368 lines
10 KiB
C++
368 lines
10 KiB
C++
/* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; version 2 of the
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License.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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., 51 Franklin St, Fifth Floor, Boston, MA
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02110-1301 USA */
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#ifndef RPL_GTID_PERSIST_H_
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#define RPL_GTID_PERSIST_H_
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#include "my_global.h"
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#include "rpl_table_access.h" // System_table_access
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#include "sql_class.h" // Open_tables_backup
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#include <string>
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class Gtid_table_access_context : public System_table_access
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{
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public:
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static const LEX_STRING DB_NAME;
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static const LEX_STRING TABLE_NAME;
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Gtid_table_access_context() : m_drop_thd_object(NULL) { };
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virtual ~Gtid_table_access_context() { };
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/**
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Initialize the gtid_executed table access context as following:
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- Create a new THD if current_thd is NULL
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- Disable binlog temporarily if we are going to modify the table
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- Open and lock a table.
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@param[in/out] thd Thread requesting to open the table
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@param lock_type How to lock the table
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@param[out] table We will store the open table here
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@return
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@retval TRUE failed
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@retval FALSE success
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*/
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bool init(THD **thd, TABLE **table, bool is_write);
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/**
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De-initialize the gtid_executed table access context as following:
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- Close the table
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- Reenable binlog if needed
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- Destroy the created THD if needed.
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@param thd Thread requesting to close the table
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@param table Table to be closed
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@param error If there was an error while updating the table
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@param need_commit Need to commit current transaction if it is true
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@return
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@retval true failed
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@retval false success
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*/
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bool deinit(THD *thd, TABLE *table, bool error, bool need_commit);
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/**
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Prepares before opening table.
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- set flags
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@param[in] thd Thread requesting to open the table
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*/
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void before_open(THD* thd);
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/**
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Creates a new thread in the bootstrap process or in the mysqld startup,
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a thread is created in order to be able to access a table. And reset a
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new "statement".
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@return
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@retval THD* Pointer to thread structure
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*/
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THD *create_thd();
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void drop_thd(THD* thd);
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private:
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/* Pointer to new created THD. */
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THD *m_drop_thd_object;
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/* Modify the table if it is true. */
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bool m_is_write;
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/* Save the lock info. */
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Open_tables_backup m_backup;
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/* Save binlog options. */
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ulonglong m_tmp_disable_binlog__save_options;
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/* Prevent user from invoking default assignment function. */
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Gtid_table_access_context &operator=(const Gtid_table_access_context &info);
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/* Prevent user from invoking default constructor function. */
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Gtid_table_access_context(const Gtid_table_access_context &info);
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};
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class Gtid_table_persistor
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{
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public:
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static const uint number_fields= 3;
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Gtid_table_persistor()
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{
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m_count.atomic_set(0);
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};
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virtual ~Gtid_table_persistor() { };
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/**
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Insert the gtid into table.
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@param thd Thread requesting to save gtid into the table
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@param gtid holds the sidno and the gno.
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@retval
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0 OK
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@retval
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1 The table was not found.
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@retval
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-1 Error
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*/
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int save(THD *thd, const Gtid *gtid);
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/**
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Insert the gtid set into table.
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@param gtid_set contains a set of gtid, which holds
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the sidno and the gno.
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@retval
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0 OK
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@retval
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-1 Error
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*/
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int save(const Gtid_set *gtid_set);
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/**
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Delete all rows from the table.
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@param thd Thread requesting to reset the table
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@retval
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0 OK
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@retval
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1 The table was not found.
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@retval
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-1 Error
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*/
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int reset(THD *thd);
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/**
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Fetch gtids from gtid_executed table and store them into
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gtid_executed set.
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@param[out] gtid_set store gtids fetched from the gtid_executed table.
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@retval
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0 OK
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@retval
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1 The table was not found.
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@retval
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-1 Error
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*/
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int fetch_gtids(Gtid_set *gtid_set);
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/**
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Compress the gtid_executed table completely by employing one
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or more transactions.
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@param thd Thread requesting to compress the table
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@retval
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0 OK
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@retval
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1 The table was not found.
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@retval
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-1 Error
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*/
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int compress(THD *thd);
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/**
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Push a warning to client if user is modifying the gtid_executed
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table explicitly by a non-XA transaction. Push an error to client
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if user is modifying it explicitly by a XA transaction.
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@param thd Thread requesting to access the table
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@param table The table is being accessed.
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@retval 0 No warning or error was pushed to the client.
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@retval 1 Push a warning to client.
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@retval 2 Push an error to client.
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*/
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int warn_or_err_on_explicit_modification(THD *thd, TABLE_LIST *table)
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{
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DBUG_ENTER("Gtid_table_persistor::warn_or_err_on_explicit_modification");
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if (!thd->is_operating_gtid_table_implicitly &&
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table->lock_type >= TL_WRITE_ALLOW_WRITE &&
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!strcmp(table->table_name, Gtid_table_access_context::TABLE_NAME.str))
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{
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if (thd->get_transaction()->xid_state()->has_state(XID_STATE::XA_ACTIVE))
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{
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/*
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Push an error to client if user is modifying the gtid_executed
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table explicitly by a XA transaction.
