@After
public void tearDown() throws Exception {
if (data_fail != null) {
FileUtil.setWritable(data_fail, true);
data_fail = null;
}
if (failedDir != null) {
FileUtil.setWritable(failedDir, true);
failedDir = null;
}
if (cluster != null) {
cluster.shutdown();
cluster = null;
}
}
/** 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);
}
}
private static void revokePermissions(final File f) {
FileUtil.setWritable(f, false);
FileUtil.setExecutable(f, false);
FileUtil.setReadable(f, false);
}
private static void grantPermissions(final File f) {
FileUtil.setReadable(f, true);
FileUtil.setWritable(f, true);
FileUtil.setExecutable(f, true);
}