apache · tasanuma · Mar 31, 2022 · Mar 30, 2022
diff --git a/...-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CachingGetSpaceUsed.java b/...-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CachingGetSpaceUsed.java
@@ -19,6 +19,7 @@
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.classification.VisibleForTesting;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -154,10 +155,20 @@ boolean running() {
   /**
    * How long in between runs of the background refresh.
    */
-  long getRefreshInterval() {
+  @VisibleForTesting
+  public long getRefreshInterval() {
     return refreshInterval;
   }
 
+  /**
+   * Randomize the refresh interval timing by this amount, the actual interval will be chosen
+   * uniformly between {@code interval-jitter} and {@code interval+jitter}.
+   */
+  @VisibleForTesting
+  public long getJitter() {
+    return jitter;
+  }
+
   /**
    * Reset the current used data amount. This should be called
    * when the cached value is re-computed.

diff --git a/...fs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java b/...fs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
@@ -20,6 +20,10 @@
 
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INITIAL_DELAY_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INITIAL_DELAY_KEY;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DU_INTERVAL_DEFAULT;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DU_INTERVAL_KEY;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_GETSPACEUSED_JITTER_DEFAULT;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_GETSPACEUSED_JITTER_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CACHEREPORT_INTERVAL_MSEC_DEFAULT;
@@ -144,6 +148,8 @@
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.server.datanode.checker.DatasetVolumeChecker;
 import org.apache.hadoop.hdfs.server.datanode.checker.StorageLocationChecker;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
 import org.apache.hadoop.hdfs.util.DataTransferThrottler;
 import org.apache.hadoop.util.AutoCloseableLock;
 import org.apache.hadoop.hdfs.client.BlockReportOptions;
@@ -344,7 +350,9 @@ public class DataNode extends ReconfigurableBase
               DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
               DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY,
               DFS_DATANODE_MIN_OUTLIER_DETECTION_DISKS_KEY,
-              DFS_DATANODE_SLOWDISK_LOW_THRESHOLD_MS_KEY));
+              DFS_DATANODE_SLOWDISK_LOW_THRESHOLD_MS_KEY,
+              FS_DU_INTERVAL_KEY,
+              FS_GETSPACEUSED_JITTER_KEY));
 
   public static final Log METRICS_LOG = LogFactory.getLog("DataNodeMetricsLog");
 
@@ -668,6 +676,9 @@ public String reconfigurePropertyImpl(String property, String newVal)
     case DFS_DATANODE_MIN_OUTLIER_DETECTION_DISKS_KEY:
     case DFS_DATANODE_SLOWDISK_LOW_THRESHOLD_MS_KEY:
       return reconfSlowDiskParameters(property, newVal);
+    case FS_DU_INTERVAL_KEY:
+    case FS_GETSPACEUSED_JITTER_KEY:
+      return reconfDfsUsageParameters(property, newVal);
     default:
       break;
     }
@@ -849,6 +860,43 @@ private String reconfSlowDiskParameters(String property, String newVal)
     }
   }
 
