/// <summary>
/// Test the scenario where the NN fails over after issuing a block
/// synchronization request, but before it is committed.
/// </summary>
/// <remarks>
/// Test the scenario where the NN fails over after issuing a block
/// synchronization request, but before it is committed. The
/// DN running the recovery should then fail to commit the synchronization
/// and a later retry will succeed.
/// </remarks>
/// <exception cref="System.Exception"/>
public virtual void TestFailoverRightBeforeCommitSynchronization()
{
Configuration conf = new Configuration();
// Disable permissions so that another user can recover the lease.
conf.SetBoolean(DFSConfigKeys.DfsPermissionsEnabledKey, false);
conf.SetInt(DFSConfigKeys.DfsBlockSizeKey, BlockSize);
FSDataOutputStream stm = null;
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).NnTopology(MiniDFSNNTopology
.SimpleHATopology()).NumDataNodes(3).Build();
try
{
cluster.WaitActive();
cluster.TransitionToActive(0);
Sharpen.Thread.Sleep(500);
Log.Info("Starting with NN 0 active");
FileSystem fs = HATestUtil.ConfigureFailoverFs(cluster, conf);
stm = fs.Create(TestPath);
// write a half block
AppendTestUtil.Write(stm, 0, BlockSize / 2);
stm.Hflush();
// Look into the block manager on the active node for the block
// under construction.
NameNode nn0 = cluster.GetNameNode(0);
ExtendedBlock blk = DFSTestUtil.GetFirstBlock(fs, TestPath);
DatanodeDescriptor expectedPrimary = DFSTestUtil.GetExpectedPrimaryNode(nn0, blk);
Log.Info("Expecting block recovery to be triggered on DN " + expectedPrimary);
// Find the corresponding DN daemon, and spy on its connection to the
// active.
DataNode primaryDN = cluster.GetDataNode(expectedPrimary.GetIpcPort());
DatanodeProtocolClientSideTranslatorPB nnSpy = DataNodeTestUtils.SpyOnBposToNN(primaryDN
, nn0);
// Delay the commitBlockSynchronization call
GenericTestUtils.DelayAnswer delayer = new GenericTestUtils.DelayAnswer(Log);
Org.Mockito.Mockito.DoAnswer(delayer).When(nnSpy).CommitBlockSynchronization(Org.Mockito.Mockito
.Eq(blk), Org.Mockito.Mockito.AnyInt(), Org.Mockito.Mockito.AnyLong(), Org.Mockito.Mockito
.Eq(true), Org.Mockito.Mockito.Eq(false), (DatanodeID[])Org.Mockito.Mockito.AnyObject
(), (string[])Org.Mockito.Mockito.AnyObject());
// new genstamp
// new length
// close file
// delete block
// new targets
// new target storages
DistributedFileSystem fsOtherUser = CreateFsAsOtherUser(cluster, conf);
NUnit.Framework.Assert.IsFalse(fsOtherUser.RecoverLease(TestPath));
Log.Info("Waiting for commitBlockSynchronization call from primary");
delayer.WaitForCall();
Log.Info("Failing over to NN 1");
cluster.TransitionToStandby(0);
cluster.TransitionToActive(1);
// Let the commitBlockSynchronization call go through, and check that
// it failed with the correct exception.
delayer.Proceed();
delayer.WaitForResult();
Exception t = delayer.GetThrown();
if (t == null)
{
NUnit.Framework.Assert.Fail("commitBlockSynchronization call did not fail on standby"
);
}
GenericTestUtils.AssertExceptionContains("Operation category WRITE is not supported"
, t);
// Now, if we try again to recover the block, it should succeed on the new
// active.
LoopRecoverLease(fsOtherUser, TestPath);
AppendTestUtil.Check(fs, TestPath, BlockSize / 2);
}
finally
{
IOUtils.CloseStream(stm);
cluster.Shutdown();
}
}
/// <summary>Test race between delete operation and commitBlockSynchronization method.
/// </summary>
/// <remarks>
/// Test race between delete operation and commitBlockSynchronization method.
/// See HDFS-6825.
