[GitHub] [incubator-uniffle] jerqi commented on a diff in pull request #168: [Improvement] Should match from pathToStorages when appId does not exist in appIdToStorages

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

jerqi commented on code in PR #168:
URL: https://github.com/apache/incubator-uniffle/pull/168#discussion_r950950588


##########
server/src/main/java/org/apache/uniffle/server/storage/HdfsStorageManager.java:
##########
@@ -108,13 +114,25 @@ public void registerRemoteStorage(String appId, RemoteStorageInfo remoteStorageI
     appIdToStorages.putIfAbsent(appId, pathToStorages.get(remoteStorage));
   }
 
-  private HdfsStorage getStorageByAppId(String appId) {
+  public HdfsStorage getStorageByAppId(String appId) {
     if (!appIdToStorages.containsKey(appId)) {
-      String msg = "Can't find HDFS storage for appId[" + appId + "]";
-      LOG.error(msg);
-      // outside should deal with null situation
-      // todo: it's better to have a fake storage for null situation
-      return null;
+      synchronized (this) {
+        FileSystem fs;
+        try {
+          List<Path> appStoragePath = pathToStorages.keySet().stream().map(
+              basePath -> new Path(basePath + Constants.KEY_SPLIT_CHAR + appId)).collect(Collectors.toList());
+          for (Path path : appStoragePath) {
+            fs = HadoopFilesystemProvider.getFilesystem(path, hadoopConf);
+            if (fs.isDirectory(path)) {
+              return new HdfsStorage(path.getParent().toString(), hadoopConf);
+            }
+          }
+        } catch (Exception e) {
+          LOG.error("Some error happened when fileSystem got the file status.");
+          e.printStackTrace();

Review Comment:
   Why do we use `printStackTrace`,  it print the error stack in the stdout, could we print the error stack in the log?



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