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ha_ndbcluster_binlog.cc
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/*
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ha_ndbcluster_glue.h"
#include "ha_ndbcluster.h"
#include "ha_ndbcluster_connection.h"
#include "ndb_local_connection.h"
#include "ndb_thd.h"
#include "ndb_table_guard.h"
#include "ndb_global_schema_lock.h"
#include "ndb_global_schema_lock_guard.h"
#include "ndb_tdc.h"
#include "rpl_injector.h"
#include "rpl_filter.h"
#if MYSQL_VERSION_ID > 50600
#include "rpl_slave.h"
#else
#include "slave.h"
#include "log_event.h"
#endif
#include "ha_ndbcluster_binlog.h"
#include <ndbapi/NdbDictionary.hpp>
#include <ndbapi/ndb_cluster_connection.hpp>
#include "mysqld_thd_manager.h" // Global_THD_manager
extern my_bool opt_ndb_log_orig;
extern my_bool opt_ndb_log_bin;
extern my_bool opt_ndb_log_update_as_write;
extern my_bool opt_ndb_log_updated_only;
extern my_bool opt_ndb_log_binlog_index;
extern my_bool opt_ndb_log_apply_status;
extern ulong opt_ndb_extra_logging;
extern st_ndb_slave_state g_ndb_slave_state;
extern my_bool opt_ndb_log_transaction_id;
extern my_bool log_bin_use_v1_row_events;
bool ndb_log_empty_epochs(void);
void ndb_index_stat_restart();
/*
defines for cluster replication table names
*/
#include "ha_ndbcluster_tables.h"
#include "ndb_dist_priv_util.h"
#include "ndb_anyvalue.h"
#include "ndb_binlog_extra_row_info.h"
#include "ndb_event_data.h"
#include "ndb_schema_object.h"
#include "ndb_schema_dist.h"
#include "ndb_repl_tab.h"
#include "ndb_binlog_thread.h"
/*
Timeout for syncing schema events between
mysql servers, and between mysql server and the binlog
*/
static const int DEFAULT_SYNC_TIMEOUT= 120;
/* Column numbers in the ndb_binlog_index table */
enum Ndb_binlog_index_cols
{
NBICOL_START_POS = 0
,NBICOL_START_FILE = 1
,NBICOL_EPOCH = 2
,NBICOL_NUM_INSERTS = 3
,NBICOL_NUM_UPDATES = 4
,NBICOL_NUM_DELETES = 5
,NBICOL_NUM_SCHEMAOPS = 6
/* Following colums in schema 'v2' */
,NBICOL_ORIG_SERVERID = 7
,NBICOL_ORIG_EPOCH = 8
,NBICOL_GCI = 9
/* Following columns in schema 'v3' */
,NBICOL_NEXT_POS = 10
,NBICOL_NEXT_FILE = 11
};
/*
Flag showing if the ndb binlog should be created, if so == TRUE
FALSE if not
*/
my_bool ndb_binlog_running= FALSE;
static my_bool ndb_binlog_tables_inited= FALSE;
static my_bool ndb_binlog_is_ready= FALSE;
bool
ndb_binlog_is_read_only(void)
{
if(!ndb_binlog_tables_inited)
{
/* the ndb_* system tables not setup yet */
return true;
}
if (ndb_binlog_running && !ndb_binlog_is_ready)
{
/*
The binlog thread is supposed to write to binlog
but not ready (still initializing or has lost connection)
*/
return true;
}
return false;
}
/*
Global reference to the ndb injector thread THD oject
Has one sole purpose, for setting the in_use table member variable
in get_share(...)
*/
extern THD * injector_thd; // Declared in ha_ndbcluster.cc
/*
Global reference to ndb injector thd object.
Used mainly by the binlog index thread, but exposed to the client sql
thread for one reason; to setup the events operations for a table
to enable ndb injector thread receiving events.