+  private String reconfDfsUsageParameters(String property, String newVal)
+      throws ReconfigurationException {
+    String result = null;
+    try {
+      LOG.info("Reconfiguring {} to {}", property, newVal);
+      if (property.equals(FS_DU_INTERVAL_KEY)) {
+        Preconditions.checkNotNull(data, "FsDatasetSpi has not been initialized.");
+        long interval = (newVal == null ? FS_DU_INTERVAL_DEFAULT :
+            Long.parseLong(newVal));
+        result = Long.toString(interval);
+        List<FsVolumeImpl> volumeList = data.getVolumeList();
+        for (FsVolumeImpl fsVolume : volumeList) {
+          Map<String, BlockPoolSlice> blockPoolSlices = fsVolume.getBlockPoolSlices();
+          for (BlockPoolSlice value : blockPoolSlices.values()) {
+            value.updateDfsUsageConfig(interval, null);
+          }
+        }
+      } else if (property.equals(FS_GETSPACEUSED_JITTER_KEY)) {
+        Preconditions.checkNotNull(data, "FsDatasetSpi has not been initialized.");
+        long jitter = (newVal == null ? FS_GETSPACEUSED_JITTER_DEFAULT :
+            Long.parseLong(newVal));
+        result = Long.toString(jitter);
+        List<FsVolumeImpl> volumeList = data.getVolumeList();
+        for (FsVolumeImpl fsVolume : volumeList) {
+          Map<String, BlockPoolSlice> blockPoolSlices = fsVolume.getBlockPoolSlices();
+          for (BlockPoolSlice value : blockPoolSlices.values()) {
+            value.updateDfsUsageConfig(null, jitter);
+          }
+        }
+      }
+      LOG.info("RECONFIGURE* changed {} to {}", property, newVal);
+      return result;
+    } catch (IllegalArgumentException | IOException e) {
+      throw new ReconfigurationException(property, newVal, getConf().get(property), e);
+    }
+  }
+
   /**
    * Get a list of the keys of the re-configurable properties in configuration.
    */

diff --git a/...oop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java b/...oop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java
@@ -36,6 +36,7 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.util.AutoCloseableLock;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
@@ -679,4 +680,9 @@ ReplicaInfo moveBlockAcrossVolumes(final ExtendedBlock block,
    * @throws IOException
    */
   Set<? extends Replica> deepCopyReplica(String bpid) throws IOException;
+
+  /**
+   * Get the volume list.
+   */
+  List<FsVolumeImpl> getVolumeList();
 }
diff --git a/...s/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java b/...s/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
@@ -47,6 +47,7 @@
 import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.hdfs.server.datanode.FSCachingGetSpaceUsed;
+import org.apache.hadoop.util.Preconditions;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -78,14 +79,17 @@
 
 import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DU_INTERVAL_KEY;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_GETSPACEUSED_JITTER_KEY;
+
 /**
  * A block pool slice represents a portion of a block pool stored on a volume.
  * Taken together, all BlockPoolSlices sharing a block pool ID across a
  * cluster represent a single block pool.
  *
  * This class is synchronized by {@link FsVolumeImpl}.
  */
-class BlockPoolSlice {
+public class BlockPoolSlice {
   static final Logger LOG = LoggerFactory.getLogger(BlockPoolSlice.class);
 
   private final String bpid;
@@ -111,6 +115,8 @@ class BlockPoolSlice {
   private final Timer timer;
   private final int maxDataLength;
   private final FileIoProvider fileIoProvider;
+  private final Configuration config;
+  private final File bpDir;
 
   private static ForkJoinPool addReplicaThreadPool = null;
   private static final int VOLUMES_REPLICA_ADD_THREADPOOL_SIZE = Runtime
@@ -124,7 +130,7 @@ public int compare(File f1, File f2) {
   };
 
   // TODO:FEDERATION scalability issue - a thread per DU is needed
-  private final GetSpaceUsed dfsUsage;
+  private volatile GetSpaceUsed dfsUsage;
 
   /**
    * Create a blook pool slice
@@ -137,6 +143,8 @@ public int compare(File f1, File f2) {
    */
   BlockPoolSlice(String bpid, FsVolumeImpl volume, File bpDir,
       Configuration conf, Timer timer) throws IOException {
+    this.config = conf;
+    this.bpDir = bpDir;
     this.bpid = bpid;
     this.volume = volume;
     this.fileIoProvider = volume.getFileIoProvider();
@@ -228,6 +236,35 @@ public void run() {
         SHUTDOWN_HOOK_PRIORITY);
   }
 
