HDDS-140. Add DU usage to VolumeInfo.

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RoundRobinVolumeChoosingPolicy.java

@@ -28,7 +28,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * Choose volumes in round-robin order.
- * Use fine-grained locks to synchronize volume choosing.
+ * The caller should synchronize access to the list of volumes.
  */
 public class RoundRobinVolumeChoosingPolicy implements VolumeChoosingPolicy {
 

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/VolumeInfo.java

@@ -18,13 +18,14 @@
 
 package org.apache.hadoop.ozone.container.common.impl;
 
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.StorageType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.io.IOException;
-import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * Stores information about a disk/volume.
@@ -36,24 +37,29 @@ public class VolumeInfo {
   private final Path rootDir;
   private final StorageType storageType;
   private VolumeState state;
+
+  // Space usage calculator
+  private VolumeUsage usage;
   // Capacity configured. This is useful when we want to
   // limit the visible capacity for tests. If negative, then we just
   // query from the filesystem.
   private long configuredCapacity;
-  private volatile AtomicLong scmUsed = new AtomicLong(0);
 
   public static class Builder {
+    private final Configuration conf;
     private final Path rootDir;
     private StorageType storageType;
     private VolumeState state;
     private long configuredCapacity;
 
-    public Builder(Path rootDir) {
+    public Builder(Path rootDir, Configuration conf) {
       this.rootDir = rootDir;
+      this.conf = conf;
     }
 
-    public Builder(String rootDirStr) {
+    public Builder(String rootDirStr, Configuration conf) {
       this.rootDir = new Path(rootDirStr);
+      this.conf = conf;
     }
 
     public Builder storageType(StorageType storageType) {
@@ -76,9 +82,17 @@ public class VolumeInfo {
     }
   }
 
-  private VolumeInfo(Builder b) {
+  private VolumeInfo(Builder b) throws IOException {
 
     this.rootDir = b.rootDir;
+    File root = new File(rootDir.toString());
+
+    Boolean succeeded = root.isDirectory() || root.mkdirs();
+
+    if (!succeeded) {
+      LOG.error("Unable to create the volume root dir at : {}", root);
+      throw new IOException("Unable to create the volume root dir at " + root);
+    }
 
     this.storageType = (b.storageType != null ?
         b.storageType : StorageType.DEFAULT);
@@ -88,19 +102,42 @@ public class VolumeInfo {
 
     this.state = (b.state != null ? b.state : VolumeState.NOT_FORMATTED);
 
-    LOG.info("Creating Volume : " + rootDir + " of  storage type : " +
+    this.usage = new VolumeUsage(root, b.conf);
+
+    LOG.info("Creating Volume : " + rootDir + " of storage type : " +
         storageType + " and capacity : " + configuredCapacity);
   }
 
-  public void addSpaceUsed(long spaceUsed) {
-    this.scmUsed.getAndAdd(spaceUsed);
+  public long getCapacity() {
+    return configuredCapacity < 0 ? usage.getCapacity() : configuredCapacity;
   }
 
-  public long getAvailable() {
-    return configuredCapacity - scmUsed.get();
+  public long getAvailable() throws IOException {
+    return usage.getAvailable();
   }
 
-  public void setState(VolumeState state) {
+  public long getScmUsed() throws IOException {
+    return usage.getScmUsed();
+  }
+
+  void shutdown() {
+    this.state = VolumeState.NON_EXISTENT;
+    shutdownUsageThread();
+  }
+
+  void failVolume() {
+    setState(VolumeState.FAILED);
+    shutdownUsageThread();
+  }
+
+  private void shutdownUsageThread() {
+    if (usage != null) {
+      usage.shutdown();
+    }
+    usage = null;
+  }
+
+  void setState(VolumeState state) {
     this.state = state;
   }
 

