在测试mysql transfer 性能的时候遇到问题，slave 在某个偏移位置点长时间的被卡主，只要一运行stop slave 就卡住，sql_thread线程执行出现问题，在master端的操作不能有效的传递到slave端。周五下午在master上面建的表，周六才传递到slave端。

查看偏移位置的操作发现很多这种 # at ，卡住的偏移在 # at 196484929 位置

[root@localhost test2]# mysqlbinlog  -v -v -j  196484929  mysql-bin.000005 |less

# at 196484929

#130816 12:51:48 server id 2  end_log_pos 196484998     Query   thread_id=14400043      exec_time=2     error_code=0

SET TIMESTAMP=1376628708/*!*/;

SET @@session.pseudo_thread_id=14400043/*!*/;

SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;

SET @@session.sql_mode=0/*!*/;

SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;

/*!\C utf8 *//*!*/;

SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=33/*!*/;

SET @@session.lc_time_names=0/*!*/;

SET @@session.collation_database=DEFAULT/*!*/;

BEGIN

/*!*/;

# at 196484998

# at 196485054

# at 196486091

# at 196487128

# at 196488165

# at 196489202

# at 196490239

# at 196491276

# at 196492313

# at 196493350

# at 196494387

# at 196495424

# at 196496461

# at 196497498

# at 196498535

# at 196499572

# at 196500609

# at 196501646

# at 196502683

# at 196503720

# at 196504757

# at 196505794

# at 196506831

# at 196507868

# at 196508905

# at 196509942

# at 196510979

# at 196512016

# at 196513053

# at 196514090

# at 196515127

# at 196516164

# at 196517201

# at 196518238

# at 196519275

# at 196520312

# at 196521349

# at 196522386

# at 196523423

# at 196524460

# at 196525497

# at 196526534

# at 196527571

# at 196528608

# at 196529645

# at 196530682

# at 196531719

# at 196532756

# at 196533793

# at 196534830

# at 196535867

# at 196536904

# at 196537941

# at 196538978

# at 196540015

# at 196541052

# at 196542089

# at 196543126

# at 196544163

# at 196545200

# at 196546237

# at 196547274

# at 196548311

# at 196549348

# at 196550385

# at 196551422

# at 196552459

后面还有很多at

怀疑是不是这个事务的点操作太长了？

目前还不知道具体原因啊