into janus.mylan:/usr/home/serg/Abk/mysql-5.1
include/my_global.h:
Auto merged
sql/ha_ndbcluster.cc:
Auto merged
sql/ha_partition.cc:
Auto merged
sql/handler.cc:
Auto merged
sql/item_subselect.cc:
Auto merged
sql/log.cc:
Auto merged
sql/log_event.cc:
Auto merged
sql/mysql_priv.h:
Auto merged
sql/opt_range.cc:
Auto merged
sql/slave.cc:
Auto merged
sql/slave.h:
Auto merged
sql/sp.cc:
Auto merged
sql/sql_acl.cc:
Auto merged
sql/sql_insert.cc:
Auto merged
sql/sql_select.cc:
Auto merged
sql/sql_select.h:
Auto merged
sql/sql_servers.cc:
Auto merged
sql/table.cc:
Auto merged
sql/table.h:
Auto merged
sql/tztime.cc:
Auto merged
storage/heap/ha_heap.cc:
Auto merged
storage/innobase/handler/ha_innodb.cc:
Auto merged
storage/myisam/ha_myisam.cc:
Auto merged
storage/myisammrg/ha_myisammrg.h:
Auto merged
TABLE ... WRITE".
Memory and CPU hogging occured when connection which had to wait for table
lock was serviced by thread which previously serviced connection that was
killed (note that connections can reuse threads if thread cache is enabled).
One possible scenario which exposed this problem was when thread which
provided binlog dump to replication slave was implicitly/automatically
killed when the same slave reconnected and started pulling data through
different thread/connection.
The problem also occured when one killed particular query in connection
(using KILL QUERY) and later this connection had to wait for some table
lock.
This problem was caused by the fact that thread-specific mysys_var::abort
variable, which indicates that waiting operations on mysys layer should
be aborted (this includes waiting for table locks), was set by kill
operation but was never reset back. So this value was "inherited" by the
following statements or even other connections (which reused the same
physical thread). Such discrepancy between this variable and THD::killed
flag broke logic on SQL-layer and caused CPU and memory hogging.
This patch tries to fix this problem by properly resetting this member.
There is no test-case associated with this patch since it is hard to test
for memory/CPU hogging conditions in our test-suite.
sql/mysqld.cc:
We should not forget to reset THD::mysys_var::abort after kill operation
if we are going to use thread to which this operation was applied for
handling of other connections.
sql/sp_head.cc:
We should not forget to reset THD::mysys_var::abort after kill operation
if we are going to use thread to which this operation was applied for
handling of further statements.
sql/sql_parse.cc:
We should not forget to reset THD::mysys_var::abort after kill operation
if we are going to use thread to which this operation was applied for
handling of further statements.
TABLE ... WRITE".
CPU hogging occured when connection which had to wait for table lock was
serviced by thread which previously serviced connection that was killed
(note that connections can reuse threads if thread cache is enabled).
One possible scenario which exposed this problem was when thread which
provided binlog dump to replication slave was implicitly/automatically
killed when the same slave reconnected and started pulling data through
different thread/connection.
In 5.* versions memory hogging was added to CPU hogging. Moreover in
those versions the problem also occured when one killed particular query
in connection (using KILL QUERY) and later this connection had to wait for
some table lock.
This problem was caused by the fact that thread-specific mysys_var::abort
variable, which indicates that waiting operations on mysys layer should
be aborted (this includes waiting for table locks), was set by kill
operation but was never reset back. So this value was "inherited" by the
following statements or even other connections (which reused the same
physical thread). Such discrepancy between this variable and THD::killed
flag broke logic on SQL-layer and caused CPU and memory hogging.
This patch tries to fix this problem by properly resetting this member.
There is no test-case associated with this patch since it is hard to test
for memory/CPU hogging conditions in our test-suite.
sql/mysqld.cc:
We should not forget to reset THD::mysys_var::abort after kill operation
if we are going to use thread to which this operation was applied for
handling of other connections.
into mysql.com:/home/kent/bk/tmp/mysql-5.1-build
configure.in:
Auto merged
storage/ndb/src/ndbapi/NdbBlob.cpp:
Auto merged
storage/ndb/test/ndbapi/testBlobs.cpp:
Auto merged
The previous two patches for this bug worked together so that
no permanent table was memory mapped. The first patch tried to
avoid mapping while a table is in use. It allowed mapping only
if there was exactly one lock on the table, assuming that the
calling thread owned it. During mi_open(), a different call to
memory mapping was coded, which did not have this limitation.
