DPL: Explicitly printout the last file opened

Framework/AnalysisSupport/src/DataInputDirector.cxx

@@ -146,6 +146,7 @@ bool DataInputDescriptor::setFile(int counter)
     throw std::runtime_error(fmt::format("Couldn't open file \"{}\"!", filename));
   }
   rootFS = std::dynamic_pointer_cast<TFileFileSystem>(mCurrentFilesystem);
+  printFileOpening();
 
   // get the parent file map if exists
   mParentFileMap = (TMap*)rootFS->GetFile()->Get("parentFiles"); // folder name (DF_XXX) --> parent file (absolute path)
@@ -297,6 +298,21 @@ int DataInputDescriptor::getReadTimeFramesInFile(int counter)
   return std::count(list.begin(), list.end(), true);
 }
 
+void DataInputDescriptor::printFileOpening()
+{
+  auto rootFS = std::dynamic_pointer_cast<TFileFileSystem>(mCurrentFilesystem);
+  auto f = dynamic_cast<TFile*>(rootFS->GetFile());
+  std::string monitoringInfo(fmt::format("lfn={},size={}", f->GetName(), f->GetSize()));
+#if __has_include(<TJAlienFile.h>)
+  auto alienFile = dynamic_cast<TJAlienFile*>(f);
+  if (alienFile) {
+    monitoringInfo += fmt::format(",se={},open_time={:.1f}", alienFile->GetSE(), alienFile->GetElapsed());
+  }
+#endif
+  mMonitoring->send(o2::monitoring::Metric{monitoringInfo, "aod-file-open-info"}.addTag(o2::monitoring::tags::Key::Subsystem, o2::monitoring::tags::Value::DPL));
+  LOGP(info, "Opening file: {}", monitoringInfo);
+}
+
 void DataInputDescriptor::printFileStatistics()
 {
   int64_t wait_time = (int64_t)uv_hrtime() - (int64_t)mCurrentFileStartedAt - (int64_t)mIOTime;

Framework/AnalysisSupport/src/DataInputDirector.h

@@ -82,6 +82,7 @@ class DataInputDescriptor
 
   bool readTree(DataAllocator& outputs, header::DataHeader dh, int counter, int numTF, std::string treename, size_t& totalSizeCompressed, size_t& totalSizeUncompressed);
 
+  void printFileOpening();
   void printFileStatistics();
   void closeInputFile();
   bool isAlienSupportOn() { return mAlienSupport; }

Framework/AnalysisSupport/src/Plugin.cxx

@@ -76,6 +76,24 @@ struct RunSummary : o2::framework::ServicePlugin {
               LOGP(info, "{}", files[fi % files.size()].data);
             }
           }
+          for (size_t li = 0; li < metrics.metricLabels.size(); ++li) {
+            MetricLabel const&label = metrics.metricLabels[li];
+            if (strcmp(label.label, "aod-file-open-info") != 0) {
+              continue;
+            }
+            MetricInfo const&metric = metrics.metrics[li];
+            auto &files = metrics.stringMetrics[metric.storeIdx];
+            if (metric.filledMetrics) {
+              LOGP(info, "### Files opened stats ###");
+            }
+            std::string lastFileRead;
+            for (size_t fi = 0; fi < metric.filledMetrics; ++fi) {
+              lastFileRead = files[fi % files.size()].data;
+            }
+            if (lastFileRead.empty() == false) {
+              LOGP(info, "Last file opened: {}", lastFileRead);
+            }
+          }
         } },
       .kind = ServiceKind::Serial};
   }