diff --git a/hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md b/hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
index 336ad85054..a8bdbebdc7 100644
--- a/hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
+++ b/hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
@@ -334,8 +334,8 @@ FsVolume
 
 Per-volume metrics contain Datanode Volume IO related statistics. Per-volume
 metrics are off by default. They can be enabled by setting `dfs.datanode
-.fileio.profiling.percentage.fraction` to an integer value between 1 and 100.
-Setting this value to 0 would mean profiling is not enabled. But enabling
+.fileio.profiling.sampling.fraction` to a fraction between 0.0 and 1.0.
+Setting this value to 0.0 would mean profiling is not enabled. But enabling
 per-volume metrics may have a performance impact. Each metrics record
 contains tags such as Hostname as additional information along with metrics.
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
index 0ca344c8de..3fa383b9bd 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
@@ -731,10 +731,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final boolean
       DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_DEFAULT = false;
   public static final String
-      DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY =
-      "dfs.datanode.fileio.profiling.sampling.percentage";
-  public static final int
-      DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT = 0;
+      DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY =
+      "dfs.datanode.fileio.profiling.sampling.fraction";
+  public static final double
+      DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT = 0.0;
 
   //Keys with no defaults
   public static final String  DFS_DATANODE_PLUGINS_KEY = "dfs.datanode.plugins";
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
index a61aa78c28..c7bdca9c15 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
@@ -215,10 +215,9 @@ public class DatanodeManager {
     this.dataNodePeerStatsEnabled = conf.getBoolean(
         DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_KEY,
         DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_DEFAULT);
-    this.dataNodeDiskStatsEnabled = Util.isDiskStatsEnabled(conf.getInt(
-        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
-        DFSConfigKeys.
-            DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT));
+    this.dataNodeDiskStatsEnabled = Util.isDiskStatsEnabled(conf.getDouble(
+        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY,
+        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT));
 
     final Timer timer = new Timer();
     this.slowPeerTracker = dataNodePeerStatsEnabled ?
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java
index e9ceeb05be..fdb09df9da 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java
@@ -389,17 +389,17 @@ public static List<InetSocketAddress> getLoggerAddresses(URI uri,
     return addrsList;
   }
 
-  public static boolean isDiskStatsEnabled(int fileIOSamplingPercentage) {
+  public static boolean isDiskStatsEnabled(double fileIOSamplingFraction) {
     final boolean isEnabled;
-    if (fileIOSamplingPercentage <= 0) {
+    if (fileIOSamplingFraction < 0.000001) {
       LOG.info(DFSConfigKeys
-          .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY + " set to "
-          + fileIOSamplingPercentage + ". Disabling file IO profiling");
+          .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY + " set to "
+          + fileIOSamplingFraction + ". Disabling file IO profiling");
       isEnabled = false;
     } else {
       LOG.info(DFSConfigKeys
-          .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY + " set to "
-          + fileIOSamplingPercentage + ". Enabling file IO profiling");
+          .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY + " set to "
+          + fileIOSamplingFraction + ". Enabling file IO profiling");
       isEnabled = true;
     }
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java
index 8e5b59743f..21ffccc213 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java
@@ -175,10 +175,9 @@ public DNConf(final Configurable dn) {
     this.peerStatsEnabled = getConf().getBoolean(
         DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_KEY,
         DFSConfigKeys.DFS_DATANODE_PEER_STATS_ENABLED_DEFAULT);
-    this.diskStatsEnabled = Util.isDiskStatsEnabled(getConf().getInt(
-        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
-        DFSConfigKeys.
-            DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT));
+    this.diskStatsEnabled = Util.isDiskStatsEnabled(getConf().getDouble(
+        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY,
+        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT));
     this.outliersReportIntervalMs = getConf().getTimeDuration(
         DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY,
         DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_DEFAULT,
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FileIoProvider.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FileIoProvider.java
index 694eadd8c5..5508e0bdd2 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FileIoProvider.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FileIoProvider.java
@@ -62,8 +62,8 @@
  *
  * Behavior can be injected into these events by enabling the
  * profiling and/or fault injection event hooks through
- * {@link DFSConfigKeys#DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY}
- * and {@link DFSConfigKeys#DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY}.
+ * {@link DFSConfigKeys#DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY} and
+ * {@link DFSConfigKeys#DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY}.
  * These event hooks are disabled by default.
  *
  * Most functions accept an optional {@link FsVolumeSpi} parameter for
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ProfilingFileIoEvents.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ProfilingFileIoEvents.java
index 83ee5f6753..35118b2171 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ProfilingFileIoEvents.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ProfilingFileIoEvents.java
@@ -44,19 +44,18 @@ class ProfilingFileIoEvents {
 