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/VolumeSet.java

@@ -40,7 +40,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.EnumMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
@@ -55,32 +54,28 @@ public class VolumeSet {
   private static final Logger LOG = LoggerFactory.getLogger(VolumeSet.class);
 
   private Configuration conf;
+
   /**
-   * {@link VolumeSet#volumeList} maintains a list of active volumes in the
+   * {@link VolumeSet#volumeMap} maintains a map of all active volumes in the
    * DataNode. Each volume has one-to-one mapping with a volumeInfo object.
    */
-  private List<VolumeInfo> volumeList;
-  /**
-   * {@link VolumeSet#failedVolumeList} maintains a list of volumes which have
-   * failed. This list is mutually exclusive to {@link VolumeSet#volumeList}.
-   */
-  private List<VolumeInfo> failedVolumeList;
-  /**
-   * {@link VolumeSet#volumeMap} maintains a map of all volumes in the
-   * DataNode irrespective of their state.
-   */
   private Map<Path, VolumeInfo> volumeMap;
   /**
-   * {@link VolumeSet#volumeStateMap} maintains a list of volumes per
+   * {@link VolumeSet#failedVolumeMap} maintains a map of volumes which have
+   * failed. The keys in this map and {@link VolumeSet#volumeMap} are
+   * mutually exclusive.
+   */
+  private Map<Path, VolumeInfo> failedVolumeMap;
+  /**
+   * {@link VolumeSet#volumeStateMap} maintains a list of active volumes per
    * StorageType.
    */
   private EnumMap<StorageType, List<VolumeInfo>> volumeStateMap;
 
   /**
    * Lock to synchronize changes to the VolumeSet. Any update to
-   * {@link VolumeSet#volumeList}, {@link VolumeSet#failedVolumeList},
-   * {@link VolumeSet#volumeMap} or {@link VolumeSet#volumeStateMap} should
-   * be done after acquiring this lock.
+   * {@link VolumeSet#volumeMap}, {@link VolumeSet#failedVolumeMap}, or
+   * {@link VolumeSet#volumeStateMap} should be done after acquiring this lock.
    */
   private final AutoCloseableLock volumeSetLock;
 
@@ -100,9 +95,8 @@ public class VolumeSet {
 
   // Add DN volumes configured through ConfigKeys to volumeMap.
   private void initializeVolumeSet() throws DiskOutOfSpaceException {
-    volumeList = new ArrayList<>();
-    failedVolumeList = new ArrayList<>();
     volumeMap = new ConcurrentHashMap<>();
+    failedVolumeMap = new ConcurrentHashMap<>();
     volumeStateMap = new EnumMap<>(StorageType.class);
 
     Collection<String> datanodeDirs = conf.getTrimmedStringCollection(
@@ -123,7 +117,6 @@ public class VolumeSet {
       try {
         VolumeInfo volumeInfo = getVolumeInfo(dir);
 
-        volumeList.add(volumeInfo);
         volumeMap.put(volumeInfo.getRootDir(), volumeInfo);
         volumeStateMap.get(volumeInfo.getStorageType()).add(volumeInfo);
       } catch (IOException e) {
@@ -131,7 +124,7 @@ public class VolumeSet {
       }
     }
 
-    if (volumeList.size() == 0) {
+    if (volumeMap.size() == 0) {
       throw new DiskOutOfSpaceException("No storage location configured");
     }
   }
@@ -148,7 +141,7 @@ public class VolumeSet {
     StorageLocation location = StorageLocation.parse(rootDir);
     StorageType storageType = location.getStorageType();
 
-    VolumeInfo.Builder volumeBuilder = new VolumeInfo.Builder(rootDir);
+    VolumeInfo.Builder volumeBuilder = new VolumeInfo.Builder(rootDir, conf);
     volumeBuilder.storageType(storageType);
     return volumeBuilder.build();
   }
@@ -159,21 +152,17 @@ public class VolumeSet {
 
     try (AutoCloseableLock lock = volumeSetLock.acquire()) {
       if (volumeMap.containsKey(dirPath)) {
-        VolumeInfo volumeInfo = volumeMap.get(dirPath);
-        if (volumeInfo.isFailed()) {
-          volumeInfo.setState(VolumeState.NORMAL);
-          failedVolumeList.remove(volumeInfo);
-          volumeList.add(volumeInfo);
-        } else {
-          LOG.warn("Volume : " + volumeInfo.getRootDir() + " already " +
-              "exists in VolumeMap");
-        }
+        LOG.warn("Volume : {} already exists in VolumeMap", dataDir);
       } else {
-        VolumeInfo volumeInfo = getVolumeInfo(dataDir);
+        if (failedVolumeMap.containsKey(dirPath)) {
+          failedVolumeMap.remove(dirPath);
+        }
 
