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From vino...@apache.org
Subject svn commit: r1575465 - in /hadoop/common/branches/branch-2.4/hadoop-yarn-project: ./ hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/ hadoop-yarn/hadoop-yarn-common/src/main/resources/ hadoop-yarn/hadoop-yarn-server/hadoop-yarn-se...
Date Sat, 08 Mar 2014 00:52:48 GMT
Author: vinodkv
Date: Sat Mar  8 00:52:48 2014
New Revision: 1575465

URL: http://svn.apache.org/r1575465
Log:
YARN-1781. Modified NodeManagers to allow admins to specify max disk utilization for local
disks so as to be able to offline full disks. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1575463 ../../trunk/

Modified:
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/CHANGES.txt
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java
    hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDirectoryCollection.java

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/CHANGES.txt?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/CHANGES.txt (original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/CHANGES.txt Sat Mar  8 00:52:48
2014
@@ -226,6 +226,10 @@ Release 2.4.0 - UNRELEASED
     YARN-1525. Web UI should redirect to active RM when HA is enabled. (Cindy Li
     via kasha)
 
+    YARN-1781. Modified NodeManagers to allow admins to specify max disk
+    utilization for local disks so as to be able to offline full disks. (Varun
+    Vasudev via vinodkv)
+
   OPTIMIZATIONS
 
   BUG FIXES

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
(original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
Sat Mar  8 00:52:48 2014
@@ -717,32 +717,59 @@ public class YarnConfiguration extends C
   /** Class that calculates process tree resource utilization.*/
   public static final String NM_CONTAINER_MON_PROCESS_TREE =
     NM_PREFIX + "container-monitor.process-tree.class";
-
+  
+  /** Prefix for all node manager disk health checker configs. */
+  private static final String NM_DISK_HEALTH_CHECK_PREFIX =
+      "yarn.nodemanager.disk-health-checker.";
   /**
-   * Enable/Disable disks' health checker. Default is true.
-   * An expert level configuration property.
+   * Enable/Disable disks' health checker. Default is true. An expert level
+   * configuration property.
    */
   public static final String NM_DISK_HEALTH_CHECK_ENABLE =
-    NM_PREFIX + "disk-health-checker.enable";
-  /** Frequency of running disks' health checker.*/
+      NM_DISK_HEALTH_CHECK_PREFIX + "enable";
+  /** Frequency of running disks' health checker. */
   public static final String NM_DISK_HEALTH_CHECK_INTERVAL_MS =
-    NM_PREFIX + "disk-health-checker.interval-ms";
+      NM_DISK_HEALTH_CHECK_PREFIX + "interval-ms";
   /** By default, disks' health is checked every 2 minutes. */
   public static final long DEFAULT_NM_DISK_HEALTH_CHECK_INTERVAL_MS =
-    2 * 60 * 1000;
+      2 * 60 * 1000;
 
   /**
    * The minimum fraction of number of disks to be healthy for the nodemanager
    * to launch new containers. This applies to nm-local-dirs and nm-log-dirs.
    */
   public static final String NM_MIN_HEALTHY_DISKS_FRACTION =
-    NM_PREFIX + "disk-health-checker.min-healthy-disks";
+      NM_DISK_HEALTH_CHECK_PREFIX + "min-healthy-disks";
+  /**
+   * By default, at least 25% of disks are to be healthy to say that the node is
+   * healthy in terms of disks.
+   */
+  public static final float DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION = 0.25F;
+
+  /**
+   * The maximum percentage of disk space that can be used after which a disk is
+   * marked as offline. Values can range from 0.0 to 100.0. If the value is
+   * greater than or equal to 100, NM will check for full disk. This applies to
+   * nm-local-dirs and nm-log-dirs.
+   */
+  public static final String NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE =
+      NM_DISK_HEALTH_CHECK_PREFIX + "max-disk-utilization-per-disk-percentage";
+  /**
+   * By default, 100% of the disk can be used before it is marked as offline.
+   */
+  public static final float DEFAULT_NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE =
+      100.0F;
+
+  /**
+   * The minimum space that must be available on a local dir for it to be used.
+   * This applies to nm-local-dirs and nm-log-dirs.
+   */
+  public static final String NM_MIN_PER_DISK_FREE_SPACE_MB =
+      NM_DISK_HEALTH_CHECK_PREFIX + "min-free-space-per-disk-mb";
   /**
-   * By default, at least 25% of disks are to be healthy to say that the node
-   * is healthy in terms of disks.
+   * By default, all of the disk can be used before it is marked as offline.
    */
-  public static final float DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION
-    = 0.25F;
+  public static final long DEFAULT_NM_MIN_PER_DISK_FREE_SPACE_MB = 0;
 
