MXS-3106: Always write the final COM_QUIT

This seems to help with a regression that was introduced in 2.4.11.
This commit is contained in:
Markus Mäkelä
2020-08-21 08:27:34 +03:00
parent b90d42b999
commit c5b47389df
5 changed files with 11 additions and 15 deletions

View File

@ -206,6 +206,11 @@ struct DCB : public MXB_POLL_DATA
bool high_water_reached = false; /** High water mark reached, to determine whether we need to bool high_water_reached = false; /** High water mark reached, to determine whether we need to
* release * release
* throttle */ * throttle */
// Enable this to prevent write errors from being logged. Helps reduce false errors when writes to
// potentially closed DCBs are done.
bool silence_write_errors = false;
struct struct
{ {
DCB* next = nullptr; /**< Next DCB in owning thread's list */ DCB* next = nullptr; /**< Next DCB in owning thread's list */

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@ -340,7 +340,6 @@ typedef struct
bool collect_result; /*< Collect the next result set as one buffer */ bool collect_result; /*< Collect the next result set as one buffer */
bool changing_user; bool changing_user;
bool track_state; /*< Track session state */ bool track_state; /*< Track session state */
bool send_com_quit;
uint32_t num_eof_packets; /*< Encountered eof packet number, used for check uint32_t num_eof_packets; /*< Encountered eof packet number, used for check
* packet type */ * packet type */
bool large_query; /*< Whether to ignore the command byte of the next bool large_query; /*< Whether to ignore the command byte of the next

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@ -822,7 +822,7 @@ static int dcb_log_errors_SSL(DCB* dcb, int ret)
unsigned long ssl_errno; unsigned long ssl_errno;
ssl_errno = ERR_get_error(); ssl_errno = ERR_get_error();
if (0 == ssl_errno) if (0 == ssl_errno || dcb->silence_write_errors)
{ {
return 0; return 0;
} }
@ -1806,7 +1806,8 @@ static int gw_write(DCB* dcb, GWBUF* writeq, bool* stop_writing)
if (written < 0) if (written < 0)
{ {
*stop_writing = true; *stop_writing = true;
if (saved_errno != EAGAIN && saved_errno != EWOULDBLOCK && saved_errno != EPIPE) if (saved_errno != EAGAIN && saved_errno != EWOULDBLOCK && saved_errno != EPIPE
&& !dcb->silence_write_errors)
{ {
MXS_ERROR("Write to %s %s in state %s failed: %d, %s", MXS_ERROR("Write to %s %s in state %s failed: %d, %s",
dcb->type(), dcb->type(),

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@ -1291,12 +1291,6 @@ static int gw_MySQLWrite_backend(DCB* dcb, GWBUF* queue)
} }
else else
{ {
if (cmd == MXS_COM_QUIT)
{
backend_protocol->send_com_quit = false;
}
if (GWBUF_IS_IGNORABLE(queue)) if (GWBUF_IS_IGNORABLE(queue))
{ {
/** The response to this command should be ignored */ /** The response to this command should be ignored */
@ -1409,11 +1403,9 @@ static int gw_backend_close(DCB* dcb)
mxb_assert(dcb->session || dcb->persistentstart); mxb_assert(dcb->session || dcb->persistentstart);
MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol; MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
if (proto->send_com_quit && proto->protocol_auth_state == MXS_AUTH_STATE_COMPLETE) // Always send a COM_QUIT to the backend being closed. This causes the connection to be closed faster.
{ dcb->silence_write_errors = true;
// Send a COM_QUIT to the backend being closed, we haven't routed one to it yet. dcb_write(dcb, mysql_create_com_quit(NULL, 0));
dcb_write(dcb, mysql_create_com_quit(NULL, 0));
}
/** Free protocol data */ /** Free protocol data */
mysql_protocol_done(dcb); mysql_protocol_done(dcb);

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@ -64,7 +64,6 @@ MySQLProtocol* mysql_protocol_init(DCB* dcb, int fd)
p->num_eof_packets = 0; p->num_eof_packets = 0;
p->large_query = false; p->large_query = false;
p->track_state = false; p->track_state = false;
p->send_com_quit = true;
/*< Assign fd with protocol */ /*< Assign fd with protocol */
p->fd = fd; p->fd = fd;
p->owner_dcb = dcb; p->owner_dcb = dcb;