CONNECTIONS IF SPE

Merged from mysql-5.1 to mysql-5.5

               CONNECTIONS IF SPE

Problem description: -ssl-key value is not validated, you can assign any bogus 
text to --ssl-key and it is not verified that it exists, and more importantly, 
it allows the client to connect to mysqld.

Fix: Added proper validations checks for --ssl-key.

Note:
1) Documentation changes require for 5.1, 5.5, 5.6 and trunk in the sections
   listed below and the details are :

 http://dev.mysql.com/doc/refman/5.6/en/ssl-options.html#option_general_ssl
    and
 REQUIRE SSL section of
 http://dev.mysql.com/doc/refman/5.6/en/grant.html

2) Client having with option '--ssl', should able to get ssl connection. This 
will be implemented as part of separate fix in 5.6 and trunk.

When resolving outer fields, Item_field::fix_outer_fields()
creates new Item_refs for each execution of a prepared statement, so
these must be allocated in the runtime memroot. The memroot switching
before resolving JOIN::having causes these to be allocated in the
statement root, leaking memory for each PS execution.

ROWS THAT ARE EXPECTED

For non range/list partitioned tables (i.e. HASH/KEY):

When prune_partitions finds a multi-range list
(or in this test '<>') for a field of the partition index,
even if it cannot make any use of the multi-range,
it will continue with the next field of the partition index
and use that for pruning (even if it the previous
field could not be used). This results in partitions is
pruned away, leaving partitions that only matches
the last field in the partition index, and will exclude
partitions which might match any previous fields.

Fixed by skipping rest of partitioning key fields/parts
if current key field/part could not be used.

Also notice it is the order of the fields in the CREATE TABLE
statement that triggers this bug, not the order of fields in
primary/unique key or PARTITION BY KEY ().
It must not be the last field in the partitioning expression that
is not equal (or have a non single point range).
I.e. the partitioning index is created with the same field order
as in the CREATE TABLE. And for the bug to appear
the last field must be a single point and some previous field
must be a multi-point range.

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IN QUERIES

This bug was caused by an incorrect fix of
Bug#13807811 BTR_PCUR_RESTORE_POSITION() CAN SKIP A RECORD

There was nothing wrong with btr_pcur_restore_position(), but with the
use of it in the table scan during index creation.

rb:1206 approved by Jimmy Yang

WHEN STDIN IS A PIPE
            
Problem: Mysqlbinlog does not accept the input from STDIN when 
STDIN is a pipe. This prevents the users from passing the input file
through a shell pipe.    

Background: The my_seek() function does not check if the file descriptor
passed to it is regular (seekable) file. The check_header() function in
mysqlbinlog calls the my_b_seek() unconditionally and it fails when
the underlying file is a PIPE.  
            
Resolution: We resolve this problem by checking if the underlying file
is a regular file by using my_fstat() before calling my_b_seek(). 
If the underlying file is not seekable we skip the call to my_b_seek()
in check_header().

             SHOW 2012 INSTEAD OF 2011

* Added a new macro to hold the current year :
  COPYRIGHT_NOTICE_CURRENT_YEAR
* Modified ORACLE_WELCOME_COPYRIGHT_NOTICE macro
  to take the initial year as parameter and pick
  current year from the above mentioned macro.

              AND LIBCRYPTO

Description: Merge from 5.1 to 5.5

              AND LIBCRYPTO

Problem: libmysqlclient_r exports symbols from yaSSL library which
         conflict with openSSL symbols. This issue is related to symbols
         used by CURL library and are defined in taocrypt. Taocrypt has
         dummy implementation of these functions. Due to this when a
         program which uses libcurl library functions is compiled using
         libmysqlclient_r and libcurl, it hits segmentation fault in
         execution phase.

Solution: MySQL should not be exporting such symbols. However, these
          functions are not used by MySQL code at all. So avoid compiling
          them in the first place.

FOREVER MDL LOCK

Analysis:
----------
While granting MDL lock for the lock requests in wait queue,
first the lock is granted to the high priority lock types
and then to the low priority lock types.

