YARN-5027. NM should clean up app log dirs after NM restart. Contributed by sandflee

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/ResourceLocalizationService.java

@@ -242,6 +242,7 @@ public class ResourceLocalizationService extends CompositeService
 
       if (!stateStore.canRecover()|| stateStore.isNewlyCreated()) {
         cleanUpLocalDirs(lfs, delService);
+        cleanupLogDirs(lfs, delService);
         initializeLocalDirs(lfs);
         initializeLogDirs(lfs);
       }
@@ -1374,9 +1375,9 @@ public class ResourceLocalizationService extends CompositeService
     }
   }
 
-  private void initializeLogDir(FileContext lfs, String logDir) {
+  private void initializeLogDir(FileContext fs, String logDir) {
     try {
-      lfs.mkdir(new Path(logDir), null, true);
+      fs.mkdir(new Path(logDir), null, true);
     } catch (FileAlreadyExistsException fe) {
       // do nothing
     } catch (IOException e) {
@@ -1386,6 +1387,57 @@ public class ResourceLocalizationService extends CompositeService
     }
   }
 
+  private void cleanupLogDirs(FileContext fs, DeletionService del) {
+    for (String logDir : dirsHandler.getLogDirsForCleanup()) {
+      try {
+        cleanupLogDir(fs, del, logDir);
+      } catch (IOException e) {
+        LOG.warn("failed to cleanup app log dir " + logDir, e);
+      }
+    }
+  }
+
+  private void cleanupLogDir(FileContext fs, DeletionService del,
+      String logDir) throws IOException {
+    if (!fs.util().exists(new Path(logDir))){
+      return;
+    }
+    renameAppLogDir(logDir);
+    deleteAppLogDir(fs, del, logDir);
+  }
+
+  private void renameAppLogDir(String logDir) throws IOException {
+    long currentTimeStamp = System.currentTimeMillis();
+    RemoteIterator<FileStatus> fileStatuses =
+        lfs.listStatus(new Path(logDir));
+    if (fileStatuses != null) {
+      while (fileStatuses.hasNext()) {
+        FileStatus fileStatus = fileStatuses.next();
+        String appName = fileStatus.getPath().getName();
+        if (appName.matches("^application_\\d+_\\d+$")) {
+          lfs.rename(new Path(logDir, appName),
+              new Path(logDir, appName + "_DEL_" + currentTimeStamp));
+        }
+      }
+    }
+  }
+
+  private void deleteAppLogDir(FileContext fs, DeletionService del,
+      String logDir) throws IOException {
+    RemoteIterator<FileStatus> fileStatuses =
+        fs.listStatus(new Path(logDir));
+    if (fileStatuses != null) {
+      while (fileStatuses.hasNext()) {
+        FileStatus fileStatus = fileStatuses.next();
+        String appName = fileStatus.getPath().getName();
+        if (appName.matches("^application_\\d+_\\d+_DEL_\\d+$")) {
+          LOG.info("delete app log dir," + appName);
+          del.delete(null, fileStatus.getPath());
+        }
+      }
+    }
+  }
+
   private void cleanUpLocalDirs(FileContext lfs, DeletionService del) {
     for (String localDir : dirsHandler.getLocalDirsForCleanup()) {
       cleanUpLocalDir(lfs, del, localDir);