HDDS-1708. Add container scrubber metrics.

Contributed by Hrishikesh Gadre.

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/impl/ChunkManagerFactory.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.ozone.container.keyvalue.impl;
 
 import com.google.common.base.Preconditions;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdds.HddsConfigKeys;
 import org.apache.hadoop.ozone.container.keyvalue.interfaces.ChunkManager;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/ContainerDataScanner.java

@@ -19,7 +19,10 @@ package org.apache.hadoop.ozone.container.ozoneimpl;
 
 import java.io.IOException;
 import java.util.Iterator;
+import java.util.concurrent.TimeUnit;
 
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.util.Canceler;
 import org.apache.hadoop.hdfs.util.DataTransferThrottler;
 import org.apache.hadoop.ozone.container.common.interfaces.Container;
@@ -42,6 +45,7 @@ public class ContainerDataScanner extends Thread {
   private final ContainerController controller;
   private final DataTransferThrottler throttler;
   private final Canceler canceler;
+  private final ContainerDataScrubberMetrics metrics;
 
   /**
    * True if the thread is stopping.<p/>
@@ -50,12 +54,15 @@ public class ContainerDataScanner extends Thread {
   private volatile boolean stopping = false;
 
 
-  public ContainerDataScanner(ContainerController controller,
+  public ContainerDataScanner(Configuration conf,
+                              ContainerController controller,
                               HddsVolume volume, long bytesPerSec) {
     this.controller = controller;
     this.volume = volume;
-    this.throttler = new DataTransferThrottler(bytesPerSec);
+    this.throttler = new HddsDataTransferThrottler(bytesPerSec);
     this.canceler = new Canceler();
+    this.metrics = ContainerDataScrubberMetrics.create(conf,
+        volume.toString());
     setName("ContainerDataScanner(" + volume + ")");
     setDaemon(true);
   }
@@ -65,26 +72,54 @@ public class ContainerDataScanner extends Thread {
     LOG.trace("{}: thread starting.", this);
     try {
       while (!stopping) {
+        runIteration();
+        metrics.resetNumContainersScanned();
+        metrics.resetNumUnhealthyContainers();
+      }
+      LOG.info("{} exiting.", this);
+    } catch (Throwable e) {
+      LOG.error("{} exiting because of exception ", this, e);
+    } finally {
+      if (metrics != null) {
+        metrics.unregister();
+      }
+    }
+  }
+
+  @VisibleForTesting
+  public void runIteration() {
+    long startTime = System.nanoTime();
     Iterator<Container> itr = controller.getContainers(volume);
     while (!stopping && itr.hasNext()) {
       Container c = itr.next();
-          try {
       if (c.shouldScanData()) {
-              if(!c.scanData(throttler, canceler)) {
+        try {
+          if (!c.scanData(throttler, canceler)) {
+            metrics.incNumUnHealthyContainers();
             controller.markContainerUnhealthy(
                 c.getContainerData().getContainerID());
           }
-            }
         } catch (IOException ex) {
           long containerId = c.getContainerData().getContainerID();
           LOG.warn("Unexpected exception while scanning container "
               + containerId, ex);
+        } finally {
+          metrics.incNumContainersScanned();
         }
       }
     }
-      LOG.info("{} exiting.", this);
-    } catch (Throwable e) {
-      LOG.error("{} exiting because of exception ", this, e);
+    long totalDuration = System.nanoTime() - startTime;
+    if (!stopping) {
+      metrics.incNumScanIterations();
+      LOG.info("Completed an iteration of container data scrubber in" +
+              " {} minutes." +
+              " Number of  iterations (since the data-node restart) : {}" +
+              ", Number of containers scanned in this iteration : {}" +
+              ", Number of unhealthy containers found in this iteration : {}",
+          TimeUnit.NANOSECONDS.toMinutes(totalDuration),
+          metrics.getNumScanIterations(),
+          metrics.getNumContainersScanned(),
+          metrics.getNumUnHealthyContainers());
     }
   }
 
@@ -100,9 +135,32 @@ public class ContainerDataScanner extends Thread {
     }
   }
 
