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7468ccfadf
commit d1bb19b8f751875472211312c8e810143a7ba4b6
Author: Manuel Ung <mung@fb.com>
Date: Fri Feb 3 11:50:34 2017 -0800
Add cardinality stats to information schema
Summary: This adds cardinality stats to the INFORMATION_SCHEMA.ROCKSDB_INDEX_FILE_MAP table. This is the only missing user collected properties from SST files that we don't expose, which is useful for debugging cardinality bugs.
Reviewed By: hermanlee
Differential Revision: D4509156
fbshipit-source-id: 2d3918a
111 lines
3.7 KiB
C++
111 lines
3.7 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 <map>
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#include <string>
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#include <vector>
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/* MySQL header files */
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#include "./sql_class.h"
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/* RocksDB header files */
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#include "rocksdb/db.h"
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/* MyRocks header files */
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#include "./rdb_cf_options.h"
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namespace myrocks {
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/*
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We need a Column Family (CF) manager. Its functions:
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- create column families (synchronized, don't create the same twice)
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- keep count in each column family.
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= the count is kept on-disk.
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= there are no empty CFs. initially count=1.
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= then, when doing DDL, we increase or decrease it.
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(atomicity is maintained by being in the same WriteBatch with DDLs)
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= if DROP discovers that now count=0, it removes the CF.
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Current state is:
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- CFs are created in a synchronized way. We can't remove them, yet.
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*/
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class Rdb_cf_manager {
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std::map<std::string, rocksdb::ColumnFamilyHandle *> m_cf_name_map;
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std::map<uint32_t, rocksdb::ColumnFamilyHandle *> m_cf_id_map;
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mutable mysql_mutex_t m_mutex;
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static void get_per_index_cf_name(const std::string &db_table_name,
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const char *const index_name,
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std::string *const res);
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Rdb_cf_options *m_cf_options = nullptr;
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public:
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Rdb_cf_manager(const Rdb_cf_manager &) = delete;
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Rdb_cf_manager &operator=(const Rdb_cf_manager &) = delete;
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Rdb_cf_manager() = default;
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static bool is_cf_name_reverse(const char *const name);
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/*
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This is called right after the DB::Open() call. The parameters describe
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column
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families that are present in the database. The first CF is the default CF.
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*/
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void init(Rdb_cf_options *cf_options,
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std::vector<rocksdb::ColumnFamilyHandle *> *const handles);
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void cleanup();
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/*
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Used by CREATE TABLE.
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- cf_name=nullptr means use default column family
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- cf_name=_auto_ means use 'dbname.tablename.indexname'
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*/
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rocksdb::ColumnFamilyHandle *
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get_or_create_cf(rocksdb::DB *const rdb, const char *cf_name,
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const std::string &db_table_name,
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const char *const index_name, bool *const is_automatic);
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/* Used by table open */
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rocksdb::ColumnFamilyHandle *get_cf(const char *cf_name,
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const std::string &db_table_name,
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const char *const index_name,
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bool *const is_automatic) const;
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/* Look up cf by id; used by datadic */
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rocksdb::ColumnFamilyHandle *get_cf(const uint32_t &id) const;
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/* Used to iterate over column families for show status */
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std::vector<std::string> get_cf_names(void) const;
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/* Used to iterate over column families */
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std::vector<rocksdb::ColumnFamilyHandle *> get_all_cf(void) const;
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// void drop_cf(); -- not implemented so far.
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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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m_cf_options->get_cf_options(cf_name, opts);
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}
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};
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} // namespace myrocks
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