/** Test that there are under replication blocks after vol failures */
@Test
public void testUnderReplicationAfterVolFailure() throws Exception {
// The test uses DataNodeTestUtils#injectDataDirFailure() to simulate
// volume failures which is currently not supported on Windows.
assumeTrue(!Path.WINDOWS);
// Bring up one more datanode
cluster.startDataNodes(conf, 1, true, null, null);
cluster.waitActive();
final BlockManager bm = cluster.getNamesystem().getBlockManager();
Path file1 = new Path("/test1");
DFSTestUtil.createFile(fs, file1, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file1, (short) 3);
// Fail the first volume on both datanodes
File dn1Vol1 = new File(dataDir, "data" + (2 * 0 + 1));
File dn2Vol1 = new File(dataDir, "data" + (2 * 1 + 1));
DataNodeTestUtils.injectDataDirFailure(dn1Vol1, dn2Vol1);
Path file2 = new Path("/test2");
DFSTestUtil.createFile(fs, file2, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file2, (short) 3);
// underReplicatedBlocks are due to failed volumes
int underReplicatedBlocks =
BlockManagerTestUtil.checkHeartbeatAndGetUnderReplicatedBlocksCount(
cluster.getNamesystem(), bm);
assertTrue(
"There is no under replicated block after volume failure", underReplicatedBlocks > 0);
}
/** Test that the NN re-learns of volume failures after restart. */
@Test
public void testVolFailureStatsPreservedOnNNRestart() throws Exception {
assumeTrue(!System.getProperty("os.name").startsWith("Windows"));
// Bring up two more datanodes that can tolerate 1 failure
cluster.startDataNodes(conf, 2, true, null, null);
cluster.waitActive();
final DatanodeManager dm = cluster.getNamesystem().getBlockManager().getDatanodeManager();
long origCapacity = DFSTestUtil.getLiveDatanodeCapacity(dm);
long dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0);
// Fail the first volume on both datanodes (we have to keep the
// third healthy so one node in the pipeline will not fail).
File dn1Vol1 = new File(dataDir, "data" + (2 * 0 + 1));
File dn2Vol1 = new File(dataDir, "data" + (2 * 1 + 1));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, false));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, false));
Path file1 = new Path("/test1");
DFSTestUtil.createFile(fs, file1, 1024, (short) 2, 1L);
DFSTestUtil.waitReplication(fs, file1, (short) 2);
// The NN reports two volumes failures
DFSTestUtil.waitForDatanodeStatus(
dm, 3, 0, 2, origCapacity - (1 * dnCapacity), WAIT_FOR_HEARTBEATS);
// After restarting the NN it still see the two failures
cluster.restartNameNode(0);
cluster.waitActive();
DFSTestUtil.waitForDatanodeStatus(
dm, 3, 0, 2, origCapacity - (1 * dnCapacity), WAIT_FOR_HEARTBEATS);
}
/* This test start a one-node cluster, fill the node to be 30% full;
* It then adds an empty node and start balancing.
