YARN-3727. For better error recovery, check if the directory exists before using it for localization. Contributed by Zhihai Xu

hadoop-yarn-project/CHANGES.txt

@@ -1005,6 +1005,9 @@ Release 2.7.2 - UNRELEASED
     YARN-4180. AMLauncher does not retry on failures when talking to NM.
     (adhoot)
 
+    YARN-3727. For better error recovery, check if the directory exists before
+    using it for localization. (Zhihai Xu via jlowe)
+
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES

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

@@ -33,7 +33,8 @@ interface LocalResourcesTracker
 
   boolean remove(LocalizedResource req, DeletionService delService);
 
-  Path getPathForLocalization(LocalResourceRequest req, Path localDirPath);
+  Path getPathForLocalization(LocalResourceRequest req, Path localDirPath,
+      DeletionService delService);
 
   String getUser();
 

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

@@ -440,10 +440,12 @@ class LocalResourcesTrackerImpl implements LocalResourcesTracker {
    * @param {@link LocalResourceRequest} Resource localization request to
    *        localize the resource.
    * @param {@link Path} local directory path
+   * @param {@link DeletionService} Deletion Service to delete existing
+   *        path for localization.
    */
   @Override
-  public Path
+  public Path getPathForLocalization(LocalResourceRequest req,
-      getPathForLocalization(LocalResourceRequest req, Path localDirPath) {
+      Path localDirPath, DeletionService delService) {
     Path rPath = localDirPath;
     if (useLocalCacheDirectoryManager && localDirPath != null) {
 
@@ -463,8 +465,22 @@ class LocalResourcesTrackerImpl implements LocalResourcesTracker {
       inProgressLocalResourcesMap.put(req, rPath);
     }
 
-    rPath = new Path(rPath,
+    while (true) {
+      Path uniquePath = new Path(rPath,
           Long.toString(uniqueNumberGenerator.incrementAndGet()));
+      File file = new File(uniquePath.toUri().getRawPath());
+      if (!file.exists()) {
+        rPath = uniquePath;
+        break;
+      }
+      // If the directory already exists, delete it and move to next one.
+      LOG.warn("Directory " + uniquePath + " already exists, " +
+          "try next one.");
+      if (delService != null) {
+        delService.delete(getUser(), uniquePath);
+      }
+    }
+
     Path localPath = new Path(rPath, req.getPath().getName());
     LocalizedResource rsrc = localrsrc.get(req);
     rsrc.setLocalPath(localPath);

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

@@ -830,7 +830,8 @@ public class ResourceLocalizationService extends CompositeService
                     + ContainerLocalizer.FILECACHE,
                   ContainerLocalizer.getEstimatedSize(resource), true);
             Path publicDirDestPath =
-                publicRsrc.getPathForLocalization(key, publicRootPath);
+                publicRsrc.getPathForLocalization(key, publicRootPath,
+                    delService);
             if (!publicDirDestPath.getParent().equals(publicRootPath)) {
               DiskChecker.checkDir(new File(publicDirDestPath.toUri().getPath()));
             }
@@ -1116,7 +1117,7 @@ public class ResourceLocalizationService extends CompositeService
           dirsHandler.getLocalPathForWrite(cacheDirectory,
             ContainerLocalizer.getEstimatedSize(rsrc), false);
       return tracker.getPathForLocalization(new LocalResourceRequest(rsrc),
-          dirPath);
+          dirPath, delService);
     }
 
     @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/TestLocalResourcesTrackerImpl.java

@@ -35,6 +35,7 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ContainerId;
@@ -427,7 +428,7 @@ public class TestLocalResourcesTrackerImpl {
       // Simulate the process of localization of lr1
       // NOTE: Localization path from tracker has resource ID at end
       Path hierarchicalPath1 =
-          tracker.getPathForLocalization(lr1, localDir).getParent();
+          tracker.getPathForLocalization(lr1, localDir, null).getParent();
       // Simulate lr1 getting localized
       ResourceLocalizedEvent rle1 =
           new ResourceLocalizedEvent(lr1,
@@ -444,7 +445,7 @@ public class TestLocalResourcesTrackerImpl {
       tracker.handle(reqEvent2);
 