+  @VisibleForTesting
+  public ContainerDataScrubberMetrics getMetrics() {
+    return metrics;
+  }
+
   @Override
   public String toString() {
     return "ContainerDataScanner(" + volume +
         ", " + volume.getStorageID() + ")";
   }
+
+  private class HddsDataTransferThrottler extends DataTransferThrottler {
+    HddsDataTransferThrottler(long bandwidthPerSec) {
+      super(bandwidthPerSec);
+    }
+
+    @Override
+    public synchronized void throttle(long numOfBytes) {
+      ContainerDataScanner.this.metrics.incNumBytesScanned(numOfBytes);
+      super.throttle(numOfBytes);
+    }
+
+    @Override
+    public synchronized void throttle(long numOfBytes, Canceler c) {
+      ContainerDataScanner.this.metrics.incNumBytesScanned(numOfBytes);
+      super.throttle(numOfBytes, c);
+    }
+  }
 }

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/ContainerDataScrubberMetrics.java

@@ -0,0 +1,115 @@
+/**
+ * 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.ozoneimpl;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.metrics2.MetricsSystem;
+import org.apache.hadoop.metrics2.annotation.Metric;
+import org.apache.hadoop.metrics2.annotation.Metrics;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
+import org.apache.hadoop.metrics2.lib.MutableCounterInt;
+import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
+import org.apache.hadoop.metrics2.lib.MutableRate;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * This class captures the container data scrubber metrics on the data-node.
+ **/
+@InterfaceAudience.Private
+@Metrics(about="DataNode container data scrubber metrics", context="dfs")
+public final class ContainerDataScrubberMetrics {
+  private final String name;
+  private final MetricsSystem ms;
+  @Metric("number of containers scanned in the current iteration")
+  private MutableGaugeInt numContainersScanned;
+  @Metric("number of unhealthy containers found in the current iteration")
+  private MutableGaugeInt numUnHealthyContainers;
+  @Metric("number of iterations of scanner completed since the restart")
+  private MutableCounterInt numScanIterations;
+  @Metric("disk bandwidth used by the container data scrubber per volume")
+  private MutableRate numBytesScanned;
+
+  public int getNumContainersScanned() {
+    return numContainersScanned.value();
+  }
+
+  public void incNumContainersScanned() {
+    numContainersScanned.incr();
+  }
+
+  public void resetNumContainersScanned() {
+    numContainersScanned.decr(getNumContainersScanned());
+  }
+
+  public int getNumUnHealthyContainers() {
+    return numUnHealthyContainers.value();
+  }
+
+  public void incNumUnHealthyContainers() {
+    numUnHealthyContainers.incr();
+  }
+
+  public void resetNumUnhealthyContainers() {
+    numUnHealthyContainers.decr(getNumUnHealthyContainers());
+  }
+
+  public int getNumScanIterations() {
+    return numScanIterations.value();
+  }
+
+  public void incNumScanIterations() {
+    numScanIterations.incr();
+  }
+
+  public double getNumBytesScannedMean() {
+    return numBytesScanned.lastStat().mean();
+  }
+
+  public long getNumBytesScannedSampleCount() {
+    return numBytesScanned.lastStat().numSamples();
+  }
+
+  public double getNumBytesScannedStdDev() {
+    return numBytesScanned.lastStat().stddev();
+  }
+
+  public void incNumBytesScanned(long bytes) {
+    numBytesScanned.add(bytes);
+  }
+
+  public void unregister() {
+    ms.unregisterSource(name);
+  }
+
+  private ContainerDataScrubberMetrics(String name, MetricsSystem ms) {
+    this.name = name;
+    this.ms = ms;
+  }
+
+  public static ContainerDataScrubberMetrics create(final Configuration conf,
+                                             final String volumeName) {
+    MetricsSystem ms = DefaultMetricsSystem.instance();
+    String name = "ContainerDataScrubberMetrics-"+ (volumeName.isEmpty()
+        ? "UndefinedDataNodeVolume"+ ThreadLocalRandom.current().nextInt()
+        : volumeName.replace(':', '-'));
+
+    return ms.register(name, null, new ContainerDataScrubberMetrics(name, ms));
+  }
+}

