rdb_rev_comparator s_rev_pk_comparator;
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/* CF name -> value map */
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Name_to_config_t m_name_map;
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/* The default value (if there is only one value, it is stored here) */
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std::string m_default_config;
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rocksdb::ColumnFamilyOptions m_default_cf_opts;
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};
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} // namespace myrocks
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