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MDEV-6156: Parallel replication incorrectly caches charset between worker threads

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Replication caches the character sets used in a query, to be able to quickly
reuse them for the next query in the common case of them not having changed.

In parallel replication, this caching needs to be per-worker-thread. The
code was not modified to handle this correctly, so the caching in one worker
could cause another worker to run a query using the wrong character set,
causing replication corruption.
This commit is contained in:
unknown
2014-04-23 16:06:06 +02:00
parent f9e5f237f0
commit 010971a761
7 changed files with 186 additions and 47 deletions
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3
sql/slave.h
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@@ -51,6 +51,7 @@
class Relay_log_info;
class Master_info;
class Master_info_index;
struct rpl_group_info;
struct rpl_parallel_thread;
int init_intvar_from_file(int* var, IO_CACHE* f, int default_val);
@@ -226,7 +227,7 @@ int init_relay_log_pos(Relay_log_info* rli,const char* log,ulonglong pos,
int purge_relay_logs(Relay_log_info* rli, THD *thd, bool just_reset,
const char** errmsg);
void set_slave_thread_options(THD* thd);
void set_slave_thread_default_charset(THD *thd, Relay_log_info const *rli);
void set_slave_thread_default_charset(THD *thd, rpl_group_info *rgi);
int rotate_relay_log(Master_info* mi);
int apply_event_and_update_pos(Log_event* ev, THD* thd,
struct rpl_group_info *rgi,