* @param newCapacity new node's capacity
* @param new
*/
private void test(long[] capacities, String[] racks, long newCapacity, String newRack)
throws Exception {
int numOfDatanodes = capacities.length;
assertEquals(numOfDatanodes, racks.length);
cluster = new MiniDFSCluster(0, CONF, capacities.length, true, true, null, racks, capacities);
try {
cluster.waitActive();
client = DFSClient.createNamenode(CONF);
long totalCapacity = 0L;
for (long capacity : capacities) {
totalCapacity += capacity;
}
// fill up the cluster to be 30% full
long totalUsedSpace = totalCapacity * 3 / 10;
createFile(totalUsedSpace / numOfDatanodes, (short) numOfDatanodes);
// start up an empty node with the same capacity and on the same rack
cluster.startDataNodes(CONF, 1, true, null, new String[] {newRack}, new long[] {newCapacity});
totalCapacity += newCapacity;
// run balancer and validate results
runBalancer(totalUsedSpace, totalCapacity);
} finally {
cluster.shutdown();
}
}
/** do fsck */
public void testFsck() throws Exception {
DFSTestUtil util = new DFSTestUtil("TestFsck", 20, 3, 8 * 1024);
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
Configuration conf = new Configuration();
conf.setLong("dfs.blockreport.intervalMsec", 10000L);
cluster = new MiniDFSCluster(conf, 4, true, null);
fs = cluster.getFileSystem();
util.createFiles(fs, "/srcdat");
util.waitReplication(fs, "/srcdat", (short) 3);
String outStr = runFsck(conf, 0, true, "/");
assertTrue(outStr.contains(NamenodeFsck.HEALTHY_STATUS));
System.out.println(outStr);
if (fs != null) {
try {
fs.close();
} catch (Exception e) {
}
}
cluster.shutdown();
// restart the cluster; bring up namenode but not the data nodes
cluster = new MiniDFSCluster(conf, 0, false, null);
outStr = runFsck(conf, 1, true, "/");
// expect the result is corrupt
assertTrue(outStr.contains(NamenodeFsck.CORRUPT_STATUS));
System.out.println(outStr);
// bring up data nodes & cleanup cluster
cluster.startDataNodes(conf, 4, true, null, null);
cluster.waitActive();
cluster.waitClusterUp();
fs = cluster.getFileSystem();
util.cleanup(fs, "/srcdat");
} finally {
if (fs != null) {
try {
fs.close();
} catch (Exception e) {
}
}
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Checks whether {@link DataNode#checkDiskErrorAsync()} is being called or not. Before
* refactoring the code the above function was not getting called
*
* @throws IOException, InterruptedException
*/
@Test
public void testcheckDiskError() throws IOException, InterruptedException {
if (cluster.getDataNodes().size() <= 0) {
cluster.startDataNodes(conf, 1, true, null, null);
cluster.waitActive();
}
DataNode dataNode = cluster.getDataNodes().get(0);
long slackTime = dataNode.checkDiskErrorInterval / 2;
// checking for disk error
dataNode.checkDiskErrorAsync();
Thread.sleep(dataNode.checkDiskErrorInterval);
long lastDiskErrorCheck = dataNode.getLastDiskErrorCheck();
assertTrue(
"Disk Error check is not performed within " + dataNode.checkDiskErrorInterval + " ms",
((Time.monotonicNow() - lastDiskErrorCheck)
< (dataNode.checkDiskErrorInterval + slackTime)));
}
/** Test to check that a DN goes down when all its volumes have failed. */
@Test
public void testShutdown() throws Exception {
if (System.getProperty("os.name").startsWith("Windows")) {
/**
* This test depends on OS not allowing file creations on a directory that does not have write
* permissions for the user. Apparently it is not the case on Windows (at least under Cygwin),
* and possibly AIX. This is disabled on Windows.
*/
return;
}
// Bring up two more datanodes
cluster.startDataNodes(conf, 2, true, null, null);
cluster.waitActive();
final int dnIndex = 0;
String bpid = cluster.getNamesystem().getBlockPoolId();
File storageDir = cluster.getInstanceStorageDir(dnIndex, 0);
File dir1 = MiniDFSCluster.getRbwDir(storageDir, bpid);
storageDir = cluster.getInstanceStorageDir(dnIndex, 1);
File dir2 = MiniDFSCluster.getRbwDir(storageDir, bpid);
try {
// make the data directory of the first datanode to be readonly
assertTrue("Couldn't chmod local vol", dir1.setReadOnly());
assertTrue("Couldn't chmod local vol", dir2.setReadOnly());
// create files and make sure that first datanode will be down
DataNode dn = cluster.getDataNodes().get(dnIndex);
for (int i = 0; dn.isDatanodeUp(); i++) {
Path fileName = new Path("/test.txt" + i);
DFSTestUtil.createFile(fs, fileName, 1024, (short) 2, 1L);
DFSTestUtil.waitReplication(fs, fileName, (short) 2);
fs.delete(fileName, true);
}
} finally {
// restore its old permission
FileUtil.setWritable(dir1, true);
FileUtil.setWritable(dir2, true);
}
}
/**
* Test that individual volume failures do not cause DNs to fail, that all volumes failed on a
* single datanode do cause it to fail, and that the capacities and liveliness is adjusted
* correctly in the NN.
