CORRUPTED WHEN RUN CONCURRENTLY WITH
ISSUE: Table corruption due to concurrent queries.
Different threads running check, repair query
along with insert. Locks not properly acquired
in repair query. Rows are inserted inbetween
repair query.
SOLUTION: Mutex lock is acquired before the
repair call. Concurrent queries wont
effect the call to repair.
AND HANG IN SHOW TABLE STATUS.
ISSUE: Table corruption due to concurrent queries.
Different threads running insert and check
query leads to table corruption. Not properly locked,
rows are inserted in between check query.
SOLUTION: In check query mutex lock is acquired
for a longer time to handle concurrent
insert and check query.
NOTE: Additionally we backported the fix for CHECKSUM
issue(bug#11758979).
LEAK WITH PARTITIONED ARCHIVE TABLES
CHECK TABLE against archive table, when file descriptors
are exhausted, caused server crash.
Archive didn't handle errors when opening data file for
CHECK TABLE.
Introduce a MySQL maintainer/developer mode that enables
a set of warning options for the C/C++ compiler. This mode
is intended to help improve the overall quality of the code.
The warning options are:
C_WARNINGS="-Wall -Wextra -Wunused -Wwrite-strings -Werror"
CXX_WARNINGS="$C_WARNINGS -Wno-unused-parameter"
Since -Wall is essentially a moving target, autoconf checks
are not run with warning options enabled, in particualr -Werror.
This decision might be revisited in the future. The patch also
fixes a mistake in the makefiles, where automake CXXFLAGS would
be set to CFLAGS.
strict aliasing violations.
Essentially, the problem is that large parts of the server were
developed in simpler times (last decades, pre C99 standard) when
strict aliasing and compilers supporting such optimizations were
rare to non-existent. Thus, when compiling the server with a modern
compiler that uses strict aliasing rules to perform optimizations,
there are several places in the code that might trigger undefined
behavior.
As evinced by some recent bugs, GCC does a somewhat good of job
misoptimizing such code, but on the other hand also gives warnings
about suspicious code. One problem is that the warnings aren't
always accurate, yet we can't afford to just shut them off as we
might miss real cases. False-positive cases are aggravated mostly
by casts that are likely to trigger undefined behavior.
The solution is to start a cleanup process focused on fixing and
reducing the amount of strict-aliasing related warnings produced
by GCC and others compilers. A good deal of noise reduction can
be achieved by just removing useless casts that are product of
historical cruft and are likely to trigger undefined behavior if
dereferenced.
There was no way to repair corrupt ARCHIVE data file,
when unrecoverable data loss is inevitable.
With this fix REPAIR ... EXTENDED attempts to restore
as much rows as possible, ignoring unrecoverable data.
Normal REPAIR is still able to repair meta-data file
only.
Server crashes when accessing ARCHIVE table with missing
.ARZ file.
When opening a table, ARCHIVE didn't properly pass through
error code from lower level azopen() to higher level open()
method.
on any access
Archive engine for 5.1 (and latter) version uses a modified
version of zlib (azlib). These two version are incompatible
so a proper upgrade is needed before tables created in 5.0
can be used reliable.
This upgrade can be performed using repair. But due to lack
of test its risky to allow upgrade for now. This patch addresses
only the crashing issue. Any attempt to repair will be blocked.
Eventually repair can be allowed to run through (which will also
cause an upgrade from older version to newer) but only after a
thorough testing.
The crash occurs because SAFEMALLOC is defined for the MySQL server
but not for the Archive or Federated engines, resulting in a
parameter mismatch between the function prototype and definition
for functions using the CALLER_INFO macro.
Archive engine returns wrong values for average record length
and max data length.
With this fix they're calculated as following:
- max data length is 2 ^ 63 where large files are supported
and INT_MAX32 where this is not supported;
- average record length is data length / records in data file.
SELECT with join (not only self-join) from archive table may
return incomplete result set, when result set size exceeds
join buffer size.
The problem was that archive row counter was initialzed too
early, when ha_archive::info() method was called. Later,
when optimizer exceeds join buffer, it attempts to reuse
handler without calling ha_archive::info() again (which is
correct).
Fixed by moving row counter initialization from
ha_archive::info() to ha_archive::rnd_init().
This patch fixes compilation warning, "conversion from 'time_t' to 'ulong',
possible loss of data".
The fix is to typecast time_t to ulong before assigning it to ulong.
Backported this from 6.0-bugteam tree.
Any statement reading corrupt archive data file
(CHECK/REPAIR/SELECT/UPDATE/DELETE) may cause assertion
failure in debug builds. This assertion has been removed
and an error is returned instead.
Also fixed that CHECK/REPAIR returns vague error message
when it mets corruption in archive data file. This is
fixed by returning proper error code.
- Remove bothersome warning messages. This change focuses on the warnings
that are covered by the ignore file: support-files/compiler_warnings.supp.
- Strings are guaranteed to be max uint in length
mysql-test/t/partition.test
sql/ha_partition.cc
Bug#40954: Crash in MyISAM index code with concurrency test using partitioned tables
Problem was usage of read_range_first with an empty key.
Solution was to not to give a key if it was empty. (real author Mattias Jonsson)
storage/archive/archive_reader.c
client/mysqlslap.c
Aligned the copyright texts output from "--version" of tools, to
let internal tools be able to change them if needed.
storage/ndb/test/tools/connect.cpp
storage/ndb/test/run-test/atrt.hpp
Corrected a few GPL headers not restricted to GPL version 2
Makefile.am
Added missing --report-features to the 'test-bt-fast' target
support-files/mysql.spec.sh
Reversed the removal of the "%define license GPL" in as internal
tools depended on it
case and then select
Problem was that the archive share was using a case insensitive
charset when comparing table names
Solution was to use a case sensitive char set when the table
names are case sensitive
and allow override for binary distributions. Extend mysql_config
to print compiled-in plugin location for third-party plugins to
use. Resolves bug#31736.
ha_partition::update_create_info() just calls update_create_info
of a first partition, so only get the autoincrement maximum
of the first partition, so SHOW CREATE TABLE can show
small AUTO_INCREMENT parameters.
Fixed by implementing ha_partition::update_create_info() in a way
other handlers work.
HA_ARCHIVE:stats.auto_increment handling made consistent with other engines
table cache is full
After reading last record from freshly opened archive table
(e.g. after flush table, or if there is no room in table cache),
the table is reported as crashed.
The problem was that azio wrongly invalidated azio_stream when it
meets EOF.