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*/
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thd->raise_error_printf(ER_ERROR_ON_MODIFYING_GTID_EXECUTED_TABLE,
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table->table_name);
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DBUG_RETURN(2);
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}
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else
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{
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/*
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Push a warning to client if user is modifying the gtid_executed
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table explicitly by a non-XA transaction.
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*/
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thd->raise_warning_printf(ER_WARN_ON_MODIFYING_GTID_EXECUTED_TABLE,
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table->table_name);
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DBUG_RETURN(1);
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}
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}
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DBUG_RETURN(0);
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}
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private:
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/* Count the append size of the table */
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Atomic_int64 m_count;
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/**
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Compress the gtid_executed table, read each row by the
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PK(sid, gno_start) in increasing order, compress the first
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consecutive range of gtids within a single transaction.
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@param thd Thread requesting to compress the table
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@param[out] is_complete True if the gtid_executed table is
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compressd completely.
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@retval
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0 OK
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@retval
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1 The table was not found.
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@retval
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-1 Error
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*/
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int compress_in_single_transaction(THD *thd, bool &is_complete);
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/**
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Read each row by the PK(sid, gno_start) in increasing order,
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compress the first consecutive range of gtids.
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For example,
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1 1
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2 2
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3 3
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6 6
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7 7
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8 8
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After the compression, the gtids in the table is compressed as following:
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1 3
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6 6
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7 7
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8 8
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@param table Reference to a table object.
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@param[out] is_complete True if the gtid_executed table
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is compressd completely.
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@return
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@retval 0 OK.
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@retval -1 Error.
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*/
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int compress_first_consecutive_range(TABLE *table, bool &is_complete);
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/**
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Fill a gtid interval into fields of the gtid_executed table.
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@param fields Reference to table fileds.
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@param sid The source id of the gtid interval.
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@param gno_star The first GNO of the gtid interval.
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@param gno_end The last GNO of the gtid interval.
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@return
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@retval 0 OK.
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@retval -1 Error.
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*/
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int fill_fields(Field **fields, const char *sid,
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rpl_gno gno_start, rpl_gno gno_end);
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/**
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Write a gtid interval into the gtid_executed table.
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@param table Reference to a table object.
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@param sid The source id of the gtid interval.
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@param gno_star The first GNO of the gtid interval.
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@param gno_end The last GNO of the gtid interval.
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@return
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@retval 0 OK.
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@retval -1 Error.
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*/
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int write_row(TABLE *table, const char *sid,
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rpl_gno gno_start, rpl_gno gno_end);
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/**
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Update a gtid interval in the gtid_executed table.
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- locate the gtid interval by primary key (sid, gno_start)
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to update it with the new_gno_end.
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@param table Reference to a table object.
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@param sid The source id of the gtid interval.
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@param gno_star The first GNO of the gtid interval.
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@param new_gno_end The new last GNO of the gtid interval.
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@return
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@retval 0 OK.
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@retval -1 Error.
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*/
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int update_row(TABLE *table, const char *sid,
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rpl_gno gno_start, rpl_gno new_gno_end);
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/**
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Delete all rows in the gtid_executed table.
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@param table Reference to a table object.
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@return
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@retval 0 OK.
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@retval -1 Error.
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*/
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int delete_all(TABLE *table);
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/**
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Encode the current row fetched from the table into gtid text.
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@param table Reference to a table object.
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@retval Return the encoded gtid text.
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*/
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std::string encode_gtid_text(TABLE *table);
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/**
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Get gtid interval from the the current row of the table.
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@param table Reference to a table object.
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@param sid[out] The source id of the gtid interval.
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@param gno_star[out] The first GNO of the gtid interval.
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@param gno_end[out] The last GNO of the gtid interval.
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*/
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void get_gtid_interval(TABLE *table, std::string &sid,
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rpl_gno &gno_start, rpl_gno &gno_end);
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/**
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Insert the gtid set into table.
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@param table The gtid_executed table.
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@param gtid_executed Contains a set of gtid, which holds
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the sidno and the gno.
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@retval
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0 OK
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@retval
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-1 Error
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*/
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int save(TABLE *table, const Gtid_set *gtid_set);
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/* Prevent user from invoking default assignment function. */
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Gtid_table_persistor &operator=(const Gtid_table_persistor &info);
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/* Prevent user from invoking default constructor function. */
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Gtid_table_persistor(const Gtid_table_persistor &info);
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};
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extern Gtid_table_persistor *gtid_table_persistor;
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void create_compress_gtid_table_thread();
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void terminate_compress_gtid_table_thread();
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#endif /* RPL_GTID_PERSIST_H_ */
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