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fixed up lock counting code - Monty's suggestions 

updated manual about table lock counter
fixed coredump in DROP DATABASE with long bogus name by non-root user
fixed bug in handling STOP immediately after ROTATE
added test case for buffer overrun on DROP DATABASE by non-root user
added test case for the STOP bug in replication


Docs/manual.texi:
  updates for Table_locks_immediate and Table_locks_waited
include/thr_lock.h:
  fixes suggested by Monty to lock counts
mysql-test/r/status.result:
  clean up of result for changes in the test case
mysql-test/t/status.test:
  make it produce the same results if the had been some activity on the server already
mysys/thr_lock.c:
  fixes suggested by Monty
sql/mysqld.cc:
  fixes suggested by Monty
sql/slave.cc:
  fixed bug in processing STOP event after rotate
sql/sql_base.cc:
  fixes suggested by Monty
sql/sql_parse.cc:
  fixed coredump in drop database with long name by a non-root user
sql/sql_repl.cc:
  better status message
parent c632e29c
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Showing with 129 additions and 68 deletions
Docs/manual.texi
View file @ e3ad443d
......@@ -20285,59 +20285,64 @@ The following columns are returned:
below, though the format and numbers probably differ:
@example
+--------------------------+------------+
| Variable_name | Value |
+--------------------------+------------+
| Aborted_clients | 0 |
| Aborted_connects | 0 |
| Bytes_received | 142160923 |
| Bytes_sent | 1161910370 |
| Connections | 30022 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_tables | 8988 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 1 |
| Handler_delete | 462604 |
| Handler_read_first | 95882 |
| Handler_read_key | 27681068 |
| Handler_read_next | 265008218 |
| Handler_read_prev | 3022500 |
| Handler_read_rnd | 36900998 |
| Handler_read_rnd_next | 252097176 |
| Handler_update | 16945404 |
| Handler_write | 66826676 |
| Key_blocks_used | 14955 |
| Key_read_requests | 90131960 |
| Key_reads | 163268 |
| Key_write_requests | 7573912 |
| Key_writes | 3780151 |
| Max_used_connections | 0 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 0 |
| Open_files | 0 |
| Open_streams | 0 |
| Opened_tables | 44598 |
| Questions | 1866024 |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
| Select_range | 68187 |
| Select_range_check | 0 |
| Select_scan | 31440 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 0 |
| Sort_range | 0 |
| Sort_rows | 36650500 |
| Sort_scan | 5298 |
| Threads_cached | 0 |
| Threads_connected | 1 |
| Threads_created | 30022 |
| Threads_running | 1 |
| Uptime | 39613 |
+--------------------------+------------+
+--------------------------+--------+
| Variable_name | Value |
+--------------------------+--------+
| Aborted_clients | 0 |
| Aborted_connects | 0 |
| Bytes_received | 629539 |
| Bytes_sent | 736394 |
| Connections | 62 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_tables | 0 |
| Created_tmp_files | 0 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 1 |
| Handler_delete | 0 |
| Handler_read_first | 1 |
| Handler_read_key | 9201 |
| Handler_read_next | 0 |
| Handler_read_prev | 0 |
| Handler_read_rnd | 0 |
| Handler_read_rnd_next | 45 |
| Handler_update | 5998 |
| Handler_write | 0 |
| Key_blocks_used | 407 |
| Key_read_requests | 27683 |
| Key_reads | 407 |
| Key_write_requests | 0 |
| Key_writes | 0 |
| Max_used_connections | 60 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 60 |
| Open_files | 66 |
| Open_streams | 0 |
| Opened_tables | 66 |
| Questions | 9308 |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
| Select_range | 0 |
| Select_range_check | 0 |
| Select_scan | 0 |
| Slave_running | OFF |
| Slave_open_temp_tables | 0 |
| Slow_launch_threads | 0 |
| Slow_queries | 0 |
| Sort_merge_passes | 0 |
| Sort_range | 0 |
| Sort_rows | 0 |
| Sort_scan | 0 |
| Table_locks_immediate | 3183 |
| Table_locks_waited | 6030 |
| Threads_cached | 30 |
| Threads_created | 61 |
| Threads_connected | 31 |
| Threads_running | 31 |
| Uptime | 135 |
+--------------------------+--------+
@end example
@cindex variables, status
......@@ -20400,6 +20405,12 @@ open by the slave thread
@item @code{Sort_range} @tab Number of sorts that where done with ranges.
