/// <summary>
/// Test cancellation of ongoing checkpoints when failover happens
/// mid-checkpoint.
/// </summary>
/// <exception cref="System.Exception"/>
public virtual void TestCheckpointCancellation()
{
cluster.TransitionToStandby(0);
// Create an edit log in the shared edits dir with a lot
// of mkdirs operations. This is solely so that the image is
// large enough to take a non-trivial amount of time to load.
// (only ~15MB)
URI sharedUri = cluster.GetSharedEditsDir(0, 1);
FilePath sharedDir = new FilePath(sharedUri.GetPath(), "current");
FilePath tmpDir = new FilePath(MiniDFSCluster.GetBaseDirectory(), "testCheckpointCancellation-tmp"
);
FSNamesystem fsn = cluster.GetNamesystem(0);
FSImageTestUtil.CreateAbortedLogWithMkdirs(tmpDir, NumDirsInLog, 3, fsn.GetFSDirectory
().GetLastInodeId() + 1);
string fname = NNStorage.GetInProgressEditsFileName(3);
new FilePath(tmpDir, fname).RenameTo(new FilePath(sharedDir, fname));
// Checkpoint as fast as we can, in a tight loop.
cluster.GetConfiguration(1).SetInt(DFSConfigKeys.DfsNamenodeCheckpointPeriodKey,
0);
cluster.RestartNameNode(1);
nn1 = cluster.GetNameNode(1);
cluster.TransitionToActive(0);
bool canceledOne = false;
for (int i = 0; i < 10 && !canceledOne; i++)
{
DoEdits(i * 10, i * 10 + 10);
cluster.TransitionToStandby(0);
cluster.TransitionToActive(1);
cluster.TransitionToStandby(1);
cluster.TransitionToActive(0);
canceledOne = StandbyCheckpointer.GetCanceledCount() > 0;
}
NUnit.Framework.Assert.IsTrue(canceledOne);
}
