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Move responsibility for closing DCB on error to router error handling. Check that routers remove or disable links to closed DCB.

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This commit is contained in:
counterpoint
2015-09-09 09:33:00 +01:00
parent 2e50dfd484
commit f6916a23bd
10 changed files with 89 additions and 85 deletions
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1
server/core/dcb.c
View File

@ -55,6 +55,7 @@
* fixes for various error situations,
* remove dcb_set_state etc, simplifications.
* 10/07/2015 Martin Brampton Simplify, merge dcb_read and dcb_read_n
* 04/09/2015 Martin Brampton Changes to ensure DCB always has session pointer
*
* @endverbatim
*/

3
server/core/poll.c
View File

@ -74,8 +74,7 @@ int max_poll_sleep;
* thread utilisation and fairer scheduling of the event
* processing.
* 07/07/15 Martin Brampton Simplified add and remove DCB, improve error handling.
* 23/08/15 Martin Brampton Provisionally added test so only DCB with a
* session link can be added to the poll list
* 23/08/15 Martin Brampton Added test so only DCB with a session link can be added to the poll list
*
* @endverbatim
*/

8
server/modules/protocol/mysql_backend.c
View File

@ -415,7 +415,6 @@ static int gw_read_backend_event(DCB *dcb) {
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
ss_dassert(dcb->dcb_errhandle_called);
dcb_close(dcb);
rc = 1;
goto return_rc;
}
@ -488,8 +487,6 @@ static int gw_read_backend_event(DCB *dcb) {
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
ss_dassert(dcb->dcb_errhandle_called);
dcb_close(dcb);
rc = 0;
goto return_rc;
}
@ -912,8 +909,6 @@ static int gw_error_backend_event(DCB *dcb)
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
ss_dassert(dcb->dcb_errhandle_called);
dcb_close(dcb);
retblock:
return 1;
@ -1144,7 +1139,6 @@ gw_backend_hangup(DCB *dcb)
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
ss_dassert(dcb->dcb_errhandle_called);
retblock:
return 1;
@ -1324,8 +1318,6 @@ static int backend_write_delayqueue(DCB *dcb)
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
ss_dassert(dcb->dcb_errhandle_called);
dcb_close(dcb);
}
}
}

4
server/modules/protocol/mysql_client.c
View File

@ -39,6 +39,8 @@
* 10/11/2014 Massimiliano Pinto Added: client charset added to protocol struct
* 29/05/2015 Markus Makela Added SSL support
* 11/06/2015 Martin Brampton COM_QUIT suppressed for persistent connections
* 04/09/2015 Martin Brampton Introduce DUMMY session to fulfill guarantee DCB always has session
* 09/09/2015 Martin Brampton Modify error handler calls
*/
#include <skygw_utils.h>
#include <log_manager.h>
@ -813,7 +815,6 @@ int gw_read_client_event(
LOGFILE_ERROR,
"Error : Routing the query failed. "
"Session will be closed.")));
dcb_close(dcb);
}
rc = 1;
goto return_rc;
@ -1192,7 +1193,6 @@ int gw_read_client_event(
"Error : Routing the query failed. "
"Session will be closed.")));
dcb_close(dcb);
}
}
}

3
server/modules/routing/binlog/blr.c
View File

@ -37,7 +37,7 @@
* 18/02/2015 Massimiliano Pinto Addition of dcb_close in closeSession
* 07/05/2015 Massimiliano Pinto Addition of MariaDB 10 compatibility support
* 12/06/2015 Massimiliano Pinto Addition of MariaDB 10 events in diagnostics()
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/
@ -1114,6 +1114,7 @@ char msg[85], *errmsg;
if (errmsg)
free(errmsg);
*succp = true;
dcb_close(backend_dcb);
LOGIF(LM, (skygw_log_write_flush(
LOGFILE_MESSAGE,
"%s: Master %s disconnected after %ld seconds. "

2
server/modules/routing/maxinfo/maxinfo.c
View File

@ -26,6 +26,7 @@
* Date Who Description
* 16/02/15 Mark Riddoch Initial implementation
* 27/02/15 Massimiliano Pinto Added maxinfo_add_mysql_user
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/
@ -335,6 +336,7 @@ static void handleError(
}
/** false because connection is not available anymore */
dcb_close(backend_dcb);
*succp = false;
}

3
server/modules/routing/readconnroute.c
View File

@ -67,7 +67,8 @@
* 06/03/2014 Massimiliano Pinto Server connection counter is now updated in closeSession
* 24/06/2014 Massimiliano Pinto New rules for selecting the Master server
* 27/06/2014 Mark Riddoch Addition of server weighting
* 11/06/2015 Martin Brampton Remove decrement n_current (moved to dcb.c)
* 11/06/2015 Martin Brampton Remove decrement n_current (moved to dcb.c)
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/

