FORMAT_DESCRIPTION_LOG_EVENT::CALC_SERVER_VERSION_SPLIT

Problem: When reading a Format_description_log_event, it supposes MySQL
version is always valid and DBUG_ASSERTION is used check the version number.
However, user may give a wrong binlog offset, even give a faked binary event
which includes an invalid MySQL version. This will cause server crash.

Fix: The assertions are removed and an error will be reported if MySQL
version in Format_description_log_event is invalid.

                           IN DEACTIVATE_DDL_LOG_ENTRY

Update of comments according to reviewers request.

revid that is being reverted: marko.makela@oracle.com-20121128070024-hb56t41limja8edz

Description: A very large database name causes buffer
             overflow in functions acl_get() and
             check_grant_db() in sql_acl.cc. It happens
             due to an unguarded string copy operation.
             This puts required sanity checks before
             copying db string to destination buffer.

The converted implicit lock should wait for the prior conflicting lock if found.

rb://1437 approved by Marko

BUF_PAGE_GET_GEN REDUNDANT?

buf_page_get_gen(): When decompressing a compressed page that had
already been accessed in the buffer pool, do not attempt to merge
buffered changes.

rb:1602 approved by Inaam Rana

 trx_undo_prev_version_build() should confirm existence of inherited (not-own) external pages.

Bug #14676084 : ROW_UNDO_MOD_UPD_DEL_SEC() DOESN'T NEED UNDO_ROW AND UNDO_EXT INITIALIZED
 mtr script could hit the assertion error !bpage->file_page_was_freed using this path.
 So, also fixed

rb://1337 approved by Marko Makela.

Description: Updated yassl to version 2.2.2

rb://1546
approved by: Sunny Bains and Marko Makela

Our dealing of buf_page_t::access_time flag is inaccurate.
* If LRU eviction has not started we don't set the access_time
* If LRU eviction is started we set it only if the block is not
'too old'.
* Not a correctness issue but we hold buf_pool::mutex when
setting the flag

This patch fixes this by:
* Setting flag unconditionally whenever the first page access happens
* Use buf_page_t mutex to protect write to the flag

The problem is related to the changes made in bug#13025132.
get_partition_set can do dynamic pruning which limits the partitions
to scan even further. This is not accounted for when setting
the correct start of the preallocated record buffer used in
the priority queue, thus leading to wrong buffer is used
(including wrong preset partitioning id, connected to that buffer).

Solution is to fast forward the buffer pointer to point to the correct
partition record buffer.

No commit message

Remove a bogus debug assertion.

CHAR(n) in ROW_FORMAT=REDUNDANT tables is always fixed-length
(n*mbmaxlen bytes), but in the temporary file it is variable-length
(n*mbminlen to n*mbmaxlen bytes) for variable-length character sets,
such as UTF-8.

The temporary file format used during index creation and online ALTER
TABLE is based on ROW_FORMAT=COMPACT. Thus, it should use the
variable-length encoding even if the base table is in
ROW_FORMAT=REDUNDNAT.

dtype_get_fixed_size_low(): Replace an assertion-like check with a
debug assertion.

rec_init_offsets_comp_ordinary(), rec_convert_dtuple_to_rec_comp():
Make this an inline function.  Replace 'ulint extra' with 'bool temp'.

rec_get_converted_size_comp_prefix_low(): Renamed from
rec_get_converted_size_comp_prefix(), and made inline. Add the
parameter 'bool temp'. If temp=true, do not add REC_N_NEW_EXTRA_BYTES.

rec_get_converted_size_comp_prefix(): Remove the comment about
dict_table_is_comp(). This function is only to be called for other
than ROW_FORMAT=REDUNDANT records.

rec_get_converted_size_temp(): New function for computing temporary
file record size. Omit REC_N_NEW_EXTRA_BYTES from the sizes.

rec_init_offsets_temp(), rec_convert_dtuple_to_temp(): New functions,
for operating on temporary file records.

rb:1559 approved by Jimmy Yang

No commit message

No commit message

btr_lift_page_up() writes wrong page number (different by -1) for upper than father page.
But in almost all of the cases, the father page should be root page, no upper
pages. It is very rare path.

In addition the leaf page should not be lifted unless the father page is root.
Because the branch pages should not become the leaf pages.

rb://1336 approved by Marko Makela.

When a new primary key is added to an InnoDB table, then the following
steps are taken by InnoDB plugin:

.  let t1 be the original table.
.  a temporary table t1@00231 will be created by cloning t1.
.  all data will be copied from t1 to t1@00231.
.  rename t1 to t1@00232.
.  rename t1@00231 to t1.
.  drop t1@00232.

