check task table limit (#1902)

Signed-off-by: Ngroot <yihua.mo@zilliz.com>

core/src/db/DBImpl.cpp

@@ -36,6 +36,7 @@
 #include "meta/MetaFactory.h"
 #include "meta/SqliteMetaImpl.h"
 #include "metrics/Metrics.h"
+#include "scheduler/Definition.h"
 #include "scheduler/SchedInst.h"
 #include "scheduler/job/BuildIndexJob.h"
 #include "scheduler/job/DeleteJob.h"
@@ -1214,6 +1215,13 @@ DBImpl::QueryAsync(const std::shared_ptr<server::Context>& context, const meta::
     milvus::server::ContextChild tracer(context, "Query Async");
     server::CollectQueryMetrics metrics(vectors.vector_count_);
 
+    if (files.size() > milvus::scheduler::TASK_TABLE_MAX_COUNT) {
+        std::string msg =
+            "Search files count exceed scheduler limit: " + std::to_string(milvus::scheduler::TASK_TABLE_MAX_COUNT);
+        ENGINE_LOG_ERROR << msg;
+        return Status(DB_ERROR, msg);
+    }
+
     TimeRecorder rc("");
 
     // step 1: construct search job

core/src/scheduler/Definition.h

@@ -8,6 +8,7 @@
 // Unless required by applicable law or agreed to in writing, software distributed under the License
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License.
+#pragma once
 
 #include <condition_variable>
 #include <deque>
@@ -35,5 +36,7 @@ using EngineFactory = engine::EngineFactory;
 using EngineType = engine::EngineType;
 using MetricType = engine::MetricType;
 
+constexpr uint64_t TASK_TABLE_MAX_COUNT = 1ULL << 16ULL;
+
 }  // namespace scheduler
 }  // namespace milvus

core/src/scheduler/TaskTable.h

@@ -97,7 +97,7 @@ struct TaskTableItem : public interface::dumpable {
 
 class TaskTable : public interface::dumpable {
  public:
-    TaskTable() : table_(1ULL << 16ULL) {
+    TaskTable() : table_(TASK_TABLE_MAX_COUNT) {
     }
 
     TaskTable(const TaskTable&) = delete;