   /** Frequency of running node health script.*/
   public static final String NM_HEALTH_CHECK_INTERVAL_MS = 

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
(original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
Sat Mar  8 00:52:48 2014
@@ -871,6 +871,24 @@
   </property>
 
   <property>
+    <description>The maximum percentage of disk space utilization allowed after 
+    which a disk is marked as bad. Values can range from 0.0 to 100.0. 
+    If the value is greater than or equal to 100, the nodemanager will check 
+    for full disk. This applies to yarn-nodemanager.local-dirs and 
+    yarn.nodemanager.log-dirs.</description>
+    <name>yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage</name>
+    <value>100.0</value>
+  </property>
+
+  <property>
+    <description>The minimum space that must be available on a disk for
+    it to be used. This applies to yarn-nodemanager.local-dirs and 
+    yarn.nodemanager.log-dirs.</description>
+    <name>yarn.nodemanager.disk-health-checker.min-free-space-per-disk-mb</name>
+    <value>0</value>
+  </property>
+
+  <property>
     <description>The path to the Linux container executor.</description>
     <name>yarn.nodemanager.linux-container-executor.path</name>
   </property>

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java
(original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DirectoryCollection.java
Sat Mar  8 00:52:48 2014
@@ -22,6 +22,7 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 
@@ -43,10 +44,80 @@ class DirectoryCollection {
   private List<String> localDirs;
   private List<String> failedDirs;
   private int numFailures;
+  
+  private float diskUtilizationPercentageCutoff;
+  private long diskUtilizationSpaceCutoff;
 
+  /**
+   * Create collection for the directories specified. No check for free space.
+   * 
+   * @param dirs
+   *          directories to be monitored
+   */
   public DirectoryCollection(String[] dirs) {
+    this(dirs, 100.0F, 0);
+  }
+
+  /**
+   * Create collection for the directories specified. Users must specify the
+   * maximum percentage of disk utilization allowed. Minimum amount of disk
+   * space is not checked.
+   * 
+   * @param dirs
+   *          directories to be monitored
+   * @param utilizationPercentageCutOff
+   *          percentage of disk that can be used before the dir is taken out of
+   *          the good dirs list
+   * 
+   */
+  public DirectoryCollection(String[] dirs, float utilizationPercentageCutOff) {
+    this(dirs, utilizationPercentageCutOff, 0);
+  }
+
+  /**
+   * Create collection for the directories specified. Users must specify the
+   * minimum amount of free space that must be available for the dir to be used.
+   * 
+   * @param dirs
+   *          directories to be monitored
+   * @param utilizationSpaceCutOff
+   *          minimum space, in MB, that must be available on the disk for the
+   *          dir to be marked as good
+   * 
+   */
+  public DirectoryCollection(String[] dirs, long utilizationSpaceCutOff) {
+    this(dirs, 100.0F, utilizationSpaceCutOff);
+  }
+
+  /**
+   * Create collection for the directories specified. Users must specify the
+   * maximum percentage of disk utilization allowed and the minimum amount of
+   * free space that must be available for the dir to be used. If either check
+   * fails the dir is removed from the good dirs list.
+   * 
+   * @param dirs
+   *          directories to be monitored
+   * @param utilizationPercentageCutOff
+   *          percentage of disk that can be used before the dir is taken out of
+   *          the good dirs list
+   * @param utilizationSpaceCutOff
+   *          minimum space, in MB, that must be available on the disk for the
+   *          dir to be marked as good
+   * 
+   */
+  public DirectoryCollection(String[] dirs, 
+      float utilizationPercentageCutOff,
+      long utilizationSpaceCutOff) {
     localDirs = new CopyOnWriteArrayList<String>(dirs);
     failedDirs = new CopyOnWriteArrayList<String>();
+    diskUtilizationPercentageCutoff = utilizationPercentageCutOff;
+    diskUtilizationSpaceCutoff = utilizationSpaceCutOff;
+    diskUtilizationPercentageCutoff =
+        utilizationPercentageCutOff < 0.0F ? 0.0F
+            : (utilizationPercentageCutOff > 100.0F ? 100.0F
+                : utilizationPercentageCutOff);
+    diskUtilizationSpaceCutoff =
+        utilizationSpaceCutOff < 0 ? 0 : utilizationSpaceCutOff;
   }
 