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/ContainerMetadataScanner.java

@@ -18,6 +18,7 @@
 package org.apache.hadoop.ozone.container.ozoneimpl;
 
 import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ozone.container.common.interfaces.Container;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -36,16 +37,19 @@ public class ContainerMetadataScanner extends Thread {
 
   private final ContainerController controller;
   private final long metadataScanInterval;
+  private final ContainerMetadataScrubberMetrics metrics;
   /**
    * True if the thread is stopping.<p/>
    * Protected by this object's lock.
    */
   private boolean stopping = false;
 
-  public ContainerMetadataScanner(ContainerController controller,
+  public ContainerMetadataScanner(Configuration conf,
+                                  ContainerController controller,
                                   long metadataScanInterval) {
     this.controller = controller;
     this.metadataScanInterval = metadataScanInterval;
+    this.metrics = ContainerMetadataScrubberMetrics.create(conf);
     setName("ContainerMetadataScanner");
     setDaemon(true);
   }
@@ -58,10 +62,43 @@ public class ContainerMetadataScanner extends Thread {
     LOG.info("Background ContainerMetadataScanner starting up");
     while (!stopping) {
       long start = System.nanoTime();
-      scrub();
-      long interval = TimeUnit.NANOSECONDS.toMillis(System.nanoTime()-start);
+      runIteration();
+      if(!stopping) {
+        metrics.resetNumUnhealthyContainers();
+        metrics.resetNumContainersScanned();
+      }
+    }
+  }
+
+  @VisibleForTesting
+  public void runIteration() {
+    long start = System.nanoTime();
+    Iterator<Container> containerIt = controller.getContainers();
+    while (!stopping && containerIt.hasNext()) {
+      Container container = containerIt.next();
+      try {
+        scrub(container);
+      } catch (IOException e) {
+        LOG.info("Unexpected error while scrubbing container {}",
+            container.getContainerData().getContainerID());
+      } finally {
+        metrics.incNumContainersScanned();
+      }
+    }
+    long interval = System.nanoTime()-start;
+    if (!stopping) {
+      metrics.incNumScanIterations();
+      LOG.info("Completed an iteration of container metadata scrubber in" +
+              " {} minutes." +
+              " Number of  iterations (since the data-node restart) : {}" +
+              ", Number of containers scanned in this iteration : {}" +
+              ", Number of unhealthy containers found in this iteration : {}",
+          TimeUnit.NANOSECONDS.toMinutes(interval),
+          metrics.getNumScanIterations(),
+          metrics.getNumContainersScanned(),
+          metrics.getNumUnHealthyContainers());
       // ensure to delay next metadata scan with respect to user config.
-      if (!stopping && interval < metadataScanInterval) {
+      if (interval < metadataScanInterval) {
         try {
           Thread.sleep(metadataScanInterval - interval);
         } catch (InterruptedException e) {
@@ -72,32 +109,20 @@ public class ContainerMetadataScanner extends Thread {
     }
   }
 
-  private void scrub() {
-    Iterator<Container> containerIt = controller.getContainers();
-    long count = 0;
-
-    while (!stopping && containerIt.hasNext()) {
-      Container container = containerIt.next();
-      try {
-        scrub(container);
-      } catch (IOException e) {
-        LOG.info("Unexpected error while scrubbing container {}",
-            container.getContainerData().getContainerID());
-      }
-      count++;
-    }
-
-    LOG.debug("iterator ran integrity checks on {} containers", count);
-  }
-
   @VisibleForTesting
   public void scrub(Container container) throws IOException {
     if (!container.scanMetaData()) {
+      metrics.incNumUnHealthyContainers();
       controller.markContainerUnhealthy(
           container.getContainerData().getContainerID());
     }
   }
 
+  @VisibleForTesting
+  public ContainerMetadataScrubberMetrics getMetrics() {
+    return metrics;
+  }
+
   public synchronized void shutdown() {
     this.stopping = true;
     this.interrupt();

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/ContainerMetadataScrubberMetrics.java