-        volumeList.add(volumeInfo);
-        volumeMap.put(volumeInfo.getRootDir(), volumeInfo);
+        VolumeInfo volumeInfo = getVolumeInfo(dirPath.toString());
+        volumeMap.put(dirPath, volumeInfo);
         volumeStateMap.get(volumeInfo.getStorageType()).add(volumeInfo);
+
+        LOG.debug("Added Volume : {} to VolumeSet", dataDir);
       }
     }
   }
@@ -185,13 +174,17 @@ public class VolumeSet {
     try (AutoCloseableLock lock = volumeSetLock.acquire()) {
       if (volumeMap.containsKey(dirPath)) {
         VolumeInfo volumeInfo = volumeMap.get(dirPath);
-        if (!volumeInfo.isFailed()) {
-          volumeInfo.setState(VolumeState.FAILED);
-          volumeList.remove(volumeInfo);
-          failedVolumeList.add(volumeInfo);
-        }
+        volumeInfo.failVolume();
+
+        volumeMap.remove(dirPath);
+        volumeStateMap.get(volumeInfo.getStorageType()).remove(volumeInfo);
+        failedVolumeMap.put(dirPath, volumeInfo);
+
+        LOG.debug("Moving Volume : {} to failed Volumes", dataDir);
+      } else if (failedVolumeMap.containsKey(dirPath)) {
+        LOG.debug("Volume : {} is not active", dataDir);
       } else {
-        LOG.warn("Volume : " + dataDir + " does not exist in VolumeMap");
+        LOG.warn("Volume : {} does not exist in VolumeSet", dataDir);
       }
     }
   }
@@ -203,39 +196,47 @@ public class VolumeSet {
     try (AutoCloseableLock lock = volumeSetLock.acquire()) {
       if (volumeMap.containsKey(dirPath)) {
         VolumeInfo volumeInfo = volumeMap.get(dirPath);
-        if (!volumeInfo.isFailed()) {
-          volumeList.remove(volumeInfo);
-        } else {
-          failedVolumeList.remove(volumeInfo);
-        }
+        volumeInfo.shutdown();
+
         volumeMap.remove(dirPath);
         volumeStateMap.get(volumeInfo.getStorageType()).remove(volumeInfo);
+
+        LOG.debug("Removed Volume : {} from VolumeSet", dataDir);
+      } else if (failedVolumeMap.containsKey(dirPath)) {
+        VolumeInfo volumeInfo = failedVolumeMap.get(dirPath);
+        volumeInfo.setState(VolumeState.NON_EXISTENT);
+
+        failedVolumeMap.remove(dirPath);
+        LOG.debug("Removed Volume : {} from failed VolumeSet", dataDir);
       } else {
-        LOG.warn("Volume: " + dataDir + " does not exist in " + "volumeMap.");
+        LOG.warn("Volume : {} does not exist in VolumeSet", dataDir);
       }
     }
   }
 
-  /**
-   * Return an iterator over {@link VolumeSet#volumeList}.
-   */
-  public Iterator<VolumeInfo> getIterator() {
-    return volumeList.iterator();
-  }
-
   public VolumeInfo chooseVolume(long containerSize,
       VolumeChoosingPolicy choosingPolicy) throws IOException {
-    return choosingPolicy.chooseVolume(volumeList, containerSize);
+    return choosingPolicy.chooseVolume(getVolumesList(), containerSize);
+  }
+
+  public void shutdown() {
+    for (VolumeInfo volumeInfo : volumeMap.values()) {
+      try {
+        volumeInfo.shutdown();
+      } catch (Exception e) {
+        LOG.error("Failed to shutdown volume : " + volumeInfo.getRootDir(), e);
+      }
+    }
   }
 
   @VisibleForTesting
   public List<VolumeInfo> getVolumesList() {
-    return ImmutableList.copyOf(volumeList);
+    return ImmutableList.copyOf(volumeMap.values());
   }
 
   @VisibleForTesting
   public List<VolumeInfo> getFailedVolumesList() {
-    return ImmutableList.copyOf(failedVolumeList);
+    return ImmutableList.copyOf(failedVolumeMap.values());
   }
 