28
server/modules/routing/readwritesplit/readwritesplit.c
View File

@ -67,6 +67,8 @@ extern __thread log_info_t tls_log_info;
* 18/07/2013 Massimiliano Pinto routeQuery now handles COM_QUIT
* as QUERY_TYPE_SESSION_WRITE
* 17/07/2014 Massimiliano Pinto Server connection counter is updated in closeSession
*
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/
@ -4825,17 +4827,14 @@ static void handleError (
CHK_DCB(backend_dcb);
/** Reset error handle flag from a given DCB */
if (action == ERRACT_RESET)
{
backend_dcb->dcb_errhandle_called = false;
return;
}
/** Don't handle same error twice on same DCB */
if (backend_dcb->dcb_errhandle_called)
{
/** we optimistically assume that previous call succeed */
/** we optimistically assume that previous call succeed */
/*
* The return of true is potentially misleading, but appears to
* be safe with the code as it stands on 9 Sept 2015 - MNB
*/
*succp = true;
return;
}
@ -4848,12 +4847,13 @@ static void handleError (
if (session == NULL || rses == NULL)
{
*succp = false;
return;
}
CHK_SESSION(session);
CHK_CLIENT_RSES(rses);
else
{
CHK_SESSION(session);
CHK_CLIENT_RSES(rses);
switch (action) {
switch (action) {
case ERRACT_NEW_CONNECTION:
{
SERVER* srv;
@ -4861,7 +4861,7 @@ static void handleError (
if (!rses_begin_locked_router_action(rses))
{
*succp = false;
return;
break;
}
srv = rses->rses_master_ref->bref_backend->backend_server;
/**
@ -4914,7 +4914,9 @@ static void handleError (
default:
*succp = false;
break;
}
}
dcb_close(backend_dcb);
}

60
server/modules/routing/schemarouter/schemarouter.c
View File

@ -58,6 +58,7 @@ extern __thread log_info_t tls_log_info;
*
* Date Who Description
* 01/12/2014 Vilho Raatikka/Markus Mäkelä Initial implementation
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/
@ -4103,37 +4104,38 @@ return_succp:
* tell whether router has enough master/slave connections to continue work.
*/
static void handleError (
ROUTER* instance,
void* router_session,
GWBUF* errmsgbuf,
DCB* backend_dcb,
error_action_t action,
bool* succp)
ROUTER* instance,
void* router_session,
GWBUF* errmsgbuf,
DCB* backend_dcb,
error_action_t action,
bool* succp)
{
SESSION* session;
ROUTER_INSTANCE* inst = (ROUTER_INSTANCE *)instance;
ROUTER_CLIENT_SES* rses = (ROUTER_CLIENT_SES *)router_session;
SESSION* session;
ROUTER_INSTANCE* inst = (ROUTER_INSTANCE *)instance;
ROUTER_CLIENT_SES* rses = (ROUTER_CLIENT_SES *)router_session;
CHK_DCB(backend_dcb);
CHK_DCB(backend_dcb);
/** Don't handle same error twice on same DCB */
if (backend_dcb->dcb_errhandle_called)
{
/** we optimistically assume that previous call succeed */
*succp = true;
return;
}
else
{
backend_dcb->dcb_errhandle_called = true;
}
session = backend_dcb->session;
/** Don't handle same error twice on same DCB */
if (backend_dcb->dcb_errhandle_called)
{
/** we optimistically assume that previous call succeed */
*succp = true;
return;
}
else
{
backend_dcb->dcb_errhandle_called = true;
}
session = backend_dcb->session;
if (session == NULL || rses == NULL)
{
*succp = false;
return;
}
if (session == NULL || rses == NULL)
{
*succp = false;
}
else
{
CHK_SESSION(session);
CHK_CLIENT_RSES(rses);
@ -4143,7 +4145,7 @@ static void handleError (
if (!rses_begin_locked_router_action(rses))
{
*succp = false;
return;
break;
}
/**
* This is called in hope of getting replacement for
@ -4171,6 +4173,8 @@ static void handleError (
*succp = false;
break;
}
}
dcb_close(backend_dcb);
}

62
server/modules/routing/schemarouter/shardrouter.c
View File

@ -63,6 +63,7 @@ extern __thread log_info_t tls_log_info;
*
* Date Who Description
* 20/01/2015 Markus Mäkelä/Vilho Raatikka Initial implementation
* 09/09/2015 Martin Brampton Modify error handler
*
* @endverbatim
*/
@ -2826,38 +2827,39 @@ handleError(
if(session == NULL || rses == NULL)
{
if(succp)
*succp = false;
return;
}
CHK_SESSION(session);
CHK_CLIENT_RSES(rses);
switch(action)
{
case ERRACT_NEW_CONNECTION:
{
if(!rses_begin_locked_router_action(rses))
{
*succp = false;
return;
}
rses_end_locked_router_action(rses);
break;
}
case ERRACT_REPLY_CLIENT:
{
*succp = false; /*< no new backend servers were made available */
break;
}
default:
*succp = false;
break;
}
else
{
CHK_SESSION(session);
CHK_CLIENT_RSES(rses);
switch(action)
{
case ERRACT_NEW_CONNECTION:
{
if(!rses_begin_locked_router_action(rses))
{
*succp = false;
break;
}
rses_end_locked_router_action(rses);
break;
}
case ERRACT_REPLY_CLIENT:
{
*succp = false; /*< no new backend servers were made available */
break;
}
default:
*succp = false;
break;
}
}
dcb_close(backend_dcb);
}