+  public void updateDfsUsageConfig(Long interval, Long jitter) throws IOException {
+    // Close the old dfsUsage if it is CachingGetSpaceUsed.
+    if (dfsUsage instanceof CachingGetSpaceUsed) {
+      ((CachingGetSpaceUsed) dfsUsage).close();
+    }
+    if (interval != null) {
+      Preconditions.checkArgument(interval > 0,
+          FS_DU_INTERVAL_KEY + " should be larger than 0");
+      config.setLong(FS_DU_INTERVAL_KEY, interval);
+    }
+    if (jitter != null) {
+      Preconditions.checkArgument(jitter >= 0,
+          FS_GETSPACEUSED_JITTER_KEY + " should be larger than or equal to 0");
+      config.setLong(FS_GETSPACEUSED_JITTER_KEY, jitter);
+    }
+    // Start new dfsUsage.
+    this.dfsUsage = new FSCachingGetSpaceUsed.Builder().setBpid(bpid)
+        .setVolume(volume)
+        .setPath(bpDir)
+        .setConf(config)
+        .setInitialUsed(loadDfsUsed())
+        .build();
+  }
+
+  @VisibleForTesting
+  public GetSpaceUsed getDfsUsage() {
+    return dfsUsage;
+  }
+
   private synchronized static void initializeAddReplicaPool(Configuration conf,
       FsDatasetImpl dataset) {
     if (addReplicaThreadPool == null) {

diff --git a/...fs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java b/...fs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
@@ -3431,5 +3431,10 @@ void stopAllDataxceiverThreads(FsVolumeImpl volume) {
       }
     }
   }
+
+  @Override
+  public List<FsVolumeImpl> getVolumeList() {
+    return volumes.getVolumes();
+  }
 }
 
diff --git a/...dfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java b/...dfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
@@ -493,6 +493,10 @@ long getRecentReserved() {
     return recentReserved;
   }
 
+  public Map<String, BlockPoolSlice> getBlockPoolSlices() {
+    return bpSlices;
+  }
+
   long getReserved(){
     return reserved != null ? reserved.getReserved() : 0;
   }

diff --git a/.../hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java b/.../hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
@@ -40,6 +40,7 @@
 import javax.management.ObjectName;
 import javax.management.StandardMBean;
 
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
 import org.apache.hadoop.thirdparty.com.google.common.math.LongMath;
 import org.apache.commons.lang3.ArrayUtils;
 import org.apache.hadoop.conf.Configuration;
@@ -1595,5 +1596,10 @@ public Set<? extends Replica> deepCopyReplica(String bpid)
     }
     return Collections.unmodifiableSet(replicas);
   }
+
+  @Override
+  public List<FsVolumeImpl> getVolumeList() {
+    return null;
+  }
 }
 
diff --git a/...dfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeReconfiguration.java b/...dfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeReconfiguration.java
@@ -19,6 +19,10 @@
 package org.apache.hadoop.hdfs.server.datanode;
 
