@After
public void tearDown() {
// stop all NN
LOG.debug("tearDown");
for (LightWeightNameNode nn : nnList) {
nn.stop();
}
}
/** Test if the NN are correctly removed from the Active NN list */
@Test
public void testDeadNodesRemoval()
throws IOException, InterruptedException, CloneNotSupportedException {
LOG.debug("start testDeadNodesRemoval");
List<InetSocketAddress> isaList = new ArrayList<InetSocketAddress>();
// create 10 NN
for (int i = 0; i < 10; i++) {
LightWeightNameNode nn =
new LightWeightNameNode(
new HdfsLeDescriptorFactory(),
DFS_LEADER_CHECK_INTERVAL_IN_MS,
DFS_LEADER_MISSED_HB_THRESHOLD,
TIME_PERIOD_INCREMENT,
HTTP_ADDRESS,
"127.0.0.1:" + (50000 + i));
nnList.add(nn);
isaList.add(nn.getNameNodeAddress());
}
// wait for one HB and the first node should have complete list of nodes
Thread.sleep(DFS_LEADER_CHECK_INTERVAL_IN_MS * DFS_LEADER_MISSED_HB_THRESHOLD);
// verify that the number of active nn is equal to the number of started NN
List<ActiveNode> activesNNs = nnList.get(0).getActiveNameNodes().getActiveNodes();
assertTrue(
"wrong number of active NN " + activesNNs.size(), activesNNs.size() == nnList.size());
// verify that there is one and only one leader.
int leaderId = 0;
int nbLeaders = 0;
for (int i = 0; i < nnList.size(); i++) {
if (nnList.get(i).isLeader()) {
nbLeaders++;
leaderId = i;
}
}
assertTrue("there is no leader", nbLeaders > 0);
assertTrue("there is more than one leader", nbLeaders == 1);
// stop the leader
nnList.get(leaderId).stop();
Thread.sleep(DFS_LEADER_CHECK_INTERVAL_IN_MS * (DFS_LEADER_MISSED_HB_THRESHOLD + 2));
// verify that there is one and only one leader.
int newLeaderId = 0;
nbLeaders = 0;
for (int i = 0; i < nnList.size(); i++) {
if (i != leaderId) {
if (nnList.get(i).isLeader()) {
nbLeaders++;
newLeaderId = i;
}
}
}
assertTrue("there is no leader", nbLeaders > 0);
assertTrue("there is more than one leader", nbLeaders == 1);
// verify that the stoped leader is not in the active list anymore
activesNNs = nnList.get(newLeaderId).getActiveNameNodes().getActiveNodes();
for (ActiveNode ann : activesNNs) {
assertFalse(
"previous is stil in active nn",
ann.getInetSocketAddress().equals(isaList.get(leaderId)));
}
// stop NN last alive NN
int tokill = nnList.size() - 1;
while (leaderId == tokill || newLeaderId == tokill) {
tokill--;
}
LOG.debug("stopping node: " + nnList.get(tokill).getLeCurrentId());
nnList.get(tokill).stop();
Thread.sleep(DFS_LEADER_CHECK_INTERVAL_IN_MS * (DFS_LEADER_MISSED_HB_THRESHOLD + 2));
// verify that the killed NN is not in the active NN list anymore
activesNNs = nnList.get(newLeaderId).getActiveNameNodes().getActiveNodes();
assertTrue("wrong nb of active nn " + activesNNs.size(), activesNNs.size() == 8);
for (ActiveNode ann : activesNNs) {
assertFalse(
"killed nn is stil in active nn", ann.getInetSocketAddress().equals(isaList.get(tokill)));
}
}