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Revert "nghttpx: Use an existing h2 backend connection as much as possible" 

This reverts commit f507b5eee4.

Balancing load is more important at the moment.
This commit is contained in:
Tatsuhiro Tsujikawa 2017-12-14 21:32:38 +09:00
parent 96df14d2ec
commit a4e27d766b
1 changed files with 47 additions and 31 deletions
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78
src/shrpx_client_handler.cc
View File

@ -804,40 +804,61 @@ bool load_lighter(const DownstreamAddr *lhs, const DownstreamAddr *rhs) {
Http2Session *ClientHandler::select_http2_session(
const std::shared_ptr<DownstreamAddrGroup> &group) {
auto &shared_addr = group->shared_addr;
auto &http2_avail_freelist = shared_addr->http2_avail_freelist;
for (auto session = http2_avail_freelist.head; session;) {
auto next = session->dlnext;
session->remove_from_freelist();
// session may be in graceful shutdown period now.
if (session->max_concurrency_reached(0)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this)
<< "Maximum streams have been reached for Http2Session(" << session
<< "). Skip it";
}
session = next;
// First count the working backend addresses.
size_t min = 0;
for (const auto &addr : shared_addr->addrs) {
if (addr.proto != PROTO_HTTP2 || addr.connect_blocker->blocked()) {
continue;
}
++min;
}
if (min == 0) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Use Http2Session " << session
<< " from http2_avail_freelist";
CLOG(INFO, this) << "No working backend address found";
}
if (session->max_concurrency_reached(1)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Maximum streams are reached for Http2Session("
<< session << ").";
return nullptr;
}
auto &http2_avail_freelist = shared_addr->http2_avail_freelist;
if (http2_avail_freelist.size() >= min) {
for (auto session = http2_avail_freelist.head; session;) {
auto next = session->dlnext;
session->remove_from_freelist();
// session may be in graceful shutdown period now.
if (session->max_concurrency_reached(0)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this)
<< "Maximum streams have been reached for Http2Session("
<< session << "). Skip it";
}
session = next;
continue;
}
} else {
session->add_to_avail_freelist();
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Use Http2Session " << session
<< " from http2_avail_freelist";
}
if (session->max_concurrency_reached(1)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Maximum streams are reached for Http2Session("
<< session << ").";
}
} else {
session->add_to_avail_freelist();
}
return session;
}
return session;
}
DownstreamAddr *selected_addr = nullptr;
@ -880,12 +901,7 @@ Http2Session *ClientHandler::select_http2_session(
}
}
if (selected_addr == nullptr) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "No working backend address found";
}
return nullptr;
}
assert(selected_addr);
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Selected DownstreamAddr=" << selected_addr