CancelAllBackgroundWork: Flush does not wait for stall conditions to clear

Author: Yuval-Ariel

db/db_impl/db_impl.cc

@@ -550,7 +550,9 @@ void DBImpl::CancelAllBackgroundWork(bool wait) {
   if (!shutting_down_.load(std::memory_order_acquire) &&
       has_unpersisted_data_.load(std::memory_order_relaxed) &&
       !mutable_db_options_.avoid_flush_during_shutdown) {
-    s = DBImpl::FlushAllColumnFamilies(FlushOptions(), FlushReason::kShutDown);
+    auto flush_options = FlushOptions();
+    flush_options.allow_write_stall = true;
+    s = DBImpl::FlushAllColumnFamilies(flush_options, FlushReason::kShutDown);
     s.PermitUncheckedError();  //**TODO: What to do on error?
   }