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Fix backend DCB writeq throttling

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The callbacks iterated over all threads when only the local ones must be
iterated. This prevents a deadlock from occurring when multiple threads
start throttling at the same time.

Also fixed the gwbuf_append debug assertion.
This commit is contained in:
Markus Mäkelä
2018-10-19 13:44:21 +03:00
parent 4be5d9267d
commit f461ab428e
2 changed files with 5 additions and 4 deletions
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5
server/core/buffer.cc
View File

@ -450,6 +450,9 @@ int gwbuf_compare(const GWBUF* lhs, const GWBUF* rhs)
GWBUF* gwbuf_append(GWBUF* head, GWBUF* tail)
{
mxb_assert(!head || head->owner == RoutingWorker::get_current_id());
mxb_assert(!tail || tail->owner == RoutingWorker::get_current_id());
if (!head)
{
return tail;
@ -459,8 +462,6 @@ GWBUF* gwbuf_append(GWBUF* head, GWBUF* tail)
return head;
}
mxb_assert(head->owner == RoutingWorker::get_current_id()
&& tail->owner == RoutingWorker::get_current_id());
head->tail->next = tail;
head->tail = tail->tail;

4
server/core/dcb.cc
View File

@ -3768,11 +3768,11 @@ static int downstream_throttle_callback(DCB* dcb, DCB_REASON reason, void* userd
{
if (reason == DCB_REASON_HIGH_WATER)
{
dcb_foreach(backend_dcb_remove_func, dcb->session);
dcb_foreach_local(backend_dcb_remove_func, dcb->session);
}
else if (reason == DCB_REASON_LOW_WATER)
{
dcb_foreach(backend_dcb_add_func, dcb->session);
dcb_foreach_local(backend_dcb_add_func, dcb->session);
}
return 0;