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[BugFix] Fix transaction stream load lock leak #53564

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merged 2 commits into from
Dec 5, 2024
Merged

[BugFix] Fix transaction stream load lock leak #53564

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1493631
Fix lock leak
banmoy Dec 4, 2024
7384a10
Fix comments
banmoy Dec 5, 2024
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56 changes: 27 additions & 29 deletions be/src/http/action/transaction_stream_load.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <deque>
#include <future>
#include <sstream>
#include <utility>

// use string iequal
#include <event2/buffer.h>
Expand Down Expand Up @@ -144,22 +145,14 @@ void TransactionStreamLoadAction::_send_error_reply(HttpRequest* req, const Stat
}

void TransactionStreamLoadAction::handle(HttpRequest* req) {
StreamLoadContext* ctx = nullptr;
const auto& label = req->header(HTTP_LABEL_KEY);
if (!req->header(HTTP_CHANNEL_ID).empty()) {
int channel_id = std::stoi(req->header(HTTP_CHANNEL_ID));
ctx = _exec_env->stream_context_mgr()->get_channel_context(label, channel_id);
} else {
ctx = _exec_env->stream_context_mgr()->get(label);
if (config::enable_stream_load_verbose_log) {
LOG(INFO) << "transaction streaming load request, handle: " << req->debug_string();
}

StreamLoadContext* ctx = static_cast<StreamLoadContext*>(req->handler_ctx());
if (ctx == nullptr) {
return;
}
DeferOp defer([&] {
if (ctx->unref()) {
delete ctx;
}
});
ctx->last_active_ts = MonotonicNanos();

if (!ctx->status.ok()) {
Expand All @@ -179,14 +172,12 @@ void TransactionStreamLoadAction::handle(HttpRequest* req) {
}

auto resp = _exec_env->transaction_mgr()->_build_reply(TXN_LOAD, ctx);
ctx->lock.unlock();

_send_reply(req, resp);
}

int TransactionStreamLoadAction::on_header(HttpRequest* req) {
if (config::enable_stream_load_verbose_log) {
LOG(INFO) << "transaction streaming load request: " << req->debug_string();
LOG(INFO) << "transaction streaming load request, header: " << req->debug_string();
}

const auto& label = req->header(HTTP_LABEL_KEY);
Expand Down Expand Up @@ -230,6 +221,9 @@ int TransactionStreamLoadAction::on_header(HttpRequest* req) {
_send_error_reply(req, Status::TransactionInProcessing("Transaction in processing, please retry later"));
return -1;
}
// referenced by the http request
ctx->ref();
req->set_handler_ctx(ctx);
ctx->last_active_ts = MonotonicNanos();
ctx->received_data_cost_nanos = 0;
ctx->receive_bytes = 0;
Expand All @@ -243,7 +237,6 @@ int TransactionStreamLoadAction::on_header(HttpRequest* req) {
(void)_exec_env->transaction_mgr()->_rollback_transaction(ctx);
}
auto resp = _exec_env->transaction_mgr()->_build_reply(TXN_LOAD, ctx);
ctx->lock.unlock();
_send_reply(req, resp);
return -1;
}
Expand Down Expand Up @@ -501,22 +494,10 @@ Status TransactionStreamLoadAction::_exec_plan_fragment(HttpRequest* http_req, S
}

void TransactionStreamLoadAction::on_chunk_data(HttpRequest* req) {
StreamLoadContext* ctx = nullptr;
const string& label = req->header(HTTP_LABEL_KEY);
if (!req->header(HTTP_CHANNEL_ID).empty()) {
int channel_id = std::stoi(req->header(HTTP_CHANNEL_ID));
ctx = _exec_env->stream_context_mgr()->get_channel_context(label, channel_id);
} else {
ctx = _exec_env->stream_context_mgr()->get(label);
}
StreamLoadContext* ctx = static_cast<StreamLoadContext*>(req->handler_ctx());
if (ctx == nullptr) {
return;
}
DeferOp defer([&] {
if (ctx->unref()) {
delete ctx;
}
});

SCOPED_THREAD_LOCAL_MEM_TRACKER_SETTER(ctx->instance_mem_tracker.get());

Expand Down Expand Up @@ -584,6 +565,23 @@ void TransactionStreamLoadAction::on_chunk_data(HttpRequest* req) {
ctx->last_active_ts = MonotonicNanos();
ctx->received_data_cost_nanos += ctx->last_active_ts - start_read_data_time;
ctx->total_received_data_cost_nanos += ctx->last_active_ts - start_read_data_time;
VLOG(1) << "Receive http chunk, " << ctx->brief() << ", total expected bytes: " << ctx->body_bytes
<< ", total received bytes: " << ctx->total_receive_bytes;
}

void TransactionStreamLoadAction::free_handler_ctx(void* param) {
StreamLoadContext* ctx = static_cast<StreamLoadContext*>(param);
if (ctx == nullptr) {
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shall check nullptr against param before convert to StreamLoadContext?

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static_cast can be applied to nullptr so it's safe to check after the cast

return;
}
DCHECK(!ctx->lock.try_lock());
ctx->lock.unlock();
if (config::enable_stream_load_verbose_log) {
LOG(INFO) << "free handler context, " << ctx->brief();
}
if (ctx->unref()) {
delete ctx;
}
}

} // namespace starrocks
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2 changes: 2 additions & 0 deletions be/src/http/action/transaction_stream_load.h
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,8 @@ class TransactionStreamLoadAction : public HttpHandler {

void on_chunk_data(HttpRequest* req) override;

void free_handler_ctx(void* ctx) override;

private:
Status _on_header(HttpRequest* http_req, StreamLoadContext* ctx);
Status _channel_on_header(HttpRequest* http_req, StreamLoadContext* ctx);
Expand Down
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