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/*****************************************************************************
Copyright (C) 2013, 2014 Facebook, Inc. All Rights Reserved.
Copyright (C) 2014, 2017, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
#ifndef btr0defragment_h
#define btr0defragment_h
#include "btr0pcur.h"
/* Max number of pages to consider at once during defragmentation. */
#define BTR_DEFRAGMENT_MAX_N_PAGES 32
/** stats in btr_defragment */
extern ulint btr_defragment_compression_failures;
extern ulint btr_defragment_failures;
extern ulint btr_defragment_count;
/** Item in the work queue for btr_degrament_thread. */
struct btr_defragment_item_t
{
btr_pcur_t* pcur; /* persistent cursor where
btr_defragment_n_pages should start */
os_event_t event; /* if not null, signal after work
is done */
bool removed; /* Mark an item as removed */
ulonglong last_processed; /* timestamp of last time this index
is processed by defragment thread */
btr_defragment_item_t(btr_pcur_t* pcur, os_event_t event);
~btr_defragment_item_t();
};
/******************************************************************//**
Initialize defragmentation. */
void
btr_defragment_init(void);
/******************************************************************//**
Shutdown defragmentation. */
void
btr_defragment_shutdown();
/******************************************************************//**
Check whether the given index is in btr_defragment_wq. */
bool
btr_defragment_find_index(
dict_index_t* index); /*!< Index to find. */
/******************************************************************//**
Add an index to btr_defragment_wq. Return a pointer to os_event if this
is a synchronized defragmentation. */
os_event_t
btr_defragment_add_index(
dict_index_t* index, /*!< index to be added */
bool async, /*!< whether this is an async
defragmentation */
dberr_t* err); /*!< out: error code */
/******************************************************************//**
When table is dropped, this function is called to mark a table as removed in
btr_efragment_wq. The difference between this function and the remove_index
function is this will not NULL the event. */
void
btr_defragment_remove_table(
dict_table_t* table); /*!< Index to be removed. */
/******************************************************************//**
Mark an index as removed from btr_defragment_wq. */
void
btr_defragment_remove_index(
dict_index_t* index); /*!< Index to be removed. */
/*********************************************************************//**
Check whether we should save defragmentation statistics to persistent storage.*/
UNIV_INTERN
void
btr_defragment_save_defrag_stats_if_needed(
dict_index_t* index); /*!< in: index */
/** Merge consecutive b-tree pages into fewer pages to defragment indexes */
extern "C" UNIV_INTERN
os_thread_ret_t
DECLARE_THREAD(btr_defragment_thread)(void*);
/** Whether btr_defragment_thread is active */
extern bool btr_defragment_thread_active;
#endif
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