   @VisibleForTesting

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/VolumeUsage.java

@@ -0,0 +1,189 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.hadoop.ozone.container.common.impl;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CachingGetSpaceUsed;
+import org.apache.hadoop.fs.DF;
+import org.apache.hadoop.fs.GetSpaceUsed;
+import org.apache.hadoop.io.IOUtils;
+import static org.apache.hadoop.util.RunJar.SHUTDOWN_HOOK_PRIORITY;
+import org.apache.hadoop.util.ShutdownHookManager;
+import org.apache.hadoop.util.Time;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.util.Scanner;
+
+/**
+ * Class that wraps the space df of the Datanode Volumes used by SCM
+ * containers.
+ */
+public class VolumeUsage {
+  private static final Logger LOG = LoggerFactory.getLogger(VolumeUsage.class);
+
+  private final File rootDir;
+  private final DF df;
+  private final File scmUsedFile;
+  private GetSpaceUsed scmUsage;
+  private Runnable shutdownHook;
+
+  private static final String DU_CACHE_FILE = "scmUsed";
+  private volatile boolean scmUsedSaved = false;
+
+  VolumeUsage(File dataLoc, Configuration conf)
+      throws IOException {
+    this.rootDir = dataLoc;
+
+    // SCM used cache file
+    scmUsedFile = new File(rootDir, DU_CACHE_FILE);
+    // get overall disk df
+    this.df = new DF(rootDir, conf);
+
+    startScmUsageThread(conf);
+  }
+
+  void startScmUsageThread(Configuration conf) throws IOException {
+    // get SCM specific df
+    this.scmUsage = new CachingGetSpaceUsed.Builder().setPath(rootDir)
+        .setConf(conf)
+        .setInitialUsed(loadScmUsed())
+        .build();
+
+    // Ensure scm df is saved during shutdown.
+    shutdownHook = () -> {
+      if (!scmUsedSaved) {
+        saveScmUsed();
+      }
+    };
+    ShutdownHookManager.get().addShutdownHook(shutdownHook,
+        SHUTDOWN_HOOK_PRIORITY);
+  }
+
+  long getCapacity() {
+    long capacity = df.getCapacity();
+    return (capacity > 0) ? capacity : 0;
+  }
+
+  /*
+   * Calculate the available space in the volume.
+   */
+  long getAvailable() throws IOException {
+    long remaining = getCapacity() - getScmUsed();
+    long available = df.getAvailable();
+    if (remaining > available) {
+      remaining = available;
+    }
+    return (remaining > 0) ? remaining : 0;
+  }
+
+  long getScmUsed() throws IOException{
+    return scmUsage.getUsed();
+  }
+
+  public void shutdown() {
+    saveScmUsed();
+    scmUsedSaved = true;
+
+    if (shutdownHook != null) {
+      ShutdownHookManager.get().removeShutdownHook(shutdownHook);
+    }
+
+    if (scmUsage instanceof CachingGetSpaceUsed) {
+      IOUtils.cleanupWithLogger(null, ((CachingGetSpaceUsed) scmUsage));
+    }
+  }
+
+  /**
+   * Read in the cached DU value and return it if it is less than 600 seconds
+   * old (DU update interval). Slight imprecision of scmUsed is not critical
+   * and skipping DU can significantly shorten the startup time.
+   * If the cached value is not available or too old, -1 is returned.
+   */
+  long loadScmUsed() {
+    long cachedScmUsed;
+    long mtime;
+    Scanner sc;
+
+    try {
+      sc = new Scanner(scmUsedFile, "UTF-8");
+    } catch (FileNotFoundException fnfe) {
+      return -1;
+    }
+
+    try {
+      // Get the recorded scmUsed from the file.
+      if (sc.hasNextLong()) {
+        cachedScmUsed = sc.nextLong();
+      } else {
+        return -1;
+      }
+      // Get the recorded mtime from the file.
+      if (sc.hasNextLong()) {
+        mtime = sc.nextLong();
+      } else {
+        return -1;
+      }
+
+      // Return the cached value if mtime is okay.
+      if (mtime > 0 && (Time.now() - mtime < 600000L)) {
+        LOG.info("Cached ScmUsed found for {} : {} ", rootDir,
+            cachedScmUsed);
+        return cachedScmUsed;
+      }
+      return -1;
+    } finally {
+      sc.close();
+    }
+  }
+
+  /**
+   * Write the current scmUsed to the cache file.
+   */
+  void saveScmUsed() {
+    if (scmUsedFile.exists() && !scmUsedFile.delete()) {
+      LOG.warn("Failed to delete old scmUsed file in {}.", rootDir);
+    }
+    OutputStreamWriter out = null;
+    try {
+      long used = getScmUsed();
+      if (used > 0) {
+        out = new OutputStreamWriter(new FileOutputStream(scmUsedFile),
+            StandardCharsets.UTF_8);
+        // mtime is written last, so that truncated writes won't be valid.
+        out.write(Long.toString(used) + " " + Long.toString(Time.now()));
+        out.flush();
+        out.close();
+        out = null;
+      }
+    } catch (IOException ioe) {
+      // If write failed, the volume might be bad. Since the cache file is
+      // not critical, log the error and continue.
+      LOG.warn("Failed to write scmUsed to " + scmUsedFile, ioe);
+    } finally {
+      IOUtils.cleanupWithLogger(null, out);
+    }
+  }
+}

hadoop-hdds/container-service/src/test/java/org/apache/hadoop/ozone/container/common/interfaces/TestVolumeSet.java