   /**
@@ -103,19 +174,55 @@ class DirectoryCollection {
    */
   synchronized boolean checkDirs() {
     int oldNumFailures = numFailures;
+    HashSet<String> checkFailedDirs = new HashSet<String>();
     for (final String dir : localDirs) {
       try {
-        DiskChecker.checkDir(new File(dir));
+        File testDir = new File(dir);
+        DiskChecker.checkDir(testDir);
+        if (isDiskUsageUnderPercentageLimit(testDir)) {
+          LOG.warn("Directory " + dir
+              + " error, used space above threshold of "
+              + diskUtilizationPercentageCutoff
+              + "%, removing from the list of valid directories.");
+          checkFailedDirs.add(dir);
+        } else if (isDiskFreeSpaceWithinLimit(testDir)) {
+          LOG.warn("Directory " + dir + " error, free space below limit of "
+              + diskUtilizationSpaceCutoff
+              + "MB, removing from the list of valid directories.");
+          checkFailedDirs.add(dir);
+        }
       } catch (DiskErrorException de) {
-        LOG.warn("Directory " + dir + " error " +
-            de.getMessage() + ", removing from the list of valid directories.");
-        localDirs.remove(dir);
-        failedDirs.add(dir);
-        numFailures++;
+        LOG.warn("Directory " + dir + " error " + de.getMessage()
+            + ", removing from the list of valid directories.");
+        checkFailedDirs.add(dir);
       }
     }
+    for (String dir : checkFailedDirs) {
+      localDirs.remove(dir);
+      failedDirs.add(dir);
+      numFailures++;
+    }
     return numFailures > oldNumFailures;
   }
+  
+  private boolean isDiskUsageUnderPercentageLimit(File dir) {
+    float freePercentage =
+        100 * (dir.getUsableSpace() / (float) dir.getTotalSpace());
+    float usedPercentage = 100.0F - freePercentage;
+    if (usedPercentage > diskUtilizationPercentageCutoff
+        || usedPercentage >= 100.0F) {
+      return true;
+    }
+    return false;
+  }
+
+  private boolean isDiskFreeSpaceWithinLimit(File dir) {
+    long freeSpace = dir.getUsableSpace() / (1024 * 1024);
+    if (freeSpace < this.diskUtilizationSpaceCutoff) {
+      return true;
+    }
+    return false;
+  }
 
   private void createDir(FileContext localFs, Path dir, FsPermission perm)
       throws IOException {
@@ -132,4 +239,26 @@ class DirectoryCollection {
       }
     }
   }
+  
+  public float getDiskUtilizationPercentageCutoff() {
+    return diskUtilizationPercentageCutoff;
+  }
+
+  public void setDiskUtilizationPercentageCutoff(
+      float diskUtilizationPercentageCutoff) {
+    this.diskUtilizationPercentageCutoff =
+        diskUtilizationPercentageCutoff < 0.0F ? 0.0F
+            : (diskUtilizationPercentageCutoff > 100.0F ? 100.0F
+                : diskUtilizationPercentageCutoff);
+  }
+
+  public long getDiskUtilizationSpaceCutoff() {
+    return diskUtilizationSpaceCutoff;
+  }
+
+  public void setDiskUtilizationSpaceCutoff(long diskUtilizationSpaceCutoff) {
+    diskUtilizationSpaceCutoff =
+        diskUtilizationSpaceCutoff < 0 ? 0 : diskUtilizationSpaceCutoff;
+    this.diskUtilizationSpaceCutoff = diskUtilizationSpaceCutoff;
+  }
 }