*/
@Test
public void testSuccessiveVolumeFailures() throws Exception {
assumeTrue(!System.getProperty("os.name").startsWith("Windows"));
// Bring up two more datanodes
cluster.startDataNodes(conf, 2, true, null, null);
cluster.waitActive();
/*
* Calculate the total capacity of all the datanodes. Sleep for
* three seconds to be sure the datanodes have had a chance to
* heartbeat their capacities.
*/
Thread.sleep(WAIT_FOR_HEARTBEATS);
final DatanodeManager dm = cluster.getNamesystem().getBlockManager().getDatanodeManager();
final long origCapacity = DFSTestUtil.getLiveDatanodeCapacity(dm);
long dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0);
File dn1Vol1 = new File(dataDir, "data" + (2 * 0 + 1));
File dn2Vol1 = new File(dataDir, "data" + (2 * 1 + 1));
File dn3Vol1 = new File(dataDir, "data" + (2 * 2 + 1));
File dn3Vol2 = new File(dataDir, "data" + (2 * 2 + 2));
/*
* Make the 1st volume directories on the first two datanodes
* non-accessible. We don't make all three 1st volume directories
* readonly since that would cause the entire pipeline to
* fail. The client does not retry failed nodes even though
* perhaps they could succeed because just a single volume failed.
*/
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, false));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, false));
/*
* Create file1 and wait for 3 replicas (ie all DNs can still
* store a block). Then assert that all DNs are up, despite the
* volume failures.
*/
Path file1 = new Path("/test1");
DFSTestUtil.createFile(fs, file1, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file1, (short) 3);
ArrayList<DataNode> dns = cluster.getDataNodes();
assertTrue("DN1 should be up", dns.get(0).isDatanodeUp());
assertTrue("DN2 should be up", dns.get(1).isDatanodeUp());
assertTrue("DN3 should be up", dns.get(2).isDatanodeUp());
/*
* The metrics should confirm the volume failures.
*/
assertCounter("VolumeFailures", 1L, getMetrics(dns.get(0).getMetrics().name()));
assertCounter("VolumeFailures", 1L, getMetrics(dns.get(1).getMetrics().name()));
assertCounter("VolumeFailures", 0L, getMetrics(dns.get(2).getMetrics().name()));
// Ensure we wait a sufficient amount of time
assert (WAIT_FOR_HEARTBEATS * 10) > WAIT_FOR_DEATH;
// Eventually the NN should report two volume failures
DFSTestUtil.waitForDatanodeStatus(
dm, 3, 0, 2, origCapacity - (1 * dnCapacity), WAIT_FOR_HEARTBEATS);
/*
* Now fail a volume on the third datanode. We should be able to get
* three replicas since we've already identified the other failures.
*/
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol1, false));
Path file2 = new Path("/test2");
DFSTestUtil.createFile(fs, file2, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file2, (short) 3);
assertTrue("DN3 should still be up", dns.get(2).isDatanodeUp());
assertCounter("VolumeFailures", 1L, getMetrics(dns.get(2).getMetrics().name()));
ArrayList<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>();
ArrayList<DatanodeDescriptor> dead = new ArrayList<DatanodeDescriptor>();
dm.fetchDatanodes(live, dead, false);
live.clear();
dead.clear();
dm.fetchDatanodes(live, dead, false);
assertEquals("DN3 should have 1 failed volume", 1, live.get(2).getVolumeFailures());
/*
* Once the datanodes have a chance to heartbeat their new capacity the
* total capacity should be down by three volumes (assuming the host
* did not grow or shrink the data volume while the test was running).
