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Commit 74fd4504 authored by heikki@hundin.mysql.fi's avatar heikki@hundin.mysql.fi
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Many files: 

  Push the patch of Jan Lindstrom: better comments
ha_innodb.cc:
  Partial fix for Bug #12263 : we let InnoDB always to perform a rollback on the trx object if MySQL closes a connection; but we do print a warning to the .err log if an InnoDB transaction was active; we may remove that print later, since the situation really is not a bug; MySQL just is not aware that some cursor operation started an InnoDB transaction
parent 05d4c0c7
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Showing with 89 additions and 57 deletions
innobase/include/read0read.h
View file @ 74fd4504
......@@ -68,7 +68,6 @@ void
read_view_print(
/*============*/
read_view_t* view); /* in: read view */
/*************************************************************************
Create a consistent cursor view for mysql to be used in cursors. In this
consistent read view modifications done by the creating transaction or future
......@@ -78,10 +77,9 @@ cursor_view_t*
read_cursor_view_create_for_mysql(
/*==============================*/
trx_t* cr_trx);/* in: trx where cursor view is created */
/*************************************************************************
Close a given consistent cursor view for and restore global read view
back to a transaction. */
Close a given consistent cursor view for mysql and restore global read view
back to a transaction read view. */
void
read_cursor_view_close_for_mysql(
......@@ -90,7 +88,7 @@ read_cursor_view_close_for_mysql(
cursor_view_t* curview); /* in: cursor view to be closed */
/*************************************************************************
This function sets a given consistent cursor view to a transaction
read view if given consistent cursor view is not null. Otherwice, function
read view if given consistent cursor view is not NULL. Otherwise, function
restores a global read view to a transaction read view. */
void
......
innobase/include/trx0trx.h
View file @ 74fd4504
......@@ -606,14 +606,13 @@ struct trx_struct{
/* memory heap for the global read
view */
read_view_t* global_read_view;
/* consistent read view used in the
transaction is stored here if
transaction is using a consistent
read view associated to a cursor */
/* consistent read view associated
to a transaction or NULL */
read_view_t* read_view; /* consistent read view used in the
transaction or NULL, this read view
can be normal read view associated
to a transaction or read view
if defined can be normal read view
associated to a transaction (i.e.
same as global_read_view) or read view
associated to a cursor */
/*------------------------------*/
UT_LIST_BASE_NODE_T(trx_named_savept_t)
......
innobase/read/read0read.c
View file @ 74fd4504
......@@ -347,8 +347,8 @@ read_cursor_view_create_for_mysql(
}
/*************************************************************************
Close a given consistent cursor view for and restore global read view
back to a transaction. */
Close a given consistent cursor view for mysql and restore global read view
back to a transaction read view. */
void
read_cursor_view_close_for_mysql(
......@@ -372,7 +372,7 @@ read_cursor_view_close_for_mysql(
/*************************************************************************
This function sets a given consistent cursor view to a transaction
read view if given consistent cursor view is not null. Otherwice, function
read view if given consistent cursor view is not NULL. Otherwise, function
restores a global read view to a transaction read view. */
void
......
innobase/row/row0sel.c
View file @ 74fd4504
......@@ -3100,6 +3100,13 @@ row_search_for_mysql(
"http://dev.mysql.com/doc/mysql/en/InnoDB_troubleshooting_datadict.html\n"
"InnoDB: how you can resolve the problem.\n",
prebuilt->table->name);
/* Restore a global read view back to a transaction. This
forces MySQL always to set a cursor view before fetch from
a cursor. */
trx->read_view = trx->global_read_view;
return(DB_ERROR);
}
......@@ -4091,8 +4098,9 @@ row_search_for_mysql(
}
func_exit:
/* Restore a global read view back to transaction. This forces
MySQL always to set cursor view before fetch if it is used. */
/* Restore a global read view back to a transaction. This
forces MySQL always to set a cursor view before fetch from
a cursor. */
trx->read_view = trx->global_read_view;
......
innobase/srv/srv0srv.c
View file @ 74fd4504
......@@ -1711,6 +1711,10 @@ srv_printf_innodb_monitor(
fprintf(file, "%ld queries inside InnoDB, %lu queries in queue\n",
(long) srv_conc_n_threads,
(ulong) srv_conc_n_waiting_threads);
fprintf(file, "%lu read views open inside InnoDB\n",
UT_LIST_GET_LEN(trx_sys->view_list));
n_reserved = fil_space_get_n_reserved_extents(0);
if (n_reserved > 0) {
fprintf(file,
......
innobase/srv/srv0start.c
View file @ 74fd4504
......@@ -1833,6 +1833,16 @@ innobase_shutdown_for_mysql(void)
srv_free();
os_sync_free();
/* Check that all read views are closed except read view owned
by a purge. */
if (UT_LIST_GET_LEN(trx_sys->view_list) > 1) {
fprintf(stderr,
"InnoDB: Error: all read views were not closed before shutdown:\n"
"InnoDB: %lu read views open \n",
UT_LIST_GET_LEN(trx_sys->view_list) - 1);
}
/* 5. Free all allocated memory and the os_fast_mutex created in
ut0mem.c */
......
innobase/trx/trx0trx.c
View file @ 74fd4504
......@@ -833,26 +833,14 @@ trx_commit_off_kernel(
lock_release_off_kernel(trx);
if (trx->read_view) {
/* If transaction has a global read view this case
means that transaction has been using a consistent
read view associated to a cursor. Only the global
read view associated to a transaction is closed
and read view is then removed from the transaction.
