public void Run()
{
try
{
IList <LocatedBlock> locatedBlocks = cluster.GetNameNode().GetRpcServer().GetBlockLocations
(TestFile, 0, TestFileLen).GetLocatedBlocks();
LocatedBlock lblock = locatedBlocks[0];
BlockReader blockReader = null;
try
{
blockReader = BlockReaderTestUtil.GetBlockReader(cluster, lblock, 0, TestFileLen);
NUnit.Framework.Assert.Fail("expected getBlockReader to fail the first time.");
}
catch (Exception t)
{
NUnit.Framework.Assert.IsTrue("expected to see 'TCP reads were disabled " + "for testing' in exception "
+ t, t.Message.Contains("TCP reads were disabled for testing"));
}
finally
{
if (blockReader != null)
{
blockReader.Close();
}
}
gotFailureLatch.CountDown();
shouldRetryLatch.Await();
try
{
blockReader = BlockReaderTestUtil.GetBlockReader(cluster, lblock, 0, TestFileLen);
}
catch (Exception t)
{
TestBlockReaderFactory.Log.Error("error trying to retrieve a block reader " + "the second time."
, t);
throw;
}
finally
{
if (blockReader != null)
{
blockReader.Close();
}
}
}
catch (Exception t)
{
TestBlockReaderFactory.Log.Error("getBlockReader failure", t);
testFailed.Set(true);
}
}
public void Run()
{
try
{
while (true)
{
BlockReader blockReader = null;
try
{
blockReader = BlockReaderTestUtil.GetBlockReader(cluster, lblock, 0, TestFileLen);
sem.Release();
try
{
blockReader.ReadAll(buf, 0, TestFileLen);
}
finally
{
sem.AcquireUninterruptibly();
}
}
catch (ClosedByInterruptException e)
{
TestBlockReaderFactory.Log.Info("got the expected ClosedByInterruptException", e);
sem.Release();
break;
}
finally
{
if (blockReader != null)
{
blockReader.Close();
}
}
TestBlockReaderFactory.Log.Info("read another " + TestFileLen + " bytes.");
}
}
catch (Exception t)
{
TestBlockReaderFactory.Log.Error("getBlockReader failure", t);
testFailed.Set(true);
sem.Release();
}
}
/// <summary>
/// When an InterruptedException is sent to a thread calling
/// FileChannel#read, the FileChannel is immediately closed and the
/// thread gets an exception.
/// </summary>
/// <remarks>
/// When an InterruptedException is sent to a thread calling
/// FileChannel#read, the FileChannel is immediately closed and the
/// thread gets an exception. This effectively means that we might have
/// someone asynchronously calling close() on the file descriptors we use
/// in BlockReaderLocal. So when unreferencing a ShortCircuitReplica in
/// ShortCircuitCache#unref, we should check if the FileChannel objects
/// are still open. If not, we should purge the replica to avoid giving
/// it out to any future readers.
/// This is a regression test for HDFS-6227: Short circuit read failed
/// due to ClosedChannelException.
/// Note that you may still get ClosedChannelException errors if two threads
/// are reading from the same replica and an InterruptedException is delivered
/// to one of them.
/// </remarks>
/// <exception cref="System.Exception"/>
public virtual void TestPurgingClosedReplicas()
{
BlockReaderTestUtil.EnableBlockReaderFactoryTracing();
AtomicInteger replicasCreated = new AtomicInteger(0);
AtomicBoolean testFailed = new AtomicBoolean(false);
DFSInputStream.tcpReadsDisabledForTesting = true;
BlockReaderFactory.createShortCircuitReplicaInfoCallback = new _ShortCircuitReplicaCreator_443
(replicasCreated);
TemporarySocketDirectory sockDir = new TemporarySocketDirectory();
Configuration conf = CreateShortCircuitConf("testPurgingClosedReplicas", sockDir);
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).NumDataNodes(1).Build();
cluster.WaitActive();
DistributedFileSystem dfs = cluster.GetFileSystem();
string TestFile = "/test_file";
int TestFileLen = 4095;
int Seed = unchecked ((int)(0xFADE0));
DistributedFileSystem fs = (DistributedFileSystem)FileSystem.Get(cluster.GetURI(0
), conf);
DFSTestUtil.CreateFile(fs, new Path(TestFile), TestFileLen, (short)1, Seed);
Semaphore sem = Sharpen.Extensions.CreateSemaphore(0);
IList <LocatedBlock> locatedBlocks = cluster.GetNameNode().GetRpcServer().GetBlockLocations
(TestFile, 0, TestFileLen).GetLocatedBlocks();
LocatedBlock lblock = locatedBlocks[0];
// first block
byte[] buf = new byte[TestFileLen];
Runnable readerRunnable = new _Runnable_471(cluster, lblock, TestFileLen, sem, buf
, testFailed);
Sharpen.Thread thread = new Sharpen.Thread(readerRunnable);
thread.Start();
// While the thread is reading, send it interrupts.
// These should trigger a ClosedChannelException.
while (thread.IsAlive())
{
sem.AcquireUninterruptibly();
thread.Interrupt();
sem.Release();
}
NUnit.Framework.Assert.IsFalse(testFailed.Get());
// We should be able to read from the file without
// getting a ClosedChannelException.
BlockReader blockReader = null;
try
{
blockReader = BlockReaderTestUtil.GetBlockReader(cluster, lblock, 0, TestFileLen);
blockReader.ReadFully(buf, 0, TestFileLen);
}
finally
{
if (blockReader != null)
{
blockReader.Close();
}
}
byte[] expected = DFSTestUtil.CalculateFileContentsFromSeed(Seed, TestFileLen);
NUnit.Framework.Assert.IsTrue(Arrays.Equals(buf, expected));
// Another ShortCircuitReplica object should have been created.
NUnit.Framework.Assert.AreEqual(2, replicasCreated.Get());
dfs.Close();
cluster.Shutdown();
sockDir.Close();
}