Must therefore always be used with a surrounding
native_mutex_lock(&injector_mutex), when doing create/dropEventOperation
*/
static Ndb *injector_ndb= 0;
static Ndb *schema_ndb= 0;
static int ndbcluster_binlog_inited= 0;
/*
Mutex and condition used for interacting between client sql thread
and injector thread
*/
static native_mutex_t injector_mutex;
static native_cond_t injector_cond;
/* NDB Injector thread (used for binlog creation) */
static ulonglong ndb_latest_applied_binlog_epoch= 0;
static ulonglong ndb_latest_handled_binlog_epoch= 0;
static ulonglong ndb_latest_received_binlog_epoch= 0;
NDB_SHARE *ndb_apply_status_share= 0;
NDB_SHARE *ndb_schema_share= 0;
static native_mutex_t ndb_schema_share_mutex;
extern my_bool opt_log_slave_updates;
static my_bool g_ndb_log_slave_updates;
#ifndef DBUG_OFF
static void print_records(TABLE *table, const uchar *record)
{
for (uint j= 0; j < table->s->fields; j++)
{
char buf[40];
int pos= 0;
Field *field= table->field[j];
const uchar* field_ptr= field->ptr - table->record[0] + record;
int pack_len= field->pack_length();
int n= pack_len < 10 ? pack_len : 10;
for (int i= 0; i < n && pos < 20; i++)
{
pos+= sprintf(&buf[pos]," %x", (int) (uchar) field_ptr[i]);
}
buf[pos]= 0;
DBUG_PRINT("info",("[%u]field_ptr[0->%d]: %s", j, n, buf));
}
}
#else
#define print_records(a,b)
#endif
#ifndef DBUG_OFF
static void dbug_print_table(const char *info, TABLE *table)
{
if (table == 0)
{
DBUG_PRINT("info",("%s: (null)", info));
return;
}
DBUG_PRINT("info",
("%s: %s.%s s->fields: %d "
"reclength: %lu rec_buff_length: %u record[0]: 0x%lx "
"record[1]: 0x%lx",
info,
table->s->db.str,
table->s->table_name.str,
table->s->fields,
table->s->reclength,
table->s->rec_buff_length,
(long) table->record[0],
(long) table->record[1]));
for (unsigned int i= 0; i < table->s->fields; i++)
{
Field *f= table->field[i];
DBUG_PRINT("info",
("[%d] \"%s\"(0x%lx:%s%s%s%s%s%s) type: %d pack_length: %d "
"ptr: 0x%lx[+%d] null_bit: %u null_ptr: 0x%lx[+%d]",
i,
f->field_name,
(long) f->flags,
(f->flags & PRI_KEY_FLAG) ? "pri" : "attr",
(f->flags & NOT_NULL_FLAG) ? "" : ",nullable",
(f->flags & UNSIGNED_FLAG) ? ",unsigned" : ",signed",
(f->flags & ZEROFILL_FLAG) ? ",zerofill" : "",
(f->flags & BLOB_FLAG) ? ",blob" : "",
(f->flags & BINARY_FLAG) ? ",binary" : "",
f->real_type(),
f->pack_length(),
(long) f->ptr, (int) (f->ptr - table->record[0]),
f->null_bit,
(long) f->null_offset(0),
(int) f->null_offset()));
if (f->type() == MYSQL_TYPE_BIT)
{
Field_bit *g= (Field_bit*) f;
DBUG_PRINT("MYSQL_TYPE_BIT",("field_length: %d bit_ptr: 0x%lx[+%d] "
"bit_ofs: %d bit_len: %u",
g->field_length, (long) g->bit_ptr,
(int) ((uchar*) g->bit_ptr -
table->record[0]),
g->bit_ofs, g->bit_len));
}
}
}
#else
#define dbug_print_table(a,b)
#endif
static void run_query(THD *thd, char *buf, char *end,
const int *no_print_error)
{
/*
NOTE! Don't use this function for new implementation, backward
compat. only
*/
Ndb_local_connection mysqld(thd);
/*
Run the query, suppress some errors from being printed
to log and ignore any error returned
*/
(void)mysqld.raw_run_query(buf, (end - buf),
no_print_error);
}
static void
ndb_binlog_close_shadow_table(NDB_SHARE *share)
{
DBUG_ENTER("ndb_binlog_close_shadow_table");
Ndb_event_data *event_data= share->event_data;
if (event_data)
{
delete event_data;
share->event_data= 0;
}
DBUG_VOID_RETURN;
}
/*
Open a shadow table for the table given in share.
- The shadow table is (mainly) used when an event is
received from the data nodes which need to be written
to the binlog injector.
