[GitHub] morningman commented on a change in pull request #349: Improve the Backend's disk info report performance

[GitBox <gi...@apache.org>]

morningman commented on a change in pull request #349: Improve the Backend's disk info report performance
URL: https://github.com/apache/incubator-doris/pull/349#discussion_r236072019
 
 

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 File path: be/src/olap/olap_engine.cpp
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 @@ -529,20 +529,60 @@ OLAPStatus OLAPEngine::get_all_root_path_info(vector<RootPathInfo>* root_paths_i
     OLAPStatus res = OLAP_SUCCESS;
     root_paths_info->clear();
 
-    std::lock_guard<std::mutex> l(_store_lock);
-    for (auto& it : _store_map) {
-        root_paths_info->emplace_back(it.second->to_root_path_info());
+    MonotonicStopWatch timer;
+    timer.start();
+    int tablet_counter = 0;
+
+    // get all root path info and construct a path map.
+    // path -> RootPathInfo
+    std::map<std::string, RootPathInfo> path_map;
+    {
+        std::lock_guard<std::mutex> l(_store_lock);
+        for (auto& it : _store_map) {
+            std::string path = it.first;
+            path_map.emplace(path, it.second->to_root_path_info());
+            // if this path is not used, init it's info
+            if (!path_map[path].is_used) {
+                path_map[path].capacity = 1;
 
 Review comment:
   Capacity is set in Store.cpp. And I think the capacity will not change. If it changes, the Backend process must be restarted and the capacity is set when store is being initialized.

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