这个是我自己的笔记没有阅读性。也没仔细看。但是记录下断点以后好研究。
朋友遇到这个错修改了参数
| table_definition_cache | 1400 |
| table_open_cache | 2000 |
均设置为16384就好了。
但是他搞不明白有什么关系。我就看了一下这个报错的错误码
{ "ER_NEED_REPREPARE", 1615, "Prepared statement needs to be re-prepared" },
分析后他应该是在函数check_and_update_table_version中抛出来的。
其注释有
Compare metadata versions of an element obtained from the table
definition cache and its corresponding node in the parse tree.
其逻辑有
static bool
check_and_update_table_version(THD *thd,
TABLE_LIST *tables, TABLE_SHARE *table_share)
{
if (! tables->is_table_ref_id_equal(table_share))
{
Reprepare_observer *reprepare_observer= thd->get_reprepare_observer();
if (reprepare_observer &&
reprepare_observer->report_error(thd)) //这里如果前面的指针为NULL则触发这个报错逻辑
{
/*
Version of the table share is different from the
previous execution of the prepared statement, and it is
unacceptable for this SQLCOM. Error has been reported.
*/
DBUG_ASSERT(thd->is_error());
return TRUE;
}
/* Always maintain the latest version and type */
tables->set_table_ref_id(table_share);
}
DBUG_EXECUTE_IF("reprepare_each_statement", return inject_reprepare(thd););
return FALSE;
}
看来他们确实有联系，但是怎么联系的说不上来，这个观察者搞毛线的我也不知道。以后再说。
断点设置
1 breakpoint keep y 0x0000000000ebd5f3 in main(int, char**) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/main.cc:25
breakpoint already hit 1 time
4 breakpoint keep y 0x00000000016a04bd in open_table_from_share(THD*, TABLE_SHARE*, char const*, uint, uint, uint, TABLE*, bool)
at /root/mysql5.7.14/percona-server-5.7.14-7/sql/table.cc:3038
breakpoint already hit 4 times
5 breakpoint keep y 0x0000000001519a10 in check_and_update_table_version(THD*, TABLE_LIST*, TABLE_SHARE*)
at /root/mysql5.7.14/percona-server-5.7.14-7/sql/sql_base.cc:4219
breakpoint already hit 4 times
6 breakpoint keep y 0x00000000015285bb in Table_cache::add_used_table(THD*, TABLE*) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/table_cache.h:353
breakpoint already hit 2 times
7 breakpoint keep y 0x0000000001527427 in TABLE_LIST::set_table_ref_id(enum_table_ref_type, ulonglong)
at /root/mysql5.7.14/percona-server-5.7.14-7/sql/table.h:2100
8 breakpoint keep y 0x00000000015273e3 in TABLE_LIST::set_table_ref_id(TABLE_SHARE*) at /root/mysql5.7.14/percona-server-5.7.14-7/sql/table.h:2095
breakpoint already hit 1 time