*/
static int
ndb_binlog_open_shadow_table(THD *thd, NDB_SHARE *share)
{
int error;
DBUG_ASSERT(share->event_data == 0);
Ndb_event_data *event_data= share->event_data= new Ndb_event_data(share);
DBUG_ENTER("ndb_binlog_open_shadow_table");
MEM_ROOT **root_ptr= my_pthread_get_THR_MALLOC();
MEM_ROOT *old_root= *root_ptr;
init_sql_alloc(PSI_INSTRUMENT_ME, &event_data->mem_root, 1024, 0);
*root_ptr= &event_data->mem_root;
TABLE_SHARE *shadow_table_share=
(TABLE_SHARE*)alloc_root(&event_data->mem_root, sizeof(TABLE_SHARE));
TABLE *shadow_table=
(TABLE*)alloc_root(&event_data->mem_root, sizeof(TABLE));
init_tmp_table_share(thd, shadow_table_share,
share->db, 0,
share->table_name,
share->key);
if ((error= open_table_def(thd, shadow_table_share, 0)) ||
(error= open_table_from_share(thd, shadow_table_share, "", 0,
(uint) (OPEN_FRM_FILE_ONLY | DELAYED_OPEN | READ_ALL),
0, shadow_table,
false
)))
{
DBUG_PRINT("error", ("failed to open shadow table, error: %d my_errno: %d",
error, my_errno));
free_table_share(shadow_table_share);
delete event_data;
share->event_data= 0;
*root_ptr= old_root;
DBUG_RETURN(error);
}
event_data->shadow_table= shadow_table;
mysql_mutex_lock(&LOCK_open);
assign_new_table_id(shadow_table_share);
mysql_mutex_unlock(&LOCK_open);
shadow_table->in_use= injector_thd;
shadow_table->s->db.str= share->db;
shadow_table->s->db.length= strlen(share->db);
shadow_table->s->table_name.str= share->table_name;
shadow_table->s->table_name.length= strlen(share->table_name);
/* We can't use 'use_all_columns()' as the file object is not setup yet */
shadow_table->column_bitmaps_set_no_signal(&shadow_table->s->all_set,
&shadow_table->s->all_set);
if (shadow_table->s->primary_key == MAX_KEY)
share->flags|= NSF_HIDDEN_PK;
if (shadow_table->s->blob_fields != 0)
share->flags|= NSF_BLOB_FLAG;
#ifndef DBUG_OFF
dbug_print_table("table", shadow_table);
#endif
*root_ptr= old_root;
DBUG_RETURN(0);
}
/*
Initialize the binlog part of the NDB_SHARE
*/
int ndbcluster_binlog_init_share(THD *thd, NDB_SHARE *share, TABLE *_table)
{
DBUG_ENTER("ndbcluster_binlog_init_share");
if (!share->need_events(ndb_binlog_running))
{
if (_table)
{
if (_table->s->primary_key == MAX_KEY)
share->flags|= NSF_HIDDEN_PK;
if (_table->s->blob_fields != 0)
share->flags|= NSF_BLOB_FLAG;
}
else
{
share->flags|= NSF_NO_BINLOG;
}
DBUG_RETURN(0);
}
DBUG_RETURN(ndb_binlog_open_shadow_table(thd, share));
}
static int
get_ndb_blobs_value(TABLE* table, NdbValue* value_array,
uchar*& buffer, uint& buffer_size,
my_ptrdiff_t ptrdiff)
{
DBUG_ENTER("get_ndb_blobs_value");
// Field has no field number so cannot use TABLE blob_field
// Loop twice, first only counting total buffer size
for (int loop= 0; loop <= 1; loop++)
{
uint32 offset= 0;
for (uint i= 0; i < table->s->fields; i++)
{
Field *field= table->field[i];
NdbValue value= value_array[i];
if (! (field->flags & BLOB_FLAG))
continue;
if (value.blob == NULL)
{
DBUG_PRINT("info",("[%u] skipped", i));
continue;
}
Field_blob *field_blob= (Field_blob *)field;
NdbBlob *ndb_blob= value.blob;
int isNull;
if (ndb_blob->getNull(isNull) != 0)
DBUG_RETURN(-1);
if (isNull == 0) {
Uint64 len64= 0;
if (ndb_blob->getLength(len64) != 0)
DBUG_RETURN(-1);
// Align to Uint64
uint32 size= Uint32(len64);
if (size % 8 != 0)
size+= 8 - size % 8;