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java
(original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java
Sat Mar  8 00:52:48 2014
@@ -89,10 +89,22 @@ public class LocalDirsHandlerService ext
   private final class MonitoringTimerTask extends TimerTask {
 
     public MonitoringTimerTask(Configuration conf) throws YarnRuntimeException {
-      localDirs = new DirectoryCollection(
-          validatePaths(conf.getTrimmedStrings(YarnConfiguration.NM_LOCAL_DIRS)));
-      logDirs = new DirectoryCollection(
-          validatePaths(conf.getTrimmedStrings(YarnConfiguration.NM_LOG_DIRS)));
+      float maxUsableSpacePercentagePerDisk =
+          conf.getFloat(
+            YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE,
+            YarnConfiguration.DEFAULT_NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE);
+      long minFreeSpacePerDiskMB =
+          conf.getLong(YarnConfiguration.NM_MIN_PER_DISK_FREE_SPACE_MB,
+            YarnConfiguration.DEFAULT_NM_MIN_PER_DISK_FREE_SPACE_MB);
+      localDirs =
+          new DirectoryCollection(
+            validatePaths(conf
+              .getTrimmedStrings(YarnConfiguration.NM_LOCAL_DIRS)),
+            maxUsableSpacePercentagePerDisk, minFreeSpacePerDiskMB);
+      logDirs =
+          new DirectoryCollection(
+            validatePaths(conf.getTrimmedStrings(YarnConfiguration.NM_LOG_DIRS)),
+            maxUsableSpacePercentagePerDisk, minFreeSpacePerDiskMB);
       localDirsAllocator = new LocalDirAllocator(
           YarnConfiguration.NM_LOCAL_DIRS);
       logDirsAllocator = new LocalDirAllocator(YarnConfiguration.NM_LOG_DIRS);

Modified: hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDirectoryCollection.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDirectoryCollection.java?rev=1575465&r1=1575464&r2=1575465&view=diff
==============================================================================
--- hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDirectoryCollection.java
(original)
+++ hadoop/common/branches/branch-2.4/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDirectoryCollection.java
Sat Mar  8 00:52:48 2014
@@ -30,6 +30,7 @@ import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.junit.AfterClass;
 import org.junit.Assert;
 import org.junit.BeforeClass;
@@ -55,8 +56,11 @@ public class TestDirectoryCollection {
   @Test
   public void testConcurrentAccess() throws IOException {
     // Initialize DirectoryCollection with a file instead of a directory
+    Configuration conf = new Configuration();
     String[] dirs = {testFile.getPath()};
-    DirectoryCollection dc = new DirectoryCollection(dirs);
+    DirectoryCollection dc = new DirectoryCollection(dirs,
+      conf.getFloat(YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE, 
+        YarnConfiguration.DEFAULT_NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE));
 
     // Create an iterator before checkDirs is called to reliable test case
     List<String> list = dc.getGoodDirs();
@@ -88,7 +92,9 @@ public class TestDirectoryCollection {
     localFs.setPermission(pathC, permDirC);
 