*/
dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0);
DFSTestUtil.waitForDatanodeStatus(
dm, 3, 0, 3, origCapacity - (3 * dnCapacity), WAIT_FOR_HEARTBEATS);
/*
* Now fail the 2nd volume on the 3rd datanode. All its volumes
* are now failed and so it should report two volume failures
* and that it's no longer up. Only wait for two replicas since
* we'll never get a third.
*/
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol2, false));
Path file3 = new Path("/test3");
DFSTestUtil.createFile(fs, file3, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file3, (short) 2);
// The DN should consider itself dead
DFSTestUtil.waitForDatanodeDeath(dns.get(2));
// And report two failed volumes
assertCounter("VolumeFailures", 2L, getMetrics(dns.get(2).getMetrics().name()));
// The NN considers the DN dead
DFSTestUtil.waitForDatanodeStatus(
dm, 2, 1, 2, origCapacity - (4 * dnCapacity), WAIT_FOR_HEARTBEATS);
/*
* The datanode never tries to restore the failed volume, even if
* it's subsequently repaired, but it should see this volume on
* restart, so file creation should be able to succeed after
* restoring the data directories and restarting the datanodes.
*/
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, true));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, true));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol1, true));
assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol2, true));
cluster.restartDataNodes();
cluster.waitActive();
Path file4 = new Path("/test4");
DFSTestUtil.createFile(fs, file4, 1024, (short) 3, 1L);
DFSTestUtil.waitReplication(fs, file4, (short) 3);
/*
* Eventually the capacity should be restored to its original value,
* and that the volume failure count should be reported as zero by
* both the metrics and the NN.
*/
DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 0, origCapacity, WAIT_FOR_HEARTBEATS);
}
/**
* Test that when there is a failure replicating a block the temporary and meta files are cleaned
* up and subsequent replication succeeds.
*/
@Test
public void testReplicationError() throws Exception {
// create a file of replication factor of 1
final Path fileName = new Path("/test.txt");
final int fileLen = 1;
DFSTestUtil.createFile(fs, fileName, 1, (short) 1, 1L);
DFSTestUtil.waitReplication(fs, fileName, (short) 1);
// get the block belonged to the created file
LocatedBlocks blocks =
NameNodeAdapter.getBlockLocations(
cluster.getNameNode(), fileName.toString(), 0, (long) fileLen);
assertEquals("Should only find 1 block", blocks.locatedBlockCount(), 1);
LocatedBlock block = blocks.get(0);
// bring up a second datanode
cluster.startDataNodes(conf, 1, true, null, null);
cluster.waitActive();
final int sndNode = 1;
DataNode datanode = cluster.getDataNodes().get(sndNode);
// replicate the block to the second datanode
InetSocketAddress target = datanode.getXferAddress();
Socket s = new Socket(target.getAddress(), target.getPort());
// write the header.
DataOutputStream out = new DataOutputStream(s.getOutputStream());
DataChecksum checksum = DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512);
new Sender(out)
.writeBlock(
block.getBlock(),
StorageType.DEFAULT,
BlockTokenSecretManager.DUMMY_TOKEN,
"",
new DatanodeInfo[0],
new StorageType[0],
null,
BlockConstructionStage.PIPELINE_SETUP_CREATE,
1,
0L,
0L,
0L,
checksum,
CachingStrategy.newDefaultStrategy(),
false);
out.flush();
// close the connection before sending the content of the block
out.close();
// the temporary block & meta files should be deleted
String bpid = cluster.getNamesystem().getBlockPoolId();
File storageDir = cluster.getInstanceStorageDir(sndNode, 0);
File dir1 = MiniDFSCluster.getRbwDir(storageDir, bpid);
storageDir = cluster.getInstanceStorageDir(sndNode, 1);
File dir2 = MiniDFSCluster.getRbwDir(storageDir, bpid);
while (dir1.listFiles().length != 0 || dir2.listFiles().length != 0) {
Thread.sleep(100);
}
// then increase the file's replication factor
fs.setReplication(fileName, (short) 2);
// replication should succeed
DFSTestUtil.waitReplication(fs, fileName, (short) 1);
// clean up the file
fs.delete(fileName, false);
}