@@ -0,0 +1,93 @@
+/**
+ * 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.ozoneimpl;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.metrics2.MetricsSystem;
+import org.apache.hadoop.metrics2.annotation.Metric;
+import org.apache.hadoop.metrics2.annotation.Metrics;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
+import org.apache.hadoop.metrics2.lib.MutableCounterInt;
+import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
+
+/**
+ * This class captures the container meta-data scrubber metrics on the
+ * data-node.
+ **/
+@InterfaceAudience.Private
+@Metrics(about="DataNode container data scrubber metrics", context="dfs")
+public final class ContainerMetadataScrubberMetrics {
+  private final String name;
+  private final MetricsSystem ms;
+  @Metric("number of containers scanned in the current iteration")
+  private MutableGaugeInt numContainersScanned;
+  @Metric("number of unhealthy containers found in the current iteration")
+  private MutableGaugeInt numUnHealthyContainers;
+  @Metric("number of iterations of scanner completed since the restart")
+  private MutableCounterInt numScanIterations;
+
+  public int getNumContainersScanned() {
+    return numContainersScanned.value();
+  }
+
+  public void incNumContainersScanned() {
+    numContainersScanned.incr();
+  }
+
+  public void resetNumContainersScanned() {
+    numContainersScanned.decr(getNumContainersScanned());
+  }
+
+  public int getNumUnHealthyContainers() {
+    return numUnHealthyContainers.value();
+  }
+
+  public void incNumUnHealthyContainers() {
+    numUnHealthyContainers.incr();
+  }
+
+  public void resetNumUnhealthyContainers() {
+    numUnHealthyContainers.decr(getNumUnHealthyContainers());
+  }
+
+  public int getNumScanIterations() {
+    return numScanIterations.value();
+  }
+
+  public void incNumScanIterations() {
+    numScanIterations.incr();
+  }
+
+  public void unregister() {
+    ms.unregisterSource(name);
+  }
+
+  private ContainerMetadataScrubberMetrics(String name, MetricsSystem ms) {
+    this.name = name;
+    this.ms = ms;
+  }
+
+  public static ContainerMetadataScrubberMetrics create(Configuration conf) {
+    MetricsSystem ms = DefaultMetricsSystem.instance();
+    String name = "ContainerDataScrubberMetrics";
+    return ms.register(name, null,
+        new ContainerMetadataScrubberMetrics(name, ms));
+  }
+
+}

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/ozoneimpl/OzoneContainer.java

@@ -178,14 +178,14 @@ public class OzoneContainer {
       LOG.info("Background container scanner has been disabled.");
     } else {
       if (this.metadataScanner == null) {
-        this.metadataScanner = new ContainerMetadataScanner(controller,
+        this.metadataScanner = new ContainerMetadataScanner(config, controller,
             metadataScanInterval);
       }
       this.metadataScanner.start();
 
       dataScanners = new ArrayList<>();
       for (HddsVolume v : volumeSet.getVolumesList()) {
-        ContainerDataScanner s = new ContainerDataScanner(controller,
+        ContainerDataScanner s = new ContainerDataScanner(config, controller,
             v, bytesPerSec);
         s.start();
         dataScanners.add(s);

hadoop-hdds/container-service/src/test/java/org/apache/hadoop/ozone/container/ozoneimpl/TestContainerScrubberMetrics.java

