GJL commented on a change in pull request #11250: [FLINK-16302][rest]add log 
list and read log by name for taskmanager
URL: https://github.com/apache/flink/pull/11250#discussion_r391808587
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskExecutor.java
 ##########
 @@ -309,6 +311,25 @@ public TaskExecutor(
                return 
CompletableFuture.completedFuture(shuffleEnvironment.getPartitionsOccupyingLocalResources().isEmpty());
        }
 
+       @Override
+       public CompletableFuture<Collection<Tuple2<String, Long>>> 
requestLogList(Time timeout) {
+               final String logDir = 
taskManagerConfiguration.getTaskManagerLogDir();
+               if (logDir != null) {
+                       final File[] logFiles = new File(logDir).listFiles();
+
+                       if (logFiles == null) {
+                               return FutureUtils.completedExceptionally(
+                                       new FlinkException("The specific log 
directory is not a valid directory."));
+                       }
+
+                       final List<Tuple2<String, Long>> logsWithLength = 
Arrays.stream(logFiles)
+                               .map(logFile -> Tuple2.of(logFile.getName(), 
logFile.length()))
+                               .collect(Collectors.toList());
+                       return 
CompletableFuture.completedFuture(logsWithLength);
+               }
+               return FutureUtils.completedExceptionally(new 
FlinkException("There is no log file available on the TaskExecutor."));
 
 Review comment:
   Another reasonable behavior would be to return an empty collection. Not sure 
what is better here.

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