     String[] dirs = { dirA, dirB, dirC };
-    DirectoryCollection dc = new DirectoryCollection(dirs);
+    DirectoryCollection dc = new DirectoryCollection(dirs,
+      conf.getFloat(YarnConfiguration.NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE, 
+        YarnConfiguration.DEFAULT_NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE));
     FsPermission defaultPerm = FsPermission.getDefault()
         .applyUMask(new FsPermission((short)FsPermission.DEFAULT_UMASK));
     boolean createResult = dc.createNonExistentDirs(localFs, defaultPerm);
@@ -104,4 +110,85 @@ public class TestDirectoryCollection {
     Assert.assertEquals("existing local directory permissions modified",
         permDirC, status.getPermission());
   }
+  
+  @Test
+  public void testDiskSpaceUtilizationLimit() throws IOException {
+
+    String dirA = new File(testDir, "dirA").getPath();
+    String[] dirs = { dirA };
+    DirectoryCollection dc = new DirectoryCollection(dirs, 0.0F);
+    dc.checkDirs();
+    Assert.assertEquals(0, dc.getGoodDirs().size());
+    Assert.assertEquals(1, dc.getFailedDirs().size());
+
+    dc = new DirectoryCollection(dirs, 100.0F);
+    dc.checkDirs();
+    Assert.assertEquals(1, dc.getGoodDirs().size());
+    Assert.assertEquals(0, dc.getFailedDirs().size());
+
+    dc = new DirectoryCollection(dirs, testDir.getTotalSpace() / (1024 * 1024));
+    dc.checkDirs();
+    Assert.assertEquals(0, dc.getGoodDirs().size());
+    Assert.assertEquals(1, dc.getFailedDirs().size());
+
+    dc = new DirectoryCollection(dirs, 100.0F, 0);
+    dc.checkDirs();
+    Assert.assertEquals(1, dc.getGoodDirs().size());
+    Assert.assertEquals(0, dc.getFailedDirs().size());
+  }
+
+  @Test
+  public void testDiskLimitsCutoffSetters() {
+
+    String[] dirs = { "dir" };
+    DirectoryCollection dc = new DirectoryCollection(dirs, 0.0F, 100);
+    float testValue = 57.5F;
+    float delta = 0.1F;
+    dc.setDiskUtilizationPercentageCutoff(testValue);
+    Assert.assertEquals(testValue, dc.getDiskUtilizationPercentageCutoff(),
+      delta);
+    testValue = -57.5F;
+    dc.setDiskUtilizationPercentageCutoff(testValue);
+    Assert.assertEquals(0.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    testValue = 157.5F;
+    dc.setDiskUtilizationPercentageCutoff(testValue);
+    Assert.assertEquals(100.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+
+    long spaceValue = 57;
+    dc.setDiskUtilizationSpaceCutoff(spaceValue);
+    Assert.assertEquals(spaceValue, dc.getDiskUtilizationSpaceCutoff());
+    spaceValue = -57;
+    dc.setDiskUtilizationSpaceCutoff(spaceValue);
+    Assert.assertEquals(0, dc.getDiskUtilizationSpaceCutoff());
+  }
+
+  @Test
+  public void testConstructors() {
+
+    String[] dirs = { "dir" };
+    float delta = 0.1F;
+    DirectoryCollection dc = new DirectoryCollection(dirs);
+    Assert.assertEquals(100.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(0, dc.getDiskUtilizationSpaceCutoff());
+
+    dc = new DirectoryCollection(dirs, 57.5F);
+    Assert.assertEquals(57.5F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(0, dc.getDiskUtilizationSpaceCutoff());
+
+    dc = new DirectoryCollection(dirs, 57);
+    Assert.assertEquals(100.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(57, dc.getDiskUtilizationSpaceCutoff());
+
+    dc = new DirectoryCollection(dirs, 57.5F, 67);
+    Assert.assertEquals(57.5F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(67, dc.getDiskUtilizationSpaceCutoff());
+
+    dc = new DirectoryCollection(dirs, -57.5F, -67);
+    Assert.assertEquals(0.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(0, dc.getDiskUtilizationSpaceCutoff());
+
+    dc = new DirectoryCollection(dirs, 157.5F, -67);
+    Assert.assertEquals(100.0F, dc.getDiskUtilizationPercentageCutoff(), delta);
+    Assert.assertEquals(0, dc.getDiskUtilizationSpaceCutoff());
+  }
 }



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