MDL Priority Matrix,
  +-------------+----+---+---+---+----+-----+
  | Locks       |    |   |   |   |    |     |
  | has Priority|    |   |   |   |    |     |
  | over --->   |  S | SR| SW| SU| SNW| SNRW|   
  +-------------+----+---+---+---+----+-----+
  | X           |  + | + | + | + | +  | +   |
  +-------------|----|---|---|---|----|-----|
  | SNRW        |  - | + | + | - | -  | -   |
  +-------------|----|---|---|---|----|-----|
  | SNW         |  - | - | + | - | -  | -   |
  +-------------+----+---+---+---+----+-----+

Here '+' means, Lock priority is higher.
     '-' means, Has same priority

In the scenario where,
   *. Lock wait queue has requests of type S/SR/SW/SU.
   *. And locks of high priority X/SNRW/SNW are requested 
      continuously.

In this case, while granting lock, always first high priority 
lock requests(X/SNRW/SNW) are considered. Low priority 
locks(S/SR/SW/SU) will not get chance and they will 
wait forever.

In the scenario for which this bug is reported, application
executed many LOCK TABLES ... WRITE statements concurrently.
These statements request SNRW lock. Also there were some
connections trying to execute DML statements requesting SR
lock. Since SNRW lock request has higher priority (and as
they were too many waiting SNRW requests) lock is always 
granted to it. So, lock request SR will wait forever, resulting
in DML starvation.

How is this handled in 5.1?
---------------------------
Even in 5.1 we have low priority lock starvation issue.
But, in 5.1 thread locking, system variable 
"max_write_lock_count" can be configured to grant
some pending read lock requests. After 
"max_write_lock_count" of write lock grants all the low
priority locks are granted.

Why this issue is seen in 5.5/trunk?
---------------------------------
In 5.5/trunk MDL locking, "max_write_lock_count" system 
variable exists but not used in MDL, only thread lock uses
it. So no effect of "max_write_lock_count" in MDL locking.
This means that starvation of metadata locks is possible 
even if max_write_lock_count is used.

Looks like, customer was using "max_write_lock_count" in
5.1 and when upgraded to 5.5, starvation is seen because
of not having effect of "max_write_lock_count" in MDL.

Fix:
----------
As a fix, support for max_write_lock_count is added to MDL.
To maintain write lock counter per MDL_lock object, new
member "m_hog_lock_count" is added in MDL_lock.

And following logic is added to increment the counter in 
function reschedule_waiters, 
(reschedule_waiters function is called while thread is
 releasing the lock)
    - After granting lock request from the wait queue.
    -  Check if there are any S/SR/SU/SW exists in the wait queue
      - If yes then increment the "m_hog_lock_count"

And following logic is added in the same function to
handle pending S/SU/SR/SW locks
    
    - Before granting locks 
    - Check if max_write_lock_count <= m_hog_lock_count
    - If Yes, then try to grant S/SR/SW/SU locks. 
      (Since all of these has same priority, all locks are
       granted together. But some lock grant may fail because
       of grant incompatibility)
    - Reset m_hog_lock_count if there no low priority lock
      requests in wait queue. 
    - return

Note:
--------------------------
In the lock priority matrix explained above,
though X has priority over the SNW and SNRW. X locks is
taken mostly for RENAME, TRUNCATE, CREATE ... operations.
So lock type X may not be requested in loop continuously 
in real world applications, as compared to other lock 
request types. So, lock request of type SNW and SNRW are 
not starved. So, we can grant all S/SR/SU/SW in one shot,
without considering SNW & SNRW lock request starvation.

ALTER table operations take SU lock first and then 
upgrade to SNW if required. All S, SR, SW, SU have same
lock priority. So while granting SU, request of types
SR, SW, S are also granted in one shot. So, lock request 
of type SU->SNW in loop will not make other low priority 
lock request to starve.

But, when there is request for lock of type SNRW, lock
requests of lower priority types are not granted. And if 
SNRW is requested in loop continuously then all 
S, SR, SW, SU are starved.

This patch addresses the latter scenario.
When we have S/SR/SW/SU in wait queue and if 
there are
    - Continuous SNRW lock requests
    - OR one or more X and Continuous SNRW lock requests.
    - OR one SNW and Continuous SNRW lock requests.
    - OR one SNW, one or more X and continuous SNRW lock 
      requests.
in wait queue then, S/SR/SW/SU lock request are starved.

Backport the fix from 5.6 to 5.1
Base bug number : 11765562

Space available for merging was calculated incorrectly.