The second patch tried to remove the code duplication and just
called mi_extra() from mi_open() an thus inherited the limitation.
But on open, a thread does not have a lock on the table...
A possible solution would be to check for zero or one lock.
But since I learned that it is safe to memory map a file while
normal file I/O is done on it, I removed the restriction altogether
and allow to memory map while a table is in use.
No test case. I do not see a chance to verify with the test suite
which kind of I/O is used on a table.
storage/myisam/mi_extra.c:
Bug#25460 - High concurrency MyISAM access causes severe mysqld crash.
Allow to memory map while table is in use.
into mysql.com:/home/svoj/devel/mysql/BUG26881/mysql-5.1-engines
mysql-test/r/merge.result:
Auto merged
mysql-test/t/merge.test:
Auto merged
sql/sql_parse.cc:
Auto merged
storage/myisam/ha_myisam.cc:
Auto merged
storage/myisam/mi_create.c:
Auto merged
into mysql.com:/home/svoj/devel/mysql/BUG26881/mysql-5.0-engines
myisam/mi_create.c:
Auto merged
mysql-test/t/merge.test:
Auto merged
sql/ha_myisam.cc:
Auto merged
sql/sql_parse.cc:
Use local.
mysql-test/r/merge.result:
SCCS merged
differences in tables
Certain merge tables were wrongly reported as having incorrect definition:
- Some fields that are 1 byte long (e.g. TINYINT, CHAR(1)), might
be internally casted (in certain cases) to a different type on a
storage engine layer. (affects 4.1 and up)
- If tables in a merge (and a MERGE table itself) had short VARCHAR column (less
than 4 bytes) and at least one (but not all) tables were ALTER'ed (even to an
identical table: ALTER TABLE xxx ENGINE=yyy), table definitions went ouf of
sync. (affects 4.1 only)
This is fixed by relaxing a check for underlying conformance and setting
field type to FIELD_TYPE_STRING in case varchar is shorter than 4
when a table is created.
myisam/mi_create.c:
Added a comment.
mysql-test/r/merge.result:
A test case for bug#26881.
mysql-test/t/merge.test:
A test case for bug#26881.
sql/ha_myisam.cc:
Relaxed some checks performed by check_definition():
As comparing of fulltext keys (and key segments) is not yet implemented,
only return an error in case one of keys is fulltext and other is not.
Otherwise, if both keys are fulltext, accept them as is.
As comparing of spatial keys (and key segments) is not yet implemented,
only return an error in case one of keys is spatial and other is not.
Otherwise, if both keys are spatial, accept them as is.
A workaround to handle situation when field is casted from FIELD_SKIP_ZERO
to FIELD_NORMAL. This could happen only in case field length is 1 and row
format is fixed.
sql/sql_parse.cc:
When a table that has varchar field shorter than 4 is created, field type is
set to FIELD_TYPE_VAR_STRING. Later, when a table is modified using alter
table, field type is changed to FIELD_TYPE_STRING (see Field_string::type).
That means HA_OPTION_PACK_RECORD flag might be lost and thus null_bit might
be shifted by alter table, in other words alter table doesn't create 100%
equal table definition.
This is usually not a problem, since when a table is created/altered,
definition on a storage engine layer is based on one that is passed from
sql layer. But it is a problem for merge engine - null_bit is shifted when
a table (merge or underlying) is altered.
Set field type to FIELD_TYPE_STRING in case FIELD_TYPE_VAR_STRING is shorter
than 4 when a table is created as it is done in Field::type.
into mysql.com:/home/kent/bk/tmp/mysql-5.1-build
configure.in:
Auto merged
mysys/Makefile.am:
Auto merged
BitKeeper/deleted/.del-mysys.dsp~32695fee91189326:
Auto merged
BitKeeper/deleted/.del-mysys.vcproj~40a49d09c4184822:
Auto merged
BitKeeper/deleted/.del-mysys_ia64.dsp~7a98bd8cd01d3043:
Auto merged
into mysql.com:/home/kent/bk/tmp/mysql-5.0-build
VC++Files/mysys/mysys.vcproj:
Auto merged
VC++Files/mysys/mysys_ia64.dsp:
Auto merged
mysys/Makefile.am:
Auto merged
BitKeeper/deleted/.del-my_semaphore.c:
Auto merged
VC++Files/mysys/mysys.dsp:
SCCS merged