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INITIAL_DELAY_KEY;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DU_INTERVAL_DEFAULT;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DU_INTERVAL_KEY;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_GETSPACEUSED_JITTER_DEFAULT;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_GETSPACEUSED_JITTER_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCKREPORT_SPLIT_THRESHOLD_KEY;
@@ -49,15 +53,21 @@
 import java.io.File;
 import java.io.IOException;
 import java.net.InetSocketAddress;
+import java.util.List;
+import java.util.Map;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.ReconfigurationException;
+import org.apache.hadoop.fs.CachingGetSpaceUsed;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.GetSpaceUsed;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.MiniDFSNNTopology;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
 import org.apache.hadoop.test.LambdaTestUtils;
 import org.junit.After;
 import org.junit.Assert;
@@ -673,4 +683,77 @@ public void testSlowDiskParameters() throws ReconfigurationException, IOExceptio
           dn.getDiskMetrics().getSlowDiskDetector().getLowThresholdMs());
     }
   }
+
+  @Test
+  public void testDfsUsageParameters() throws ReconfigurationException {
+    String[] dfsUsageParameters = {
+        FS_DU_INTERVAL_KEY,
+        FS_GETSPACEUSED_JITTER_KEY};
+
+    for (int i = 0; i < NUM_DATA_NODE; i++) {
+      DataNode dn = cluster.getDataNodes().get(i);
+
+      // Try invalid values.
+      for (String parameter : dfsUsageParameters) {
+        try {
+          dn.reconfigureProperty(parameter, "text");
+          fail("ReconfigurationException expected");
+        } catch (ReconfigurationException expected) {
+          assertTrue("expecting NumberFormatException",
+              expected.getCause() instanceof NumberFormatException);
+        }
+
+        try {
+          dn.reconfigureProperty(parameter, String.valueOf(-1));
+          fail("ReconfigurationException expected");
+        } catch (ReconfigurationException expected) {
+          assertTrue("expecting IllegalArgumentException",
+              expected.getCause() instanceof IllegalArgumentException);
+        }
+      }
+
+      // Change and verify properties.
+      for (String parameter : dfsUsageParameters) {
+        dn.reconfigureProperty(parameter, "99");
+      }
+      List<FsVolumeImpl> volumeList = dn.data.getVolumeList();
+      for (FsVolumeImpl fsVolume : volumeList) {
+        Map<String, BlockPoolSlice> blockPoolSlices = fsVolume.getBlockPoolSlices();
+        for (Map.Entry<String, BlockPoolSlice> entry : blockPoolSlices.entrySet()) {
+          GetSpaceUsed dfsUsage = entry.getValue().getDfsUsage();
+          if (dfsUsage instanceof CachingGetSpaceUsed) {
+            assertEquals(99,
+                ((CachingGetSpaceUsed) entry.getValue().getDfsUsage()).getRefreshInterval());
+            assertEquals(99,
+                ((CachingGetSpaceUsed) entry.getValue().getDfsUsage()).getJitter());
+          }
+        }
+      }
+
+      // Revert to default and verify.
+      for (String parameter : dfsUsageParameters) {
+        dn.reconfigureProperty(parameter, null);
+      }
+      for (FsVolumeImpl fsVolume : volumeList) {
+        Map<String, BlockPoolSlice> blockPoolSlices = fsVolume.getBlockPoolSlices();
+        for (Map.Entry<String, BlockPoolSlice> entry : blockPoolSlices.entrySet()) {
+          GetSpaceUsed dfsUsage = entry.getValue().getDfsUsage();
+          if (dfsUsage instanceof CachingGetSpaceUsed) {
+            assertEquals(String.format("expect %s is not configured",
+                FS_DU_INTERVAL_KEY), FS_DU_INTERVAL_DEFAULT,
+                ((CachingGetSpaceUsed) entry.getValue().getDfsUsage()).getRefreshInterval());
+            assertEquals(String.format("expect %s is not configured",
+                FS_GETSPACEUSED_JITTER_KEY), FS_GETSPACEUSED_JITTER_DEFAULT,
+                ((CachingGetSpaceUsed) entry.getValue().getDfsUsage()).getJitter());
+          }
+          assertEquals(String.format("expect %s is not configured",
+              FS_DU_INTERVAL_KEY), null,
+              dn.getConf().get(FS_DU_INTERVAL_KEY));
+          assertEquals(String.format("expect %s is not configured",
+              FS_GETSPACEUSED_JITTER_KEY), null,
+              dn.getConf().get(FS_GETSPACEUSED_JITTER_KEY));
+        }
+      }
+    }
+  }
 }
diff --git a/.../src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java b/.../src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java
@@ -24,6 +24,7 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.util.AutoCloseableLock;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
@@ -465,4 +466,9 @@ public Set<? extends Replica> deepCopyReplica(String bpid)
       throws IOException {
     return Collections.EMPTY_SET;
   }
+
+  @Override
+  public List<FsVolumeImpl> getVolumeList() {
+    return null;
+  }
 }