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cluster/zeromq: Queue one message at a time

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Queueing multiple messages can easily overload the IO loop without
creating any backpressure.
This commit is contained in:
Arne Welzel 2025-01-29 15:39:26 +01:00
parent 09ccb2e250
commit 94ec3af2b0
1 changed files with 10 additions and 21 deletions
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31
src/cluster/backend/zeromq/ZeroMQ.cc
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@ -366,9 +366,6 @@ void ZeroMQBackend::Run() {
using MultipartMessage = std::vector<zmq::message_t>;
auto HandleLogMessages = [this](const std::vector<MultipartMessage>& msgs) {
QueueMessages qmsgs;
qmsgs.reserve(msgs.size());
for ( const auto& msg : msgs ) {
// sender, format, type, payload
if ( msg.size() != 4 ) {
@ -377,11 +374,11 @@ void ZeroMQBackend::Run() {
}
detail::byte_buffer payload{msg[3].data<std::byte>(), msg[3].data<std::byte>() + msg[3].size()};
qmsgs.emplace_back(LogMessage{.format = std::string(msg[2].data<const char>(), msg[2].size()),
.payload = std::move(payload)});
}
LogMessage lm{.format = std::string(msg[2].data<const char>(), msg[2].size()),
.payload = std::move(payload)};
QueueForProcessing(std::move(qmsgs));
QueueForProcessing(std::move(lm));
}
};
auto HandleInprocMessages = [this](std::vector<MultipartMessage>& msgs) {
@ -434,9 +431,6 @@ void ZeroMQBackend::Run() {
};
auto HandleXPubMessages = [this](const std::vector<MultipartMessage>& msgs) {
QueueMessages qmsgs;
qmsgs.reserve(msgs.size());
for ( const auto& msg : msgs ) {
if ( msg.size() != 1 ) {
ZEROMQ_THREAD_PRINTF("xpub: error: expected 1 part, have %zu!\n", msg.size());
@ -462,17 +456,12 @@ void ZeroMQBackend::Run() {
continue;
}
qmsgs.emplace_back(std::move(qm));
QueueForProcessing(std::move(qm));
}
}
QueueForProcessing(std::move(qmsgs));
};
auto HandleXSubMessages = [this](const std::vector<MultipartMessage>& msgs) {
QueueMessages qmsgs;
qmsgs.reserve(msgs.size());
for ( const auto& msg : msgs ) {
if ( msg.size() != 4 ) {
ZEROMQ_THREAD_PRINTF("xsub: error: expected 4 parts, have %zu!\n", msg.size());
@ -485,12 +474,12 @@ void ZeroMQBackend::Run() {
continue;
detail::byte_buffer payload{msg[3].data<std::byte>(), msg[3].data<std::byte>() + msg[3].size()};
qmsgs.emplace_back(EventMessage{.topic = std::string(msg[0].data<const char>(), msg[0].size()),
.format = std::string(msg[2].data<const char>(), msg[2].size()),
.payload = std::move(payload)});
}
EventMessage em{.topic = std::string(msg[0].data<const char>(), msg[0].size()),
.format = std::string(msg[2].data<const char>(), msg[2].size()),
.payload = std::move(payload)};
QueueForProcessing(std::move(qmsgs));
QueueForProcessing(std::move(em));
}
};
// Helper class running at destruction.