into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  trift2.:/MySQL/M51/mysql-5.1

into  mysql.com:/home/svoj/devel/bk/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/bk/mysql-5.0-engines

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.1-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mockturtle.local:/home/dlenev/src/mysql-4.1-merge

into  mockturtle.local:/home/dlenev/src/mysql-5.0-merge

into  mockturtle.local:/home/dlenev/src/mysql-5.1-bg25966

into  mockturtle.local:/home/dlenev/src/mysql-5.0-bg25966-2

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.

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.

into  mockturtle.local:/home/dlenev/src/mysql-5.1-bg25966

into  mysql.com:/home/kent/bk/tmp/mysql-5.1-build

into  mysql.com:/home/kent/bk/tmp/mysql-5.0-build

into  mysql.com:/home/kent/bk/tmp/mysql-4.1-build

  Updated to version 0.6 of the text

into  magare.gmz:/home/kgeorge/mysql/autopush/B26794-merge-5.1-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B26794-merge-5.1-opt

into  mysql.com:/home/kent/bk/tmp/mysql-5.1-build

into  mysql.com:/home/kent/bk/tmp/mysql-5.1-build

into  mysql.com:/home/kent/bk/tmp/mysql-5.0-build

into  mysql.com:/home/kent/bk/tmp/mysql-5.0-build

into  mysql.com:/home/kent/bk/tmp/mysql-4.1-build

into  mysql.com:/home/kent/bk/tmp/mysql-4.1-build

  Added test for sched_yield() possibly in -lposix4 on Solaris

into  dl145s.mysql.com:/users/mhansson/mysql/autopush/5.1o-bug24778