AshinGau commented on code in PR #30746:
URL: https://github.com/apache/doris/pull/30746#discussion_r1477978094
##########
be/src/vec/exec/scan/scanner_scheduler.cpp:
##########
@@ -139,155 +117,107 @@ Status ScannerScheduler::init(ExecEnv* env) {
return Status::OK();
}
-Status ScannerScheduler::submit(std::shared_ptr<ScannerContext> ctx) {
+void ScannerScheduler::submit(std::shared_ptr<ScannerContext> ctx,
+ std::shared_ptr<ScanTask> scan_task) {
+ scan_task->last_submit_time = GetCurrentTimeNanos();
if (ctx->done()) {
- return Status::EndOfFile("ScannerContext is done");
- }
- ctx->queue_idx = (_queue_idx++ % QUEUE_NUM);
- if (!_pending_queues[ctx->queue_idx]->blocking_put(ctx)) {
- return Status::InternalError("failed to submit scanner context to
scheduler");
- }
- return Status::OK();
-}
-
-std::unique_ptr<ThreadPoolToken> ScannerScheduler::new_limited_scan_pool_token(
- ThreadPool::ExecutionMode mode, int max_concurrency) {
- return _limited_scan_thread_pool->new_token(mode, max_concurrency);
-}
-
-void ScannerScheduler::_schedule_thread(int queue_id) {
- BlockingQueue<std::shared_ptr<ScannerContext>>* queue =
_pending_queues[queue_id];
- while (!_is_closed) {
- std::shared_ptr<ScannerContext> ctx;
- bool ok = queue->blocking_get(&ctx);
- if (!ok) {
- // maybe closed
- continue;
- }
-
- _schedule_scanners(ctx);
- // If ctx is done, no need to schedule it again.
- // But should notice that there may still scanners running in scanner
pool.
+ scan_task->set_status(Status::EndOfFile("ScannerContext is done"));
+ ctx->append_block_to_queue(scan_task);
+ return;
}
-}
-
-void ScannerScheduler::_schedule_scanners(std::shared_ptr<ScannerContext> ctx)
{
auto task_lock = ctx->task_exec_ctx();
if (task_lock == nullptr) {
LOG(INFO) << "could not lock task execution context, query " <<
ctx->debug_string()
<< " maybe finished";
- return;
- }
- MonotonicStopWatch watch;
- watch.reset();
- watch.start();
- ctx->incr_num_ctx_scheduling(1);
-
- if (ctx->done()) {
+ ctx->append_block_to_queue(scan_task);
return;
}
- std::list<std::weak_ptr<ScannerDelegate>> this_run;
- ctx->get_next_batch_of_scanners(&this_run);
- if (this_run.empty()) {
- // There will be 2 cases when this_run is empty:
- // 1. The blocks queue reaches limit.
- // The consumer will continue scheduling the ctx.
- // 2. All scanners are running.
- // There running scanner will schedule the ctx after they are
finished.
- // So here we just return to stop scheduling ctx.
- return;
- }
-
- ctx->inc_num_running_scanners(this_run.size());
-
// Submit scanners to thread pool
// TODO(cmy): How to handle this "nice"?
int nice = 1;
- auto iter = this_run.begin();
if (ctx->thread_token != nullptr) {
- // TODO llj tg how to treat this?
- while (iter != this_run.end()) {
- std::shared_ptr<ScannerDelegate> scanner_delegate = (*iter).lock();
- if (scanner_delegate == nullptr) {
- // Has to ++, or there is a dead loop
- iter++;
- continue;
- }
- scanner_delegate->_scanner->start_wait_worker_timer();
- auto s = ctx->thread_token->submit_func([this, scanner_ref =
*iter, ctx]() {
- this->_scanner_scan(this, ctx, scanner_ref);
- });
- if (s.ok()) {
- iter++;
- } else {
- ctx->set_status_on_error(s);
- break;
- }
+ std::shared_ptr<ScannerDelegate> scanner_delegate =
scan_task->scanner.lock();
+ if (scanner_delegate == nullptr) {
Review Comment:
Every submitted ScanTask should append back to ScannerContext in any cases.
This is the design rule of this new API.
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