if (loop == 1)
{
uchar *buf= buffer + offset;
uint32 len= 0xffffffff; // Max uint32
if (ndb_blob->readData(buf, len) != 0)
DBUG_RETURN(-1);
DBUG_PRINT("info", ("[%u] offset: %u buf: 0x%lx len=%u [ptrdiff=%d]",
i, offset, (long) buf, len, (int)ptrdiff));
DBUG_ASSERT(len == len64);
// Ugly hack assumes only ptr needs to be changed
field_blob->set_ptr_offset(ptrdiff, len, buf);
}
offset+= size;
}
else if (loop == 1) // undefined or null
{
// have to set length even in this case
uchar *buf= buffer + offset; // or maybe NULL
uint32 len= 0;
field_blob->set_ptr_offset(ptrdiff, len, buf);
DBUG_PRINT("info", ("[%u] isNull=%d", i, isNull));
}
}
if (loop == 0 && offset > buffer_size)
{
my_free(buffer);
buffer_size= 0;
DBUG_PRINT("info", ("allocate blobs buffer size %u", offset));
buffer= (uchar*) my_malloc(PSI_INSTRUMENT_ME, offset, MYF(MY_WME));
if (buffer == NULL)
{
sql_print_error("get_ndb_blobs_value: my_malloc(%u) failed", offset);
DBUG_RETURN(-1);
}
buffer_size= offset;
}
}
DBUG_RETURN(0);
}
/*****************************************************************
functions called from master sql client threads
****************************************************************/
/*
called in mysql_show_binlog_events and reset_logs to make sure we wait for
all events originating from this mysql server to arrive in the binlog
Wait for the last epoch in which the last transaction is a part of.
Wait a maximum of 30 seconds.
*/
static void ndbcluster_binlog_wait(THD *thd)
{
if (ndb_binlog_running)
{
DBUG_ENTER("ndbcluster_binlog_wait");
ulonglong wait_epoch= ndb_get_latest_trans_gci();
/*
cluster not connected or no transactions done
so nothing to wait for
*/
if (!wait_epoch)
DBUG_VOID_RETURN;
/*
Binlog Injector should not wait for itself
*/
if (thd &&
thd->system_thread == SYSTEM_THREAD_NDBCLUSTER_BINLOG)
DBUG_VOID_RETURN;
const char *save_info= thd ? thd->proc_info : 0;
int count= 30;
if (thd)
thd->proc_info= "Waiting for ndbcluster binlog update to "
"reach current position";
const Uint64 start_handled_epoch = ndb_latest_handled_binlog_epoch;
native_mutex_lock(&injector_mutex);
while (!(thd && thd->killed) && count && ndb_binlog_running &&
(ndb_latest_handled_binlog_epoch == 0 ||
ndb_latest_handled_binlog_epoch < wait_epoch))
{
count--;
struct timespec abstime;
set_timespec(&abstime, 1);
native_cond_timedwait(&injector_cond, &injector_mutex, &abstime);
}
native_mutex_unlock(&injector_mutex);
if (count == 0)
{
sql_print_warning("NDB: Thread id %u timed out (30s) waiting for epoch %u/%u "
"to be handled. Progress : %u/%u -> %u/%u.",
thd->thread_id(),
Uint32((wait_epoch >> 32) & 0xffffffff),
Uint32(wait_epoch & 0xffffffff),
Uint32((start_handled_epoch >> 32) & 0xffffffff),
Uint32(start_handled_epoch & 0xffffffff),
Uint32((ndb_latest_handled_binlog_epoch >> 32) & 0xffffffff),
Uint32(ndb_latest_handled_binlog_epoch & 0xffffffff));
}
if (thd)
thd->proc_info= save_info;
DBUG_VOID_RETURN;
}
}
/*
Called from MYSQL_BIN_LOG::reset_logs in log.cc when binlog is emptied
*/
static int ndbcluster_reset_logs(THD *thd)
{
if (!ndb_binlog_running)
return 0;
/* only reset master should reset logs */
if (!((thd->lex->sql_command == SQLCOM_RESET) &&
(thd->lex->type & REFRESH_MASTER)))
return 0;
DBUG_ENTER("ndbcluster_reset_logs");
/*
Wait for all events originating from this mysql server has