@@ -0,0 +1,113 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.ozoneimpl;
+
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdfs.util.Canceler;
+import org.apache.hadoop.hdfs.util.DataTransferThrottler;
+import org.apache.hadoop.ozone.container.common.impl.ContainerData;
+import org.apache.hadoop.ozone.container.common.interfaces.Container;
+import org.apache.hadoop.ozone.container.common.volume.HddsVolume;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.util.Iterator;
+
+/**
+ * This test verifies the container scrubber metrics functionality.
+ */
+public class TestContainerScrubberMetrics {
+  @Test
+  public void testContainerMetaDataScrubberMetrics() {
+    OzoneConfiguration conf = new OzoneConfiguration();
+    ContainerScrubberConfiguration c = conf.getObject(
+        ContainerScrubberConfiguration.class);
+    c.setMetadataScanInterval(0);
+    HddsVolume vol = Mockito.mock(HddsVolume.class);
+    ContainerController cntrl = mockContainerController(vol);
+
+    ContainerMetadataScanner mc = new ContainerMetadataScanner(conf,
+        cntrl, c.getMetadataScanInterval());
+    mc.runIteration();
+
+    Assert.assertEquals(1, mc.getMetrics().getNumScanIterations());
+    Assert.assertEquals(3, mc.getMetrics().getNumContainersScanned());
+    Assert.assertEquals(1, mc.getMetrics().getNumUnHealthyContainers());
+  }
+
+  @Test
+  public void testContainerDataScrubberMetrics() {
+    OzoneConfiguration conf = new OzoneConfiguration();
+    ContainerScrubberConfiguration c = conf.getObject(
+        ContainerScrubberConfiguration.class);
+    HddsVolume vol = Mockito.mock(HddsVolume.class);
+    ContainerController cntrl = mockContainerController(vol);
+
+    ContainerDataScanner sc = new ContainerDataScanner(conf, cntrl,
+        vol, c.getBandwidthPerVolume());
+    sc.runIteration();
+
+    ContainerDataScrubberMetrics m = sc.getMetrics();
+    Assert.assertEquals(1, m.getNumScanIterations());
+    Assert.assertEquals(2, m.getNumContainersScanned());
+    Assert.assertEquals(1, m.getNumUnHealthyContainers());
+  }
+
+  private ContainerController mockContainerController(HddsVolume vol) {
+    // healthy container
+    Container c1 = Mockito.mock(Container.class);
+    Mockito.when(c1.shouldScanData()).thenReturn(true);
+    Mockito.when(c1.scanMetaData()).thenReturn(true);
+    Mockito.when(c1.scanData(
+        Mockito.any(DataTransferThrottler.class),
+        Mockito.any(Canceler.class))).thenReturn(true);
+
+    // unhealthy container (corrupt data)
+    ContainerData c2d = Mockito.mock(ContainerData.class);
+    Mockito.when(c2d.getContainerID()).thenReturn(101L);
+    Container c2 = Mockito.mock(Container.class);
+    Mockito.when(c2.scanMetaData()).thenReturn(true);
+    Mockito.when(c2.shouldScanData()).thenReturn(true);
+    Mockito.when(c2.scanData(
+        Mockito.any(DataTransferThrottler.class),
+        Mockito.any(Canceler.class))).thenReturn(false);
+    Mockito.when(c2.getContainerData()).thenReturn(c2d);
+
+    // unhealthy container (corrupt metadata)
+    ContainerData c3d = Mockito.mock(ContainerData.class);
+    Mockito.when(c3d.getContainerID()).thenReturn(102L);
+    Container c3 = Mockito.mock(Container.class);
+    Mockito.when(c3.shouldScanData()).thenReturn(false);
+    Mockito.when(c3.scanMetaData()).thenReturn(false);
+    Mockito.when(c3.getContainerData()).thenReturn(c3d);
+
+    Iterator<Container> iter = Mockito.mock(Iterator.class);
+    Mockito.when(iter.hasNext()).thenReturn(true, true, true, false);
+    Mockito.when(iter.next()).thenReturn(c1, c2, c3);
+
+    ContainerController cntrl = Mockito.mock(ContainerController.class);
+    Mockito.when(cntrl.getContainers(vol))
+        .thenReturn(iter);
+    Mockito.when(cntrl.getContainers())
+        .thenReturn(iter);
+
+    return cntrl;
+  }
+
+}

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/dn/scrubber/TestDataScrubber.java

@@ -159,7 +159,7 @@ public class TestDataScrubber {
     deleteDirectory(chunksDir);
     Assert.assertFalse(chunksDir.exists());
 
-    ContainerMetadataScanner sb = new ContainerMetadataScanner(
+    ContainerMetadataScanner sb = new ContainerMetadataScanner(ozoneConfig,
         oc.getController(), 0);
     sb.scrub(c);