@item @code{Sort_rows} @tab Number of sorted rows.
@item @code{Sort_scan} @tab Number of sorts that where done by scanning the table.
@item @code{Table_locks_immediate} @tab Number of times a table lock was
acquired immediately. Available after 3.23.33.
@item @code{Table_locks_waited} @tab Number of times a table lock could not
be acquired immediately and a wait was needed. If this is high, and you
have performance problems, you should first optimize your queries, and then
either split your table(s) or use replication. Available after 3.23.33.
@item @code{Threads_cached} @tab Number of threads in the thread cache.
@item @code{Threads_connected} @tab Number of currently open connections.
@item @code{Threads_created} @tab Number of threads created to handle connections.
......@@ -40814,6 +40825,9 @@ not yet 100 % confident in this code.
@appendixsubsec Changes in release 3.23.33
@itemize bullet
@item
Added @code{Table_locks_immediate} and @code{Table_locks_waited} status
variables
@item
Fixed bug in replication that broke slave server start with existing
@code{master.info}. This fixes a bug introduced in 3.23.32.
@item
......@@ -46638,10 +46652,15 @@ for @code{BDB} tables. @xref{Internal locking}. With @code{MyISAM}
tables one can freely mix @code{INSERT} and @code{SELECT} without locks
(@code{Versioning}).
Starting in version 3.23.33, you can analyze the table lock contention
on your system by checkining @code{Table_locks_waited} and
@code{Table_locks_immediate} environemt variables.
Some database users claim that @strong{MySQL} cannot support near the
number of concurrent users because it lacks row-level locking. This is
a may be true for some specific applications, but is' not generally
true. As always this depends totally on what the application does and what is the access/update pattern of the data.
true. As always this depends totally on what the application does and what
is the access/update pattern of the data.
Pros for row locking:
include/thr_lock.h
View file @ e3ad443d
......@@ -27,7 +27,8 @@ extern "C" {
#include <my_list.h>
struct st_thr_lock;
extern ulong locks_immediate,locks_waited ;
enum thr_lock_type { TL_IGNORE=-1,
TL_UNLOCK, /* UNLOCK ANY LOCK */
TL_READ, /* Read lock */
......
mysql-test/r/rpl000018.result 0 → 100644
View file @ e3ad443d
Log_name
master-bin.001
master-bin.002
n
3351
mysql-test/r/status.result
View file @ e3ad443d
Variable_name Value
Table_locks_immediate 5
Table_locks_immediate 0
Table_locks_waited 0
Variable_name Value
Table_locks_immediate 8
Table_locks_immediate 3
Table_locks_waited 1
mysql-test/t/overflow.test 0 → 100644
View file @ e3ad443d
connect (con1,localhost,boo,,test,0,mysql-master.sock);
connection con1;
-- error 1064;
drop database AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
mysql-test/t/rpl000018-master.sh 0 → 100755
View file @ e3ad443d
rm -f $MYSQL_TEST_DIR/var/lib/master-bin.*
cp $MYSQL_TEST_DIR/std_data/master-bin.001 $MYSQL_TEST_DIR/var/lib/
echo ./master-bin.001 > $MYSQL_TEST_DIR/var/lib/master-bin.index
mysql-test/t/rpl000018-slave.opt 0 → 100644
View file @ e3ad443d
--skip-slave-start --abort-slave-event-count=1
mysql-test/t/rpl000018.test 0 → 100644
View file @ e3ad443d
connect (master,localhost,root,,test,0,mysql-master.sock);
connect (slave,localhost,root,,test,0,mysql-slave.sock);
connection slave;
reset slave;
slave start;
connection master;
show master logs;
drop table if exists t1;
create table t1(n int);
insert into t1 values (3351);
save_master_pos;
connection slave;
sync_with_master;
select * from t1;
connection master;
drop table t1;
save_master_pos;
connection slave;
sync_with_master;
mysql-test/t/status.test
View file @ e3ad443d
connect (con1,localhost,root,,test,0,mysql-master.sock);
connect (con2,localhost,root,,test,0,mysql-master.sock);
#don't polute binlog
flush status;
show status like 'Table_lock%';
connection con1;
SET SQL_LOG_BIN=0;
......@@ -20,4 +20,4 @@ unlock tables;
connection con1;
reap;
show status like 'Table_lock%';
drop table t1;
mysys/thr_lock.c
View file @ e3ad443d
......@@ -387,7 +387,7 @@ static my_bool wait_for_lock(struct st_lock_list *wait, THR_LOCK_DATA *data,
else
{
result=0;
++locks_waited;
statistic_increment(locks_waited, &THR_LOCK_lock);
if (data->lock->get_status)
(*data->lock->get_status)(data->status_param);
check_locks(data->lock,"got wait_for_lock",0);
......