Null merge from 5.1 to 5.5

Fixed the missing of federated/include folder at the time 
of preparing package distribution, issue happens only in 5.1

               IS PLACE HOLDER AND USE SERVER-SIDE 

Analysis:
LIMIT always takes nonnegative integer constant values. 

http://dev.mysql.com/doc/refman/5.6/en/select.html

So parsing of value '5' for LIMIT in SELECT fails.

But, within prepared statement, LIMIT parameters can be
specified using '?' markers. Value for the parameter can
be supplied while executing the prepared statement.

Passing string values, float or double value for LIMIT
works well from CLI. Because, while setting the value
for the parameters from the variable list (added using
SET), if the value is for parameter LIMIT then its 
converted to integer value. 

But, when prepared statement is executed from the other
interfaces as J connectors, or C applications etc.
The value for the parameters are sent to the server
with execute command. Each item in log has value and
the data TYPE. So, While setting parameter value
from this log, value is set to all the parameters
with the same data type as passed.
But here logic to convert value to integer type
if its for LIMIT parameter is missing.
Because of this,string '5' is set to LIMIT.
And the same is logged into the binlog file too. 

Fix:
When executing prepared statement having parameter for
CLI it worked fine, as the value set for the parameter
is converted to integer. And this failed in other 
interfaces as J connector,C Applications etc as this 
conversion is missing.

So, as a fix added check while setting value for the
parameters. If the parameter is for LIMIT value then
its converted to integer value.

                  
Merged pb2 test failure fix from mysql-5.1 to mysql-5.5

Fix for pb2 test failure.

             WORK + SAVES ROOT PASSWORD TO DISK!

The secure installation scripts connect to the
server by storing the password in a temporary
option file. Now, if the script gets killed or
fails for some reason, the removal of the option
file may not take place.

This patch introduces following enhancements :
* (.sh) Made sure that cleanup happens at every
  call to 'exit 1'. This is performed implicitly
  by END{} in pl.in.
* (.pl.in) Added a warning in case unlink fails
  to delete the option/query files.
* (.sh/.pl.in) Added more signals to the signal
  handler list. SIG# 1, 3, 6, 15

      
Merged from mysql-5.1 to mysql-5.5

Problem description:
Table 't' created with two colums having compound index on both the 
columns under innodb/myisam engine at remote machine. In the local 
machine same table is created undet the federated engine.
A select having where clause with along 'AND' operation gives wrong 
results on local machine.

Analysis: 
The given query at federated engine is wrongly transformed by 
federated::create_where_from_key() function and the same was sent to 
the remote machine. Hence the local machine is showing wrong results.

Given query "select c1 from t where c1 <= 2 and c2 = 1;"
Query transformed, after ha_federated::create_where_from_key() function is:
SELECT `c1`, `c2` FROM `t` WHERE  (`c1` IS NOT NULL ) AND 
( (`c1` >= 2)  AND  (`c2` <= 1) ) and the same sent to real_query().
In the above the '<=' and '=' conditions were transformed to '>=' and 
'<=' respectively.

ha_federated::create_where_from_key() function behaving as below:
The key_range is having both the start_key and end_key. The start_key 
is used to get "(`c1` IS NOT NULL )" part of the where clause, this 
transformation is correct. The end_key is used to get "( (`c1` >= 2) 
AND  (`c2` <= 1) )", which is wrong, here the given conditions('<=' and '=') 
are changed as wrong conditions('>=' and '<=').
The end_key is having {key = 0x39fa6d0 "", length = 10, keypart_map = 3, 
flag = HA_READ_AFTER_KEY}

The store_length is having value '5'. Based on store_length and length 
values the condition values is applied in HA_READ_AFTER_KEY switch case.
The switch case 'HA_READ_AFTER_KEY' is applicable to only the last part of 
the end_key and for previous parts it is going to 'HA_READ_KEY_OR_NEXT' case, 
here the '>=' is getting added as a condition instead of '<='.

Fix:
Updated the 'if' condition in 'HA_READ_AFTER_KEY' case to affect for all 
parts of the end_key. i.e 'i > 0' will used for end_key, Hence added it in 
the if condition.

PROBLEM: 
mysql provides a feature where in a session which is 
idle for a period specified by the wait_timeout variable
(whose value is in seconds), the session is closed
This feature is not present when we use thread pool.
FIX:
This patch implements the interface functions which is 
required to implement the wait_timeout functionality
in the thread pool plugin.