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author | Teemu Ollakka <teemu.ollakka@galeracluster.com> | 2019-08-30 08:42:24 +0300 |
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committer | Jan Lindström <jan.lindstrom@mariadb.com> | 2019-08-30 08:42:24 +0300 |
commit | 9487e0b259e7f410f5f93ae59851be60d6a5112c (patch) | |
tree | b14b034f20d585f0073a9ff5b3e4107d0da4628f /sql/sql_connect.cc | |
parent | d22f8c459ff107018b6330959b8c454435f2827e (diff) | |
download | mariadb-git-9487e0b259e7f410f5f93ae59851be60d6a5112c.tar.gz |
MDEV-19826 10.4 seems to crash with "pool-of-threads" (#1370)
MariaDB 10.4 was crashing when thread-handling was set to
pool-of-threads and wsrep was enabled.
There were two apparent reasons for the crash:
- Connection handling in threadpool_common.cc was missing calls to
control wsrep client state.
- Thread specific storage which contains thread variables (THR_KEY_mysys)
was not handled appropriately by wsrep patch when pool-of-threads
was configured.
This patch addresses the above issues in the following way:
- Wsrep client state open/close was moved in thd_prepare_connection() and
end_connection() to have common handling for one-thread-per-connection
and pool-of-threads.
- Thread local storage handling in wsrep patch was reworked by introducing
set of wsrep_xxx_threadvars() calls which replace calls to
THD store_globals()/reset_globals() and deal with thread handling
specifics internally.
Wsrep-lib was updated to version which relaxes internal concurrency
related sanity checks.
Rollback code from wsrep_rollback_process() was extracted to separate calls
for better readability.
Post rollback thread was removed as it was completely unused.
Diffstat (limited to 'sql/sql_connect.cc')
-rw-r--r-- | sql/sql_connect.cc | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc index b8fff8c864a..6bf43d3df5e 100644 --- a/sql/sql_connect.cc +++ b/sql/sql_connect.cc @@ -1188,6 +1188,16 @@ void end_connection(THD *thd) { NET *net= &thd->net; +#ifdef WITH_WSREP + if (thd->wsrep_cs().state() == wsrep::client_state::s_exec) + { + /* Error happened after the thread acquired ownership to wsrep + client state, but before command was processed. Clean up the + state before wsrep_close(). */ + wsrep_after_command_ignore_result(thd); + } + wsrep_close(thd); +#endif /* WITH_WSREP */ if (thd->user_connect) { /* @@ -1321,6 +1331,7 @@ bool thd_prepare_connection(THD *thd) prepare_new_connection_state(thd); #ifdef WITH_WSREP thd->wsrep_client_thread= true; + wsrep_open(thd); #endif /* WITH_WSREP */ return FALSE; } @@ -1393,9 +1404,6 @@ void do_handle_one_connection(CONNECT *connect) create_user= FALSE; goto end_thread; } -#ifdef WITH_WSREP - wsrep_open(thd); -#endif /* WITH_WSREP */ while (thd_is_connection_alive(thd)) { @@ -1406,10 +1414,6 @@ void do_handle_one_connection(CONNECT *connect) } end_connection(thd); -#ifdef WITH_WSREP - wsrep_close(thd); -#endif /* WITH_WSREP */ - end_thread: close_connection(thd); |