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Merge "taskprocessors: Implement high/low water mark alerts." into 13

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This commit is contained in:
zuul
2016-06-09 20:12:30 -05:00
committed by Gerrit Code Review
parent 2204a6e6f1 610eee2a36
commit 1ac47c5aae
3 changed files with 177 additions and 58 deletions
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38
res/res_pjsip/pjsip_distributor.c
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@@ -369,8 +369,6 @@ static pjsip_module endpoint_mod = {
.on_rx_request = endpoint_lookup,
};
#define SIP_MAX_QUEUE (AST_TASKPROCESSOR_HIGH_WATER_LEVEL * 3)
static pj_bool_t distributor(pjsip_rx_data *rdata)
{
pjsip_dialog *dlg;
@@ -408,6 +406,13 @@ static pj_bool_t distributor(pjsip_rx_data *rdata)
pjsip_rx_data_get_info(rdata));
serializer = find_request_serializer(rdata);
if (!serializer) {
if (ast_taskprocessor_alert_get()) {
/* We're overloaded, ignore the unmatched response. */
ast_debug(3, "Taskprocessor overload alert: Ignoring unmatched '%s'.\n",
pjsip_rx_data_get_info(rdata));
return PJ_TRUE;
}
/*
* Pick a serializer for the unmatched response. Maybe
* the stack can figure out what it is for, or we really
@@ -422,6 +427,21 @@ static pj_bool_t distributor(pjsip_rx_data *rdata)
PJSIP_SC_CALL_TSX_DOES_NOT_EXIST, NULL, NULL, NULL);
return PJ_TRUE;
} else {
if (ast_taskprocessor_alert_get()) {
/*
* When taskprocessors get backed up, there is a good chance that
* we are being overloaded and need to defer adding new work to
* the system. To defer the work we will ignore the request and
* rely on the peer's transport layer to retransmit the message.
* We usually work off the overload within a few seconds. The
* alternative is to send back a 503 response to these requests
* and be done with it.
*/
ast_debug(3, "Taskprocessor overload alert: Ignoring '%s'.\n",
pjsip_rx_data_get_info(rdata));
return PJ_TRUE;
}
/* Pick a serializer for the out-of-dialog request. */
serializer = ast_sip_get_distributor_serializer(rdata);
}
@@ -432,21 +452,9 @@ static pj_bool_t distributor(pjsip_rx_data *rdata)
clone->endpt_info.mod_data[endpoint_mod.id] = ao2_bump(dist->endpoint);
}
if (ast_sip_threadpool_queue_size() > SIP_MAX_QUEUE) {
/* When the threadpool is backed up this much, there is a good chance that we have encountered
* some sort of terrible condition and don't need to be adding more work to the threadpool.
* It's in our best interest to send back a 503 response and be done with it.
*/
if (rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) {
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 503, NULL, NULL, NULL);
}
if (ast_sip_push_task(serializer, distribute, clone)) {
ao2_cleanup(clone->endpt_info.mod_data[endpoint_mod.id]);
pjsip_rx_data_free_cloned(clone);
} else {
if (ast_sip_push_task(serializer, distribute, clone)) {
ao2_cleanup(clone->endpt_info.mod_data[endpoint_mod.id]);
pjsip_rx_data_free_cloned(clone);
}
}
ast_taskprocessor_unreference(serializer);