create index notify (#2003)

* create index notify
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* typo
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

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

core/src/db/DBImpl.cpp

@@ -1979,6 +1979,7 @@ DBImpl::BackgroundBuildIndex() {
         }
 
         LOG_ENGINE_DEBUG_ << "Background build index thread finished";
+        index_req_swn_.Notify();  // notify CreateIndex check circle
     }
 }
 
@@ -2162,7 +2163,7 @@ DBImpl::WaitCollectionIndexRecursively(const std::string& collection_id, const C
             status = meta_ptr_->UpdateCollectionFilesToIndex(collection_id);
         }
 
-        std::this_thread::sleep_for(std::chrono::seconds(WAIT_BUILD_INDEX_INTERVAL));
+        index_req_swn_.Wait_For(std::chrono::seconds(WAIT_BUILD_INDEX_INTERVAL));
         GetFilesToBuildIndex(collection_id, file_types, collection_files);
         ++times;
 

core/src/db/DBImpl.h

@@ -344,6 +344,7 @@ class DBImpl : public DB, public server::CacheConfigHandler, public server::Engi
     SimpleWaitNotify swn_index_;
 
     SimpleWaitNotify flush_req_swn_;
+    SimpleWaitNotify index_req_swn_;
 
     ThreadPool merge_thread_pool_;
     std::mutex merge_result_mutex_;