caiconghui commented on a change in pull request #5111:
URL: https://github.com/apache/incubator-doris/pull/5111#discussion_r548850976
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File path: be/src/exec/olap_scan_node.cpp
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@@ -1250,12 +1250,25 @@ void OlapScanNode::transfer_thread(RuntimeState* state)
{
state->resource_pool()->release_thread_token(true);
VLOG(1) << "TransferThread finish.";
- std::unique_lock<std::mutex> l(_row_batches_lock);
- _transfer_done = true;
+ {
+ std::unique_lock<std::mutex> l(_row_batches_lock);
+ _transfer_done = true;
+ }
_row_batch_added_cv.notify_all();
+
+ std::unique_lock<std::mutex> l(_scan_batches_lock);
+ while (_running_thread != 0) {
Review comment:
Is it better to use C++11 promise and future to instead of checking
_running_thread == 0? every scanner_thread just need to set its promise value
when finish task with lock free, and close OlapScanNode close just need to wait
all scanner_thread return future result ?
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