   public ProfilingFileIoEvents(@Nullable Configuration conf) {
     if (conf != null) {
-      int fileIOSamplingPercentage = conf.getInt(
-          DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
+      double fileIOSamplingFraction = conf.getDouble(
+          DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY,
           DFSConfigKeys
-              .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT);
-      isEnabled = Util.isDiskStatsEnabled(fileIOSamplingPercentage);
-      if (fileIOSamplingPercentage > 100) {
+              .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT);
+      isEnabled = Util.isDiskStatsEnabled(fileIOSamplingFraction);
+      if (fileIOSamplingFraction > 1) {
         LOG.warn(DFSConfigKeys
-            .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY +
-            " value cannot be more than 100. Setting value to 100");
-        fileIOSamplingPercentage = 100;
+            .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY +
+            " value cannot be more than 1. Setting value to 1");
+        fileIOSamplingFraction = 1;
       }
-      sampleRangeMax = (int) ((double) fileIOSamplingPercentage / 100 *
-          Integer.MAX_VALUE);
+      sampleRangeMax = (int) (fileIOSamplingFraction * Integer.MAX_VALUE);
     } else {
       isEnabled = false;
       sampleRangeMax = 0;
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
index 0f33b709af..7fcea01165 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
@@ -2021,17 +2021,6 @@
   </description>
 </property>
 
-<property>
-  <name>dfs.datanode.fileio.profiling.sampling.percentage</name>
-  <value>0</value>
-  <description>
-    This setting controls the percentage of file I/O events which will be
-    profiled for DataNode disk statistics. The default value of 0 disables
-    disk statistics. Set to an integer value between 1 and 100 to enable disk
-    statistics.
-  </description>
-</property>
-
 <property>
   <name>hadoop.user.group.metrics.percentiles.intervals</name>
   <value></value>
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestSlowDiskTracker.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestSlowDiskTracker.java
index 172400d46d..16dfab208a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestSlowDiskTracker.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestSlowDiskTracker.java
@@ -28,7 +28,7 @@
 import com.google.common.collect.ImmutableMap;
 import org.apache.hadoop.conf.Configuration;
 import static org.apache.hadoop.hdfs.DFSConfigKeys
-    .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY;
+    .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys
     .DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY;
@@ -80,7 +80,7 @@ public class TestSlowDiskTracker {
   static {
     conf = new HdfsConfiguration();
     conf.setLong(DFS_HEARTBEAT_INTERVAL_KEY, 1L);
-    conf.setInt(DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY, 100);
+    conf.setDouble(DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY, 1.0);
     conf.setTimeDuration(DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY,
         OUTLIERS_REPORT_INTERVAL, TimeUnit.MILLISECONDS);
   }
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java
index faead188f5..b80976a2c3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java
@@ -218,8 +218,8 @@ private int getTotalNumBlocks(MBeanServer mbs, ObjectName mxbeanName)
   @Test
   public void testDataNodeMXBeanSlowDisksEnabled() throws Exception {
     Configuration conf = new Configuration();
-    conf.setInt(DFSConfigKeys
-        .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY, 100);
+    conf.setDouble(DFSConfigKeys
+        .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY, 1.0);
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
 
     try {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeMetrics.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeMetrics.java
index 0f41d2394b..03e1deea96 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeMetrics.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeMetrics.java
@@ -121,8 +121,8 @@ public void testVolumeMetricsWithVolumeDepartureArrival() throws Exception {
 
   private MiniDFSCluster setupClusterForVolumeMetrics() throws IOException {
     Configuration conf = new HdfsConfiguration();
-    conf.setInt(DFSConfigKeys
-        .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY, 100);
+    conf.setDouble(DFSConfigKeys
+        .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY, 1.0);
     SimulatedFSDataset.setFactory(conf);
     return new MiniDFSCluster.Builder(conf)
         .numDataNodes(NUM_DATANODES)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeStatusMXBean.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeStatusMXBean.java
index f9bfc37374..8fe734e44b 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeStatusMXBean.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeStatusMXBean.java
@@ -105,9 +105,8 @@ public void testNameNodeStatusMXBean() throws Exception {
   @Test
   public void testNameNodeMXBeanSlowDisksEnabled() throws Exception {
     Configuration conf = new Configuration();
-    conf.setInt(
-        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
-        100);
+    conf.setDouble(
+        DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY, 1.0);
     conf.setTimeDuration(
         DFSConfigKeys.DFS_DATANODE_OUTLIERS_REPORT_INTERVAL_KEY,
         1000, TimeUnit.MILLISECONDS);
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
index f23b26666c..1fdf713562 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
@@ -105,6 +105,8 @@ public void initializeMemberVariables() {
         .add(DFSConfigKeys.DFS_NAMENODE_STARTUP_KEY);
     configurationPropsToSkipCompare.add(DFSConfigKeys
         .DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY);
+    configurationPropsToSkipCompare.add(DFSConfigKeys
+        .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY);
 
     // Allocate
     xmlPropsToSkipCompare = new HashSet<String>();