The rename and drop operations involve file operations.  But file operations
cannot be rolled back.  So in row_merge_rename_tables(), just after doing data
dictionary update and before doing any file operations, generate redo logs
for file operations and commit the transaction.  This will ensure that any
crash after this commit, the table is still recoverable by moving .ibd and
.frm files.  Manual recovery is required.

During recovery, the rename file operation redo logs are processed.
Previously this was being ignored.

rb://1460 approved by Marko Makela.

              TABLE DATA IF DUMPS MYSQL DATABA
Problem: If mysqldump is run without --events (or with --skip-events)
it will not dump the mysql.event table's data. This behaviour is inconsistent
with that of --routines option, which does not affect the dumping of
mysql.proc table. According to the Manual, --events (--skip-events) defines,
if the Event Scheduler events for the dumped databases should be included
in the mysqldump output and this has nothing to do with the mysql.event table
itself.
Solution: A warning has been added when mysqldump is used without --events 
(or with --skip-events) and a separate patch with the behavioral change 
will be prepared for 5.6/trunk.

 
 Analysis
 --------- 
 
 my_stat() calls stat() and if the stat() call fails we try to set 
 the variable  my_errno which is actually a thread specific data .
 We try to get the  address of this thread specific data using
 my_pthread_getspecifc(),but for the purge thread we have not defined 
 any thread specific data so it returns null and when dereferencing 
 null we get a segmentation fault.
        init_available_charsets() seen in the core stack is invoked 
 through  pthread_once() .pthread_once is used for one time 
 initialization.Since free_charsets() is called before innodb plugin 
 shutdown ,purge thread calls init_avaliable_charsets() which leads 
 to the crash.

 Fix
 ---
 Call free_charsets() after the innodb plugin shutdown,since purge 
 threads are still using the charsets. 

Follow up patch to address the pb2 failures.

Brief description: After insert some rows to MEMORY table with HASH key some 
rows can't be deleted in one step.    

Problem Analysis/solution: info->current_ptr will have the information about the
current hash pointer from where we can traverse to the list to get all the       
remaining tuples.
      
In hp_delete_key we are updating info->current_ptr with the last_pos based on       
the flag parameter(which is the keydef and last index are same). As part of the       
fix we are making it to zero only when the code flow reaches to the end of the       
function hp_delete_key() it means that the next record which has to get deleted       
will be at the starting of the list so, that in the next call to       
read record(heap_rnext()) will take line number 100 path instead of 102 path, 
please see the below code in file hp_rnext.c, function heap_rnext().
 99       else if (!info->current_ptr)              /* Deleted or first call */
100         pos= hp_search(info, keyinfo, info->lastkey, 0);
101       else  
102         pos= hp_search(info, keyinfo, info->lastkey, 1);

with that change the hp_search() will update the info->current_ptr with the 
record which needs to be deleted.

PROBLEM 
-------

optimize on partiton will recreate the whole table 
instead of just partition.

ANALYSIS
--------

At present innodb doesn't support optimize option ,so we do a rebuild of the 
whole table and then call analyze() on the table.Presently for any optimize()
option (on table or partition) we display the following info to the user 

"Table does not support optimize, doing recreate + analyze instead".

FIX
---

It was decided for GA versions(5.1 and 5.5) whenever the user tries to 
optimize a partition(s) we will will display the following info the user

"Table does not support optimize on partitions.
All partitions will be rebuilt and analyzed."

Earlier partitions were not analyzed.Now all partitions  will be analyzed.  

If the user wants to optimize the whole table ,we will display the
previous info to the user. i.e

"Table does not support optimize, doing recreate + analyze instead"

For 5.6+ versions we will raise a new bug to support optimize() options
in innodb.

Add missing DBUG_RETURNs, otherwise the debug-stack gets messed up,
and _db_enter_ and _db_exit_ will access data outside the current stack frame.

