/** Check refreshNodes for decommissioning blacklisted nodes. */
public void testBlacklistedNodeDecommissioning() throws Exception {
LOG.info("Testing blacklisted node decommissioning");
MiniMRCluster mr = null;
JobTracker jt = null;
try {
// start mini mr
JobConf jtConf = new JobConf();
jtConf.set("mapred.max.tracker.blacklists", "1");
mr = new MiniMRCluster(0, 0, 2, "file:///", 1, null, null, null, jtConf);
jt = mr.getJobTrackerRunner().getJobTracker();
assertEquals("Trackers not up", 2, jt.taskTrackers().size());
// validate the total tracker count
assertEquals(
"Active tracker count mismatch", 2, jt.getClusterStatus(false).getTaskTrackers());
// validate blacklisted count
assertEquals(
"Blacklisted tracker count mismatch",
0,
jt.getClusterStatus(false).getBlacklistedTrackers());
// run a failing job to blacklist the tracker
JobConf jConf = mr.createJobConf();
jConf.set("mapred.max.tracker.failures", "1");
jConf.setJobName("test-job-fail-once");
jConf.setMapperClass(FailOnceMapper.class);
jConf.setReducerClass(IdentityReducer.class);
jConf.setNumMapTasks(1);
jConf.setNumReduceTasks(0);
RunningJob job =
UtilsForTests.runJob(jConf, new Path(TEST_DIR, "in"), new Path(TEST_DIR, "out"));
job.waitForCompletion();
// validate the total tracker count
assertEquals(
"Active tracker count mismatch", 1, jt.getClusterStatus(false).getTaskTrackers());
// validate blacklisted count
assertEquals(
"Blacklisted tracker count mismatch",
1,
jt.getClusterStatus(false).getBlacklistedTrackers());
// find the blacklisted tracker
String trackerName = null;
for (TaskTrackerStatus status : jt.taskTrackers()) {
if (jt.isBlacklisted(status.getTrackerName())) {
trackerName = status.getTrackerName();
break;
}
}
// get the hostname
String hostToDecommission = JobInProgress.convertTrackerNameToHostName(trackerName);
LOG.info("Decommissioning tracker " + hostToDecommission);
// decommission the node
HashSet<String> decom = new HashSet<String>(1);
decom.add(hostToDecommission);
jt.decommissionNodes(decom);
// validate
// check the cluster status and tracker size
assertEquals(
"Tracker is not lost upon host decommissioning",
1,
jt.getClusterStatus(false).getTaskTrackers());
assertEquals(
"Blacklisted tracker count incorrect in cluster status " + "after decommissioning",
0,
jt.getClusterStatus(false).getBlacklistedTrackers());
assertEquals("Tracker is not lost upon host decommissioning", 1, jt.taskTrackers().size());
} finally {
if (mr != null) {
mr.shutdown();
mr = null;
jt = null;
FileUtil.fullyDelete(new File(TEST_DIR.toString()));
}
}
}
