diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2956b867fbc3367a07a0cda110e94eb8856209c1..60ee5fcadc08c21cdb2f351f1deb62057b7d36f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - \#543 - client raise exception in shards when search results is empty
 - \#545 - Avoid dead circle of build index thread when error occurs
 - \#561 - Milvus server should report exception/error message or terminate on mysql metadata backend error
+- \#606 - No log generated during building index with CPU
 
 ## Feature
 - \#12 - Pure CPU version for Milvus
diff --git a/core/src/db/DBImpl.cpp b/core/src/db/DBImpl.cpp
index 0b3309d84e5a15d93b2b520546dcdbfc2f566f0f..eef6788d7e457bd56463857fa0cbc109dac621c8 100644
--- a/core/src/db/DBImpl.cpp
+++ b/core/src/db/DBImpl.cpp
@@ -836,13 +836,13 @@ DBImpl::BackgroundBuildIndex() {
 
     if (!to_index_files.empty()) {
         // step 2: put build index task to scheduler
-        std::map<scheduler::BuildIndexJobPtr, scheduler::TableFileSchemaPtr> job2file_map;
+        std::vector<std::pair<scheduler::BuildIndexJobPtr, scheduler::TableFileSchemaPtr>> job2file_map;
         for (auto& file : to_index_files) {
             scheduler::BuildIndexJobPtr job = std::make_shared<scheduler::BuildIndexJob>(meta_ptr_, options_);
             scheduler::TableFileSchemaPtr file_ptr = std::make_shared<meta::TableFileSchema>(file);
             job->AddToIndexFiles(file_ptr);
             scheduler::JobMgrInst::GetInstance()->Put(job);
-            job2file_map.insert(std::make_pair(job, file_ptr));
+            job2file_map.push_back(std::make_pair(job, file_ptr));
         }
 
         for (auto iter = job2file_map.begin(); iter != job2file_map.end(); ++iter) {