@@ -27,6 +27,7 @@ import org.apache.hadoop.ozone.container.common.impl.VolumeInfo;
 import org.apache.hadoop.ozone.container.common.impl.VolumeSet;
 import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import org.junit.Before;
 import org.junit.Rule;
@@ -73,8 +74,10 @@ public class TestVolumeSet {
     // VolumeSet initialization should add volume1 and volume2 to VolumeSet
     assertEquals("VolumeSet intialization is incorrect",
         volumesList.size(), volumes.size());
-    assertEquals(volume1, volumesList.get(0).getRootDir().toString());
-    assertEquals(volume2, volumesList.get(1).getRootDir().toString());
+    assertTrue("VolumeSet not initailized correctly",
+        checkVolumeExistsInVolumeSet(volume1));
+    assertTrue("VolumeSet not initailized correctly",
+        checkVolumeExistsInVolumeSet(volume2));
   }
 
   @Test
@@ -88,9 +91,8 @@ public class TestVolumeSet {
     volumeSet.addVolume(volume3);
 
     assertEquals(3, volumeSet.getVolumesList().size());
-    assertEquals("AddVolume did not add requested volume to VolumeSet",
-        volume3,
-        volumeSet.getVolumesList().get(2).getRootDir().toString());
+    assertTrue("AddVolume did not add requested volume to VolumeSet",
+        checkVolumeExistsInVolumeSet(volume3));
   }
 
   @Test
@@ -103,15 +105,15 @@ public class TestVolumeSet {
     assertEquals(1, volumeSet.getVolumesList().size());
 
     // Failed volume should be added to FailedVolumeList
-    assertEquals("Failed volume not present in FailedVolumeList",
+    assertEquals("Failed volume not present in FailedVolumeMap",
         1, volumeSet.getFailedVolumesList().size());
     assertEquals("Failed Volume list did not match", volume1,
         volumeSet.getFailedVolumesList().get(0).getRootDir().toString());
+    assertTrue(volumeSet.getFailedVolumesList().get(0).isFailed());
 
-    // Failed volume should exist in VolumeMap with isFailed flag set to true
+    // Failed volume should not exist in VolumeMap
     Path volume1Path = new Path(volume1);
-    assertTrue(volumeSet.getVolumeMap().containsKey(volume1Path));
-    assertTrue(volumeSet.getVolumeMap().get(volume1Path).isFailed());
+    assertFalse(volumeSet.getVolumeMap().containsKey(volume1Path));
   }
 
   @Test
@@ -130,9 +132,18 @@ public class TestVolumeSet {
         LogFactory.getLog(VolumeSet.class));
     volumeSet.removeVolume(volume1);
     assertEquals(1, volumeSet.getVolumesList().size());
-    String expectedLogMessage = "Volume: " + volume1 + " does not exist in "
-        + "volumeMap.";
+    String expectedLogMessage = "Volume : " + volume1 + " does not exist in "
+        + "VolumeSet";
     assertTrue("Log output does not contain expected log message: "
         + expectedLogMessage, logs.getOutput().contains(expectedLogMessage));
   }
+
+  private boolean checkVolumeExistsInVolumeSet(String volume) {
+    for (VolumeInfo volumeInfo : volumeSet.getVolumesList()) {
+      if (volumeInfo.getRootDir().toString().equals(volume)) {
+        return true;
+      }
+    }
+    return false;
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/VolumeChoosingPolicy.java

@@ -32,7 +32,7 @@ public interface VolumeChoosingPolicy<V extends FsVolumeSpi> {
    * Choose a volume to place a replica,
    * given a list of volumes and the replica size sought for storage.
    * 
-   * The implementations of this interface must be thread-safe.
+   * The caller should synchronize access to the list of volumes.
    * 
    * @param volumes - a list of available volumes.
    * @param replicaSize - the size of the replica for which a volume is sought.