reached the binlog before continuing to reset
*/
ndbcluster_binlog_wait(thd);
/*
Truncate mysql.ndb_binlog_index table, if table does not
exist ignore the error as it is a "consistent" behavior
*/
Ndb_local_connection mysqld(thd);
const bool ignore_no_such_table = true;
if(mysqld.truncate_table(STRING_WITH_LEN("mysql"),
STRING_WITH_LEN("ndb_binlog_index"),
ignore_no_such_table))
{
// Failed to truncate table
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Setup THD object
'Inspired' from ha_ndbcluster.cc : ndb_util_thread_func
*/
THD *
ndb_create_thd(char * stackptr)
{
DBUG_ENTER("ndb_create_thd");
THD * thd= new THD; /* note that contructor of THD uses DBUG_ */
if (thd == 0)
{
DBUG_RETURN(0);
}
THD_CHECK_SENTRY(thd);
thd->thread_stack= stackptr; /* remember where our stack is */
if (thd->store_globals())
{
delete thd;
DBUG_RETURN(0);
}
thd->init_for_queries();
thd_set_command(thd, COM_DAEMON);
thd->system_thread= SYSTEM_THREAD_NDBCLUSTER_BINLOG;
#ifndef NDB_THD_HAS_NO_VERSION
thd->version= refresh_version;
#endif
thd->client_capabilities= 0;
thd->lex->start_transaction_opt= 0;
thd->security_context()->skip_grants();
CHARSET_INFO *charset_connection= get_charset_by_csname("utf8",
MY_CS_PRIMARY,
MYF(MY_WME));
thd->variables.character_set_client= charset_connection;
thd->variables.character_set_results= charset_connection;
thd->variables.collation_connection= charset_connection;
thd->update_charset();
DBUG_RETURN(thd);
}
/*
Called from MYSQL_BIN_LOG::purge_logs in log.cc when the binlog "file"
is removed
*/
static int
ndbcluster_binlog_index_purge_file(THD *passed_thd, const char *file)
{
int stack_base = 0;
int error = 0;
DBUG_ENTER("ndbcluster_binlog_index_purge_file");
DBUG_PRINT("enter", ("file: %s", file));
if (!ndb_binlog_running || (passed_thd && passed_thd->slave_thread))
DBUG_RETURN(0);
/**
* This function cannot safely reuse the passed thd object
* due to the variety of places from which it is called.
* new/delete one...yuck!
*/
THD* my_thd;
if ((my_thd = ndb_create_thd((char*)&stack_base) /* stack ptr */) == 0)
{
/**
* TODO return proper error code here,
* BUT! return code is not (currently) checked in
* log.cc : purge_index_entry() so we settle for warning printout
* Will sql_print_warning fail with no thd?
*/
sql_print_warning("NDB: Unable to purge "
NDB_REP_DB "." NDB_REP_TABLE
" File=%s (failed to setup thd)", file);
DBUG_RETURN(0);
}
/*
delete rows from mysql.ndb_binlog_index table for the given
filename, if table does not exist ignore the error as it
is a "consistent" behavior
*/
Ndb_local_connection mysqld(my_thd);
const bool ignore_no_such_table = true;
if(mysqld.delete_rows(STRING_WITH_LEN("mysql"),
STRING_WITH_LEN("ndb_binlog_index"),
ignore_no_such_table,
"File='", file, "'", NULL))
{
// Failed to delete rows from table
error = 1;
}
delete my_thd;
if (passed_thd)
{
/* Relink passed THD with this thread */
passed_thd->store_globals();
}
DBUG_RETURN(error);
}
// Determine if privilege tables are distributed, ie. stored in NDB
bool
Ndb_dist_priv_util::priv_tables_are_in_ndb(THD* thd)
{
bool distributed= false;
Ndb_dist_priv_util dist_priv;
DBUG_ENTER("ndbcluster_distributed_privileges");
Ndb *ndb= check_ndb_in_thd(thd);
if (!ndb)
DBUG_RETURN(false); // MAGNUS, error message?