If read view associated to a cursor is still used
it must be re-registered to another transaction. */
if (UNIV_LIKELY_NULL(trx->global_read_view)) {
trx->read_view = trx->global_read_view;
}
read_view_close(trx->read_view);
if (trx->global_read_view) {
read_view_close(trx->global_read_view);
mem_heap_empty(trx->global_read_view_heap);
trx->read_view = NULL;
trx->global_read_view = NULL;
}
trx->read_view = NULL;
if (must_flush_log) {
mutex_exit(&kernel_mutex);
......
sql/ha_innodb.cc
View file @ 74fd4504
......@@ -538,7 +538,7 @@ innobase_mysql_prepare_print_arbitrary_thd(void)
}
/*****************************************************************
Relases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
Releases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
......@@ -1700,7 +1700,7 @@ innobase_store_binlog_offset_and_flush_log(
/* Commits the mini-transaction */
mtr_commit(&mtr);
/* Syncronous flush of the log buffer to disk */
/* Synchronous flush of the log buffer to disk */
log_buffer_flush_to_disk();
}
#endif
......@@ -2132,15 +2132,34 @@ innobase_savepoint(
/*********************************************************************
Frees a possible InnoDB trx object associated with the current THD. */
static int
static
int
innobase_close_connection(
/*======================*/
/* out: 0 or error number */
THD* thd) /* in: handle to the MySQL thread of the user
whose resources should be free'd */
{
trx_free_for_mysql((trx_t*)thd->ha_data[innobase_hton.slot]);
trx_t* trx;
trx = (trx_t*)thd->ha_data[innobase_hton.slot];
ut_a(trx);
if (trx->conc_state != TRX_NOT_STARTED) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: Warning: MySQL is closing a connection"
"InnoDB: that has an active InnoDB transaction. We roll back that\n"
"InnoDB: transaction. %lu row modifications to roll back.\n",
(ulong)ut_dulint_get_low(trx->undo_no));
}
innobase_rollback_trx(trx);
trx_free_for_mysql(trx);
return(0);
}
......@@ -2834,7 +2853,7 @@ ha_innobase::store_key_val_for_row(
/* All indexes on BLOB and TEXT are column prefix
indexes, and we may need to truncate the data to be
stored in the kay value: */
stored in the key value: */
if (blob_len > key_part->length) {
blob_len = key_part->length;
......@@ -7117,7 +7136,7 @@ int
innobase_rollback_by_xid(
/*=====================*/
/* out: 0 or error number */
XID *xid) /* in: X/Open XA transaction idenfification */
XID *xid) /* in: X/Open XA transaction identification */
{
trx_t* trx;
......@@ -7131,9 +7150,10 @@ innobase_rollback_by_xid(
}
/***********************************************************************
This function creates a consistent view for a cursor and start a transaction
if it has not been started. This consistent view is then used inside of MySQL
when accesing records using a cursor. */
Create a consistent view for a cursor based on current transaction
which is created if the corresponding MySQL thread still lacks one.
This consistent view is then used inside of MySQL when accessing records
using a cursor. */
void*
innobase_create_cursor_view(void)
......@@ -7145,9 +7165,9 @@ innobase_create_cursor_view(void)
}
/***********************************************************************
This function closes the given consistent cursor view. Note that
global read view is restored to a transaction and a transaction is
started if it has not been started. */
Close the given consistent cursor view of a transaction and restore
global read view to a transaction read view. Transaction is created if the
corresponding MySQL thread still lacks one. */
void
innobase_close_cursor_view(
......@@ -7159,13 +7179,15 @@ innobase_close_cursor_view(
}
/***********************************************************************
This function sets the given consistent cursor view to a transaction.
If a transaction does not exist, transaction is started. */
Set the given consistent cursor view to a transaction which is created
if the corresponding MySQL thread still lacks one. If the given
consistent cursor view is NULL global read view of a transaction is
restored to a transaction read view. */
void
innobase_set_cursor_view(
/*=====================*/
void* curview)/* in: Consistent cursor view to be closed */
void* curview)/* in: Consistent cursor view to be set */
{
read_cursor_set_for_mysql(check_trx_exists(current_thd),
(cursor_view_t*) curview);
......
sql/ha_innodb.h
View file @ 74fd4504
......@@ -302,7 +302,7 @@ which is in the prepared state */
int innobase_rollback_by_xid(
/* out: 0 or error number */
XID *xid); /* in : X/Open XA Transaction Idenfification */
XID *xid); /* in : X/Open XA Transaction Identification */
int innobase_xa_end(THD *thd);
......@@ -312,9 +312,10 @@ int innobase_repl_report_sent_binlog(THD *thd, char *log_file_name,
my_off_t end_offset);
/***********************************************************************
This function creates a consistent view for a cursor and start a transaction
if it has not been started. This consistent view is then used inside of MySQL
when accesing records using a cursor. */
Create a consistent view for a cursor based on current transaction
which is created if the corresponding MySQL thread still lacks one.
This consistent view is then used inside of MySQL when accessing records
using a cursor. */
void*
innobase_create_cursor_view(void);
......@@ -322,9 +323,9 @@ innobase_create_cursor_view(void);
/* out: Pointer to cursor view or NULL */
/***********************************************************************
This function closes the given consistent cursor view. Note that
global read view is restored to a transaction and a transaction is
started if it has not been started. */
Close the given consistent cursor view of a transaction and restore
global read view to a transaction read view. Transaction is created if the
corresponding MySQL thread still lacks one. */
void
innobase_close_cursor_view(
......@@ -332,8 +333,10 @@ innobase_close_cursor_view(
void* curview); /* in: Consistent read view to be closed */
/***********************************************************************
This function sets the given consistent cursor view to a transaction.
If a transaction does not exist, transaction is started. */
Set the given consistent cursor view to a transaction which is created
if the corresponding MySQL thread still lacks one. If the given
consistent cursor view is NULL global read view of a transaction is
restored to a transaction read view. */
void
innobase_set_cursor_view(
......
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