public virtual void TestMissingBlocksAlert()
{
MiniDFSCluster cluster = null;
try
{
Configuration conf = new HdfsConfiguration();
//minimize test delay
conf.SetInt(DFSConfigKeys.DfsNamenodeReplicationIntervalKey, 0);
conf.SetInt(DFSConfigKeys.DfsClientRetryWindowBase, 10);
int fileLen = 10 * 1024;
conf.SetInt(DFSConfigKeys.DfsBlockSizeKey, fileLen / 2);
//start a cluster with single datanode
cluster = new MiniDFSCluster.Builder(conf).Build();
cluster.WaitActive();
BlockManager bm = cluster.GetNamesystem().GetBlockManager();
DistributedFileSystem dfs = cluster.GetFileSystem();
// create a normal file
DFSTestUtil.CreateFile(dfs, new Path("/testMissingBlocksAlert/file1"), fileLen, (
short)3, 0);
Path corruptFile = new Path("/testMissingBlocks/corruptFile");
DFSTestUtil.CreateFile(dfs, corruptFile, fileLen, (short)3, 0);
// Corrupt the block
ExtendedBlock block = DFSTestUtil.GetFirstBlock(dfs, corruptFile);
NUnit.Framework.Assert.IsTrue(cluster.CorruptReplica(0, block));
// read the file so that the corrupt block is reported to NN
FSDataInputStream @in = dfs.Open(corruptFile);
try
{
@in.ReadFully(new byte[fileLen]);
}
catch (ChecksumException)
{
}
// checksum error is expected.
@in.Close();
Log.Info("Waiting for missing blocks count to increase...");
while (dfs.GetMissingBlocksCount() <= 0)
{
Sharpen.Thread.Sleep(100);
}
NUnit.Framework.Assert.IsTrue(dfs.GetMissingBlocksCount() == 1);
NUnit.Framework.Assert.AreEqual(4, dfs.GetUnderReplicatedBlocksCount());
NUnit.Framework.Assert.AreEqual(3, bm.GetUnderReplicatedNotMissingBlocks());
MBeanServer mbs = ManagementFactory.GetPlatformMBeanServer();
ObjectName mxbeanName = new ObjectName("Hadoop:service=NameNode,name=NameNodeInfo"
);
NUnit.Framework.Assert.AreEqual(1, (long)(long)mbs.GetAttribute(mxbeanName, "NumberOfMissingBlocks"
));
// now do the reverse : remove the file expect the number of missing
// blocks to go to zero
dfs.Delete(corruptFile, true);
Log.Info("Waiting for missing blocks count to be zero...");
while (dfs.GetMissingBlocksCount() > 0)
{
Sharpen.Thread.Sleep(100);
}
NUnit.Framework.Assert.AreEqual(2, dfs.GetUnderReplicatedBlocksCount());
NUnit.Framework.Assert.AreEqual(2, bm.GetUnderReplicatedNotMissingBlocks());
NUnit.Framework.Assert.AreEqual(0, (long)(long)mbs.GetAttribute(mxbeanName, "NumberOfMissingBlocks"
));
Path replOneFile = new Path("/testMissingBlocks/replOneFile");
DFSTestUtil.CreateFile(dfs, replOneFile, fileLen, (short)1, 0);
ExtendedBlock replOneBlock = DFSTestUtil.GetFirstBlock(dfs, replOneFile);
NUnit.Framework.Assert.IsTrue(cluster.CorruptReplica(0, replOneBlock));
// read the file so that the corrupt block is reported to NN
@in = dfs.Open(replOneFile);
try
{
@in.ReadFully(new byte[fileLen]);
}
catch (ChecksumException)
{
}
// checksum error is expected.
@in.Close();
NUnit.Framework.Assert.AreEqual(1, dfs.GetMissingReplOneBlocksCount());
NUnit.Framework.Assert.AreEqual(1, (long)(long)mbs.GetAttribute(mxbeanName, "NumberOfMissingBlocksWithReplicationFactorOne"
));
}
finally
{
if (cluster != null)
{
cluster.Shutdown();
}
}
}