if (ndb->setDatabaseName(dist_priv.database()) != 0)
DBUG_RETURN(false);
const char* table_name;
while((table_name= dist_priv.iter_next_table()))
{
DBUG_PRINT("info", ("table_name: %s", table_name));
Ndb_table_guard ndbtab_g(ndb->getDictionary(), table_name);
const NDBTAB *ndbtab= ndbtab_g.get_table();
if (ndbtab)
{
distributed= true;
}
else if (distributed)
{
sql_print_error("NDB: Inconsistency detected in distributed "
"privilege tables. Table '%s.%s' is not distributed",
dist_priv.database(), table_name);
DBUG_RETURN(false);
}
}
DBUG_RETURN(distributed);
}
/*
ndbcluster_binlog_log_query
- callback function installed in handlerton->binlog_log_query
- called by MySQL Server in places where no other handlerton
function exists which can be used to notify about changes
- used by ndbcluster to detect when
-- databases are created or altered
-- privilege tables have been modified
*/
static void
ndbcluster_binlog_log_query(handlerton *hton, THD *thd,
enum_binlog_command binlog_command,
const char *query, uint query_length,
const char *db, const char *table_name)
{
DBUG_ENTER("ndbcluster_binlog_log_query");
DBUG_PRINT("enter", ("db: %s table_name: %s query: %s",
db, table_name, query));
enum SCHEMA_OP_TYPE type;
/* Use random table_id and table_version */
const uint32 table_id = (uint32)rand();
const uint32 table_version = (uint32)rand();
switch (binlog_command)
{
case LOGCOM_CREATE_DB:
DBUG_PRINT("info", ("New database '%s' created", db));
type= SOT_CREATE_DB;
break;
case LOGCOM_ALTER_DB:
DBUG_PRINT("info", ("The database '%s' was altered", db));
type= SOT_ALTER_DB;
break;
case LOGCOM_ACL_NOTIFY:
DBUG_PRINT("info", ("Privilege tables have been modified"));
type= SOT_GRANT;
if (!Ndb_dist_priv_util::priv_tables_are_in_ndb(thd))
{
DBUG_VOID_RETURN;
}
/*
NOTE! Grant statements with db set to NULL is very rare but
may be provoked by for example dropping the currently selected
database. Since ndbcluster_log_schema_op does not allow
db to be NULL(can't create a key for the ndb_schem_object nor
writeNULL to ndb_schema), the situation is salvaged by setting db
to the constant string "mysql" which should work in most cases.
Interestingly enough this "hack" has the effect that grant statements
are written to the remote binlog in same format as if db would have
been NULL.
*/
if (!db)
db = "mysql";
break;
default:
DBUG_PRINT("info", ("Ignoring binlog_log_query notification"));
DBUG_VOID_RETURN;
break;
}
ndbcluster_log_schema_op(thd, query, query_length,
db, table_name, table_id, table_version, type,
NULL, NULL);
DBUG_VOID_RETURN;
}
extern void ndb_util_thread_stop(void);
// Instantiate Ndb_binlog_thread component
static Ndb_binlog_thread ndb_binlog_thread;
/*
End use of the NDB Cluster binlog
- wait for binlog thread to shutdown
*/
int ndbcluster_binlog_end(THD *thd)
{
DBUG_ENTER("ndbcluster_binlog_end");
// Stop ndb_util_thread first since it uses THD(which
// implicitly depend on binlog)
ndb_util_thread_stop();
if (ndbcluster_binlog_inited)
{
ndbcluster_binlog_inited= 0;
ndb_binlog_thread.stop();
ndb_binlog_thread.deinit();
native_mutex_destroy(&injector_mutex);
native_cond_destroy(&injector_cond);
native_mutex_destroy(&ndb_schema_share_mutex);
}
DBUG_RETURN(0);
}
/*****************************************************************
functions called from slave sql client threads
****************************************************************/
static void ndbcluster_reset_slave(THD *thd)
{
int error = 0;
if (!ndb_binlog_running)
return;
DBUG_ENTER("ndbcluster_reset_slave");
/*
delete all rows from mysql.ndb_apply_status table
- if table does not exist ignore the error as it
is a consistent behavior
*/
Ndb_local_connection mysqld(thd);
const bool ignore_no_such_table = true;
if(mysqld.delete_rows(STRING_WITH_LEN("mysql"),
STRING_WITH_LEN("ndb_apply_status"),
ignore_no_such_table,
NULL))
{
// Failed to delete rows from table
error = 1;
}
g_ndb_slave_state.atResetSlave();
// pending fix for bug#59844 will make this function return int
DBUG_VOID_RETURN;
}
/*
Initialize the binlog part of the ndb handlerton
*/
/**
Upon the sql command flush logs, we need to ensure that all outstanding
ndb data to be logged has made it to the binary log to get a deterministic
behavior on the rotation of the log. Do nothing if the ndbcluster_flush_logs
is caused by binlog group commit during flush stage.
