public virtual void TestLowResourceVolumePolicy()
{
Configuration conf = new Configuration();
FilePath nameDir1 = new FilePath(BaseDir, "name-dir1");
FilePath nameDir2 = new FilePath(BaseDir, "name-dir2");
nameDir1.Mkdirs();
nameDir2.Mkdirs();
conf.Set(DFSConfigKeys.DfsNamenodeEditsDirKey, nameDir1.GetAbsolutePath() + "," +
nameDir2.GetAbsolutePath());
conf.SetInt(DFSConfigKeys.DfsNamenodeCheckedVolumesMinimumKey, 2);
NameNodeResourceChecker nnrc = new NameNodeResourceChecker(conf);
// For the purpose of this test, we need to force the name dirs to appear to
// be on different volumes.
IDictionary <string, NameNodeResourceChecker.CheckedVolume> volumes = new Dictionary
<string, NameNodeResourceChecker.CheckedVolume>();
NameNodeResourceChecker.CheckedVolume volume1 = Org.Mockito.Mockito.Mock <NameNodeResourceChecker.CheckedVolume
>();
NameNodeResourceChecker.CheckedVolume volume2 = Org.Mockito.Mockito.Mock <NameNodeResourceChecker.CheckedVolume
>();
NameNodeResourceChecker.CheckedVolume volume3 = Org.Mockito.Mockito.Mock <NameNodeResourceChecker.CheckedVolume
>();
NameNodeResourceChecker.CheckedVolume volume4 = Org.Mockito.Mockito.Mock <NameNodeResourceChecker.CheckedVolume
>();
NameNodeResourceChecker.CheckedVolume volume5 = Org.Mockito.Mockito.Mock <NameNodeResourceChecker.CheckedVolume
>();
Org.Mockito.Mockito.When(volume1.IsResourceAvailable()).ThenReturn(true);
Org.Mockito.Mockito.When(volume2.IsResourceAvailable()).ThenReturn(true);
Org.Mockito.Mockito.When(volume3.IsResourceAvailable()).ThenReturn(true);
Org.Mockito.Mockito.When(volume4.IsResourceAvailable()).ThenReturn(true);
Org.Mockito.Mockito.When(volume5.IsResourceAvailable()).ThenReturn(true);
// Make volumes 4 and 5 required.
Org.Mockito.Mockito.When(volume4.IsRequired()).ThenReturn(true);
Org.Mockito.Mockito.When(volume5.IsRequired()).ThenReturn(true);
volumes["volume1"] = volume1;
volumes["volume2"] = volume2;
volumes["volume3"] = volume3;
volumes["volume4"] = volume4;
volumes["volume5"] = volume5;
nnrc.SetVolumes(volumes);
// Initially all dirs have space.
NUnit.Framework.Assert.IsTrue(nnrc.HasAvailableDiskSpace());
// 1/3 redundant dir is low on space.
Org.Mockito.Mockito.When(volume1.IsResourceAvailable()).ThenReturn(false);
NUnit.Framework.Assert.IsTrue(nnrc.HasAvailableDiskSpace());
// 2/3 redundant dirs are low on space.
Org.Mockito.Mockito.When(volume2.IsResourceAvailable()).ThenReturn(false);
NUnit.Framework.Assert.IsFalse(nnrc.HasAvailableDiskSpace());
// Lower the minimum number of redundant volumes that must be available.
nnrc.SetMinimumReduntdantVolumes(1);
NUnit.Framework.Assert.IsTrue(nnrc.HasAvailableDiskSpace());
// Just one required dir is low on space.
Org.Mockito.Mockito.When(volume3.IsResourceAvailable()).ThenReturn(false);
NUnit.Framework.Assert.IsFalse(nnrc.HasAvailableDiskSpace());
// Just the other required dir is low on space.
Org.Mockito.Mockito.When(volume3.IsResourceAvailable()).ThenReturn(true);
Org.Mockito.Mockito.When(volume4.IsResourceAvailable()).ThenReturn(false);
NUnit.Framework.Assert.IsFalse(nnrc.HasAvailableDiskSpace());
}
/// <summary>Add the volume of the passed-in directory to the list of volumes to check.
/// </summary>
/// <remarks>
/// Add the volume of the passed-in directory to the list of volumes to check.
/// If <code>required</code> is true, and this volume is already present, but
/// is marked redundant, it will be marked required. If the volume is already
/// present but marked required then this method is a no-op.
/// </remarks>
/// <param name="directoryToCheck">The directory whose volume will be checked for available space.
/// </param>
/// <exception cref="System.IO.IOException"/>
private void AddDirToCheck(URI directoryToCheck, bool required)
{
FilePath dir = new FilePath(directoryToCheck.GetPath());
if (!dir.Exists())
{
throw new IOException("Missing directory " + dir.GetAbsolutePath());
}
NameNodeResourceChecker.CheckedVolume newVolume = new NameNodeResourceChecker.CheckedVolume
(this, dir, required);
NameNodeResourceChecker.CheckedVolume volume = volumes[newVolume.GetVolume()];
if (volume == null || !volume.IsRequired())
{
volumes[newVolume.GetVolume()] = newVolume;
}
}