              TO 'MYISAM_SORT_BUFFER_SIZE'
Problem: 'myisam_sort_buffer_size' is a parameter used by 
mysqld program only whereas 'sort_buffer_size' is used by
mysqld and myisamchk programs. But the error message printed
when myisamchk program is run with insufficient buffer size 
is myisam_sort_buffer_size is too small which may mislead to the
server parameter myisam_sort_buffer_size.
SOLUTION: A parameter 'myisam_sort_buffer_size' is added as an
alias for 'sort_buffer_size' and the 'sort_buffer_size' parameter
is marked as deprecated. So myisamchk also has both the parameters
with the same role.

               main.mysqlbinlog_row_innodb are skipped by mtr

=== Problem ===

The following tests are wrongly placed in main suite and as a
result these are not run with proper binlog format combinations.
Some are always skipped by mtr.
1) mysqlbinlog_row_myisam
2) mysqlbinlog_row_innodb
3) mysqlbinlog_row.test
4) mysqlbinlog_row_trans.test
5) mysqlbinlog-cp932
6) mysqlbinlog2
7) mysqlbinlog_base64

=== Background ===

mtr runs the tests placed in main suite with binlog format=stmt.
Those that need to be tested against binlog format=row or mixed
or more than one binlog format and require only one mysql server
are placed in binlog suite. mtr runs tests in binlog suite with
all three binlog formats(stmt,row and mixed).

=== Fix ===


1) Moved the test listed in problem section above to binlog suite.
2) Added prefix "binlog_" to the name of each test case moved.
   Renamed the coresponding result files and option files accordingly. 

No commit message

IN ALTER TABLE ... ADD UNIQUE KEY

A bogus debug assertion failure occurred when reporting a duplicate
key on a column prefix of a CHAR column.

This is a regression from Bug#14729221 IN-PLACE ALTER TABLE REPORTS ''
INSTEAD OF REAL DUPLICATE VALUE FOR PREFIX KEYS. The assertion is only
present when UNIV_DEBUG is defined (which it is in debug builds
starting from MySQL 5.5). It is a case of overasserting.

Fix approved by Inaam Rana on IM.

Moved explicit instantiation of available_buffer and valid_buffer_range 
template functions to sql/log_event.cc.

Merge bundle on mysql-5.1.

Problem:-
When we execute a query which has subquery with GROUP BY, ORDER BY and have a
BLOB column,results a memory leak.

Analysis:-
In case of subquery, which have GROUP BY on BLOB and a ORDER BY on other field
and BLOB is not a key. We allocate a tmp buffer to copy_field to take care of
BLOB value.This copy_field value can have copies of its in two join(objects),
so while freeing this copy_field we have to take care that it is
not deleted twice.
The double deletion of tmp_table_param.copy_field is handled by two patches.

One by Kostja :
revid:sp1r-konstantin@mysql.com-20050627101056-55153
Fix the broken test suite in -debug build.

and other by Oleksandr
revid:sp1r-bell@sanja.is.com.ua-20060118114857-19905
Excluded posibility of tmp_table_param.copy_field double deletion (BUG#14851).

both of this patches are commited in different branch and while
merging they both get placed,but there is no need for Kostja patch as Oleksandr
patch handle this.

LEN <= SIZEOF(ULONGLONG)

This bug was caught in the WL#6255 ALTER TABLE...ADD COLUMN in MySQL
5.6, but there is a bug in all InnoDB versions that support
auto-increment columns.

row_search_autoinc_read_column(): When reading the maximum value of
the auto-increment column, and the column only contains NULL values,
return 0. This corresponds to the case when the table is empty in
row_search_max_autoinc().

rb:1415 approved by Sunny Bains

FAILED IN DEACTIVATE_DDL_LOG_ENTRY

deallocate_ddl_log_entry() can be called without having
locked LOCK_gdl. It uses a global buffer for reading and
writing entries in the ddl_log, and since it is not protected
by any mutex, two concurrent threads can overwrite the
content in the global buffer, so it can be different from
what was read.
Thread a reads from entry 1 into global
buffer, thread b reads from entry 2 into global buffer,
thread a writes from global buffer into entry 1
-> entry 1 is not the content of entry 2.

This is especially bad for replace entries, which uses
two phases, and does not deactivate the whole entry
after the first phase, but increases the phase instead.

Fixed by using thread local storage (stack) instead of global
storage (global buffer).

Also added buffer and size arguments to
read/write_ddl_log_file_entry.

Also only read/write first bytes in entries in
deactivate_ddl_log_entry.

Also fixed the scenario where it will try to recover from a server
compiled with a different value of IO_SIZE (very uncommon!)

updated patch with set_ddl_log_entry_from_buf
and removed read_ddl_log_entry.

Manually tested, no test case included.

mysqld_safe script did not heed MySQL specific environment variable
$UMASK, leading to divergent behavior between mysqld and mysqld_safe.

Patch adds an approximation of mysqld's behavior to mysqld_safe,
within the bounds dictated by attempt to have mysqld_safe run on
even the most basic of shells (proper '70s sh, not just bash
with a fancy symlink).

Patch also adds approximation of said behavior to mysqld_multi
(in perl).

(backport)

rb://1334
approved by: Inaam Rana