       Path hierarchicalPath2 =
-          tracker.getPathForLocalization(lr2, localDir).getParent();
+          tracker.getPathForLocalization(lr2, localDir, null).getParent();
       // localization failed.
       ResourceFailedLocalizationEvent rfe2 =
           new ResourceFailedLocalizationEvent(
@@ -463,7 +464,7 @@ public class TestLocalResourcesTrackerImpl {
           LocalResourceVisibility.PUBLIC, lc1);
       tracker.handle(reqEvent3);
       Path hierarchicalPath3 =
-          tracker.getPathForLocalization(lr3, localDir).getParent();
+          tracker.getPathForLocalization(lr3, localDir, null).getParent();
       // localization successful
       ResourceLocalizedEvent rle3 =
           new ResourceLocalizedEvent(lr3, new Path(hierarchicalPath3.toUri()
@@ -542,7 +543,8 @@ public class TestLocalResourcesTrackerImpl {
       dispatcher.await();
 
       // Simulate the process of localization of lr1
-      Path hierarchicalPath1 = tracker.getPathForLocalization(lr1, localDir);
+      Path hierarchicalPath1 = tracker.getPathForLocalization(lr1, localDir,
+          null);
 
       ArgumentCaptor<LocalResourceProto> localResourceCaptor =
           ArgumentCaptor.forClass(LocalResourceProto.class);
@@ -622,7 +624,8 @@ public class TestLocalResourcesTrackerImpl {
       dispatcher.await();
 
       // Simulate the process of localization of lr1
-      Path hierarchicalPath1 = tracker.getPathForLocalization(lr1, localDir);
+      Path hierarchicalPath1 = tracker.getPathForLocalization(lr1, localDir,
+          null);
 
       ArgumentCaptor<LocalResourceProto> localResourceCaptor =
           ArgumentCaptor.forClass(LocalResourceProto.class);
@@ -691,7 +694,8 @@ public class TestLocalResourcesTrackerImpl {
           LocalResourceVisibility.APPLICATION, lc2);
       tracker.handle(reqEvent2);
       dispatcher.await();
-      Path hierarchicalPath2 = tracker.getPathForLocalization(lr2, localDir);
+      Path hierarchicalPath2 = tracker.getPathForLocalization(lr2, localDir,
+          null);
       long localizedId2 = Long.parseLong(hierarchicalPath2.getName());
       Assert.assertEquals(localizedId1 + 1, localizedId2);
     } finally {
@@ -785,6 +789,49 @@ public class TestLocalResourcesTrackerImpl {
     }
   }
 