/// </remarks>
/// <param name="hasSnapshot"/>
/// <exception cref="System.Exception"/>
private void TestDeleteAndCommitBlockSynchronizationRace(bool hasSnapshot)
{
Log.Info("Start testing, hasSnapshot: " + hasSnapshot);
AList <AbstractMap.SimpleImmutableEntry <string, bool> > testList = new AList <AbstractMap.SimpleImmutableEntry
<string, bool> >();
testList.AddItem(new AbstractMap.SimpleImmutableEntry <string, bool>("/test-file",
false));
testList.AddItem(new AbstractMap.SimpleImmutableEntry <string, bool>("/test-file1"
, true));
testList.AddItem(new AbstractMap.SimpleImmutableEntry <string, bool>("/testdir/testdir1/test-file"
, false));
testList.AddItem(new AbstractMap.SimpleImmutableEntry <string, bool>("/testdir/testdir1/test-file1"
, true));
Path rootPath = new Path("/");
Configuration conf = new Configuration();
// Disable permissions so that another user can recover the lease.
conf.SetBoolean(DFSConfigKeys.DfsPermissionsEnabledKey, false);
conf.SetInt(DFSConfigKeys.DfsBlockSizeKey, BlockSize);
FSDataOutputStream stm = null;
IDictionary <DataNode, DatanodeProtocolClientSideTranslatorPB> dnMap = new Dictionary
<DataNode, DatanodeProtocolClientSideTranslatorPB>();
try
{
cluster = new MiniDFSCluster.Builder(conf).NumDataNodes(3).Build();
cluster.WaitActive();
DistributedFileSystem fs = cluster.GetFileSystem();
int stId = 0;
foreach (AbstractMap.SimpleImmutableEntry <string, bool> stest in testList)
{
string testPath = stest.Key;
bool mkSameDir = stest.Value;
Log.Info("test on " + testPath + " mkSameDir: " + mkSameDir + " snapshot: " + hasSnapshot
);
Path fPath = new Path(testPath);
//find grandest non-root parent
Path grandestNonRootParent = fPath;
while (!grandestNonRootParent.GetParent().Equals(rootPath))
{
grandestNonRootParent = grandestNonRootParent.GetParent();
}
stm = fs.Create(fPath);
Log.Info("test on " + testPath + " created " + fPath);
// write a half block
AppendTestUtil.Write(stm, 0, BlockSize / 2);
stm.Hflush();
if (hasSnapshot)
{
SnapshotTestHelper.CreateSnapshot(fs, rootPath, "st" + stId.ToString());
++stId;
}
// Look into the block manager on the active node for the block
// under construction.
NameNode nn = cluster.GetNameNode();
ExtendedBlock blk = DFSTestUtil.GetFirstBlock(fs, fPath);
DatanodeDescriptor expectedPrimary = DFSTestUtil.GetExpectedPrimaryNode(nn, blk);
Log.Info("Expecting block recovery to be triggered on DN " + expectedPrimary);
// Find the corresponding DN daemon, and spy on its connection to the
// active.
DataNode primaryDN = cluster.GetDataNode(expectedPrimary.GetIpcPort());
DatanodeProtocolClientSideTranslatorPB nnSpy = dnMap[primaryDN];
if (nnSpy == null)
{
nnSpy = DataNodeTestUtils.SpyOnBposToNN(primaryDN, nn);
dnMap[primaryDN] = nnSpy;
}
// Delay the commitBlockSynchronization call
GenericTestUtils.DelayAnswer delayer = new GenericTestUtils.DelayAnswer(Log);
Org.Mockito.Mockito.DoAnswer(delayer).When(nnSpy).CommitBlockSynchronization(Org.Mockito.Mockito
.Eq(blk), Org.Mockito.Mockito.AnyInt(), Org.Mockito.Mockito.AnyLong(), Org.Mockito.Mockito
.Eq(true), Org.Mockito.Mockito.Eq(false), (DatanodeID[])Org.Mockito.Mockito.AnyObject
(), (string[])Org.Mockito.Mockito.AnyObject());
// new genstamp
// new length
// close file
// delete block
// new targets
// new target storages
fs.RecoverLease(fPath);
Log.Info("Waiting for commitBlockSynchronization call from primary");
delayer.WaitForCall();
Log.Info("Deleting recursively " + grandestNonRootParent);
fs.Delete(grandestNonRootParent, true);
if (mkSameDir && !grandestNonRootParent.ToString().Equals(testPath))
{
Log.Info("Recreate dir " + grandestNonRootParent + " testpath: " + testPath);
fs.Mkdirs(grandestNonRootParent);
}
delayer.Proceed();
Log.Info("Now wait for result");
delayer.WaitForResult();
Exception t = delayer.GetThrown();
if (t != null)
{
Log.Info("Result exception (snapshot: " + hasSnapshot + "): " + t);
}
}
// end of loop each fPath
Log.Info("Now check we can restart");
cluster.RestartNameNodes();
Log.Info("Restart finished");
}
finally
{
if (stm != null)
{
IOUtils.CloseStream(stm);
}
if (cluster != null)
{
cluster.Shutdown();
}
}
}