@param hton NDB handlerton.
@param binlog_group_flush true if we got invoked by binlog group
commit during flush stage, false in other cases.
@return false Success always.
*/
static bool ndbcluster_flush_logs(handlerton *hton, bool binlog_group_flush)
{
if (!binlog_group_flush)
ndbcluster_binlog_wait(current_thd);
return FALSE;
}
static int ndbcluster_binlog_func(handlerton *hton, THD *thd,
enum_binlog_func fn,
void *arg)
{
DBUG_ENTER("ndbcluster_binlog_func");
int res= 0;
switch(fn)
{
case BFN_RESET_LOGS:
res= ndbcluster_reset_logs(thd);
break;
case BFN_RESET_SLAVE:
ndbcluster_reset_slave(thd);
break;
case BFN_BINLOG_WAIT:
ndbcluster_binlog_wait(thd);
break;
case BFN_BINLOG_END:
res= ndbcluster_binlog_end(thd);
break;
case BFN_BINLOG_PURGE_FILE:
res= ndbcluster_binlog_index_purge_file(thd, (const char *)arg);
break;
}
DBUG_RETURN(res);
}
void ndbcluster_binlog_init(handlerton* h)
{
h->flush_logs= ndbcluster_flush_logs;
h->binlog_func= ndbcluster_binlog_func;
h->binlog_log_query= ndbcluster_binlog_log_query;
}
/*
Convert db and table name into a key to use for searching
the ndbcluster_open_tables hash
*/
static size_t
ndb_open_tables__create_key(char* key_buf, size_t key_buf_length,
const char* db, size_t db_length,
const char* table, size_t table_length)
{
size_t key_length = my_snprintf(key_buf, key_buf_length,
"./%*s/%*s", db_length, db,
table_length, table) - 1;
assert(key_length > 0);
assert(key_length < key_buf_length);
return key_length;
}
/*
Check if table with given name is open, ie. is
in ndbcluster_open_tables hash
*/
static bool
ndb_open_tables__is_table_open(const char* db, size_t db_length,
const char* table, size_t table_length)
{
char key[FN_REFLEN + 1];
size_t key_length = ndb_open_tables__create_key(key, sizeof(key),
db, db_length,
table, table_length);
DBUG_ENTER("ndb_open_tables__is_table_open");
DBUG_PRINT("enter", ("db: '%s', table: '%s', key: '%s'",
db, table, key));
native_mutex_lock(&ndbcluster_mutex);
bool result = my_hash_search(&ndbcluster_open_tables,
(const uchar*)key,
key_length) != NULL;
native_mutex_unlock(&ndbcluster_mutex);
DBUG_PRINT("exit", ("result: %d", result));
DBUG_RETURN(result);
}
static bool
ndbcluster_check_ndb_schema_share()
{
return ndb_open_tables__is_table_open(STRING_WITH_LEN("mysql"),
STRING_WITH_LEN("ndb_schema"));
}
static bool
ndbcluster_check_ndb_apply_status_share()
{
return ndb_open_tables__is_table_open(STRING_WITH_LEN("mysql"),
STRING_WITH_LEN("ndb_apply_status"));
}
static bool
create_cluster_sys_table(THD *thd, const char* db, size_t db_length,
const char* table, size_t table_length,
const char* create_definitions,
const char* create_options)
{
if (ndb_open_tables__is_table_open(db, db_length, table, table_length))
return false;
if (g_ndb_cluster_connection->get_no_ready() <= 0)
return false;
if (opt_ndb_extra_logging)
sql_print_information("NDB: Creating %s.%s", db, table);
Ndb_local_connection mysqld(thd);
/*
Check if table exists in MySQL "dictionary"(i.e on disk)
if so, remove it since there is none in Ndb
*/
{
char path[FN_REFLEN + 1];
build_table_filename(path, sizeof(path) - 1,
db, table, reg_ext, 0);
if (my_delete(path, MYF(0)) == 0)
{
/*
The .frm file existed and was deleted from disk.
It's possible that someone has tried to use it and thus
it might have been inserted in the table definition cache.
It must be flushed to avoid that it exist only in the
table definition cache.
*/
if (opt_ndb_extra_logging)