How to use

contains

method

in

org.apache.hadoop.hdfs.server.blockmanagement.Host2NodesMap

hostmapLock.writeLock().lock();
try {
 if (node==null || contains(node)) {
  return false;

hostmapLock.writeLock().lock();
try {
 if (node==null || contains(node)) {
  return false;

hostmapLock.writeLock().lock();
try {
 if (node==null || contains(node)) {
  return false;

@Test
public void testContains() throws Exception {
 DatanodeDescriptor nodeNotInMap =
  DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/d1/r4");
 for (int i = 0; i < dataNodes.length; i++) {
  assertTrue(map.contains(dataNodes[i]));
 }
 assertFalse(map.contains(null));
 assertFalse(map.contains(nodeNotInMap));
}