+  @Test
+  @SuppressWarnings("unchecked")
+  public void testGetPathForLocalization() throws Exception {
+    FileContext lfs = FileContext.getLocalFSFileContext();
+    Path base_path = new Path("target",
+        TestLocalResourcesTrackerImpl.class.getSimpleName());
+    final String user = "someuser";
+    final ApplicationId appId = ApplicationId.newInstance(1, 1);
+    Configuration conf = new YarnConfiguration();
+    DrainDispatcher dispatcher = null;
+    dispatcher = createDispatcher(conf);
+    EventHandler<LocalizerEvent> localizerEventHandler =
+        mock(EventHandler.class);
+    EventHandler<LocalizerEvent> containerEventHandler =
+        mock(EventHandler.class);
+    dispatcher.register(LocalizerEventType.class, localizerEventHandler);
+    dispatcher.register(ContainerEventType.class, containerEventHandler);
+    NMStateStoreService stateStore = mock(NMStateStoreService.class);
+    DeletionService delService = mock(DeletionService.class);
+    try {
+      LocalResourceRequest req1 = createLocalResourceRequest(user, 1, 1,
+          LocalResourceVisibility.PUBLIC);
+      LocalizedResource lr1 = createLocalizedResource(req1, dispatcher);
+      ConcurrentMap<LocalResourceRequest, LocalizedResource> localrsrc =
+          new ConcurrentHashMap<LocalResourceRequest, LocalizedResource>();
+      localrsrc.put(req1, lr1);
+      LocalResourcesTrackerImpl tracker = new LocalResourcesTrackerImpl(user,
+          appId, dispatcher, localrsrc, true, conf, stateStore, null);
+      Path conflictPath = new Path(base_path, "10");
+      Path qualifiedConflictPath = lfs.makeQualified(conflictPath);
+      lfs.mkdir(qualifiedConflictPath, null, true);
+      Path rPath = tracker.getPathForLocalization(req1, base_path,
+          delService);
+      Assert.assertFalse(lfs.util().exists(rPath));
+      verify(delService, times(1)).delete(eq(user), eq(conflictPath));
+    } finally {
+      lfs.delete(base_path, true);
+      if (dispatcher != null) {
+        dispatcher.stop();
+      }
+    }
+  }
+
   @SuppressWarnings("unchecked")
   @Test
   public void testResourcePresentInGoodDir() throws IOException {
@@ -832,8 +879,10 @@ public class TestLocalResourcesTrackerImpl {
       tracker.handle(req21Event);
       dispatcher.await();
       // Localize resource1
-      Path p1 = tracker.getPathForLocalization(req1, new Path("/tmp/somedir1"));
+      Path p1 = tracker.getPathForLocalization(req1,
-      Path p2 = tracker.getPathForLocalization(req2, new Path("/tmp/somedir2"));
+          new Path("/tmp/somedir1"), null);
+      Path p2 = tracker.getPathForLocalization(req2,
+          new Path("/tmp/somedir2"), null);
       ResourceLocalizedEvent rle1 = new ResourceLocalizedEvent(req1, p1, 1);
       tracker.handle(rle1);
       ResourceLocalizedEvent rle2 = new ResourceLocalizedEvent(req2, p2, 1);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/TestResourceLocalizationService.java

@@ -624,29 +624,31 @@ public class TestResourceLocalizationService {
       // Simulate start of localization for all resources
       privTracker1.getPathForLocalization(privReq1,
           dirsHandler.getLocalPathForWrite(
-              ContainerLocalizer.USERCACHE + user1));
+              ContainerLocalizer.USERCACHE + user1), null);
       privTracker1.getPathForLocalization(privReq2,
           dirsHandler.getLocalPathForWrite(
-              ContainerLocalizer.USERCACHE + user1));
+              ContainerLocalizer.USERCACHE + user1), null);
       LocalizedResource privLr1 = privTracker1.getLocalizedResource(privReq1);
       LocalizedResource privLr2 = privTracker1.getLocalizedResource(privReq2);
       appTracker1.getPathForLocalization(appReq1,
           dirsHandler.getLocalPathForWrite(
-              ContainerLocalizer.APPCACHE + appId1));
+              ContainerLocalizer.APPCACHE + appId1), null);
       LocalizedResource appLr1 = appTracker1.getLocalizedResource(appReq1);
       appTracker2.getPathForLocalization(appReq2,
           dirsHandler.getLocalPathForWrite(
-              ContainerLocalizer.APPCACHE + appId2));
+              ContainerLocalizer.APPCACHE + appId2), null);
       LocalizedResource appLr2 = appTracker2.getLocalizedResource(appReq2);
       appTracker2.getPathForLocalization(appReq3,
           dirsHandler.getLocalPathForWrite(
-              ContainerLocalizer.APPCACHE + appId2));
+              ContainerLocalizer.APPCACHE + appId2), null);
       LocalizedResource appLr3 = appTracker2.getLocalizedResource(appReq3);
       pubTracker.getPathForLocalization(pubReq1,
-          dirsHandler.getLocalPathForWrite(ContainerLocalizer.FILECACHE));
+          dirsHandler.getLocalPathForWrite(ContainerLocalizer.FILECACHE),
+          null);
       LocalizedResource pubLr1 = pubTracker.getLocalizedResource(pubReq1);
       pubTracker.getPathForLocalization(pubReq2,
-          dirsHandler.getLocalPathForWrite(ContainerLocalizer.FILECACHE));
+          dirsHandler.getLocalPathForWrite(ContainerLocalizer.FILECACHE),
+          null);
       LocalizedResource pubLr2 = pubTracker.getLocalizedResource(pubReq2);
 
       // Simulate completion of localization for most resources with