sql/mysqld.cc
View file @ e3ad443d
......@@ -260,7 +260,6 @@ ulong query_id=1L,long_query_count,long_query_time,aborted_threads,
delayed_queue_size,delayed_insert_threads,delayed_insert_writes,
delayed_rows_in_use,delayed_insert_errors,flush_time, thread_created;
ulong filesort_rows, filesort_range_count, filesort_scan_count;
extern "C" ulong locks_immediate, locks_waited;
ulong filesort_merge_passes;
ulong select_range_check_count, select_range_count, select_scan_count;
ulong select_full_range_join_count,select_full_join_count;
......
sql/slave.cc
View file @ e3ad443d
......@@ -1055,9 +1055,12 @@ static int exec_event(THD* thd, NET* net, MASTER_INFO* mi, int event_len)
break;
case STOP_EVENT:
close_temporary_tables(thd);
mi->inc_pos(event_len);
flush_master_info(mi);
if(mi->pos > 4) // stop event should be ignored after rotate event
{
close_temporary_tables(thd);
mi->inc_pos(event_len);
flush_master_info(mi);
}
delete ev;
break;
case ROTATE_EVENT:
......
sql/sql_base.cc
View file @ e3ad443d
......@@ -32,7 +32,6 @@
TABLE *unused_tables; /* Used by mysql_test */
HASH open_cache; /* Used by mysql_test */
extern "C" ulong locks_waited, locks_immediate;
static int open_unireg_entry(THD *thd,TABLE *entry,const char *db,
const char *name, const char *alias, bool locked);
......@@ -1167,8 +1166,8 @@ bool wait_for_tables(THD *thd)
{
/* Now we can open all tables without any interference */
thd->proc_info="Reopen tables";
if(!(result=reopen_tables(thd,0,0)))
++locks_waited;
result=reopen_tables(thd,0,0);
}
pthread_mutex_unlock(&LOCK_open);
thd->proc_info=0;
......
sql/sql_parse.cc
View file @ e3ad443d
......@@ -1886,6 +1886,13 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
if (db == any_db)
return FALSE; // Allow select on anything
if (strlen(db) > NAME_LEN || check_db_name(db))
{
net_printf(&thd->net,ER_WRONG_DB_NAME, db);
return TRUE;
}
if (db && (!thd->db || strcmp(db,thd->db)))
db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
thd->priv_user, db); /* purecov: inspected */
......
sql/sql_repl.cc
View file @ e3ad443d
......@@ -392,7 +392,7 @@ sweepstakes if you report the bug";
thd->mysys_var->current_mutex = log_lock;
thd->mysys_var->current_cond = &COND_binlog_update;
const char* proc_info = thd->proc_info;
thd->proc_info = "Waiting for update";
thd->proc_info = "Slave connection: waiting for binlog update";
pthread_mutex_unlock(&thd->mysys_var->mutex);
bool read_packet = 0, fatal_error = 0;
......
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