use of java.util.UUID in project hadoop by apache.
the class ClientId method getClientId.
/**
* Return clientId as byte[]
*/
public static byte[] getClientId() {
UUID uuid = UUID.randomUUID();
ByteBuffer buf = ByteBuffer.wrap(new byte[BYTE_LENGTH]);
buf.putLong(uuid.getMostSignificantBits());
buf.putLong(uuid.getLeastSignificantBits());
return buf.array();
}
use of java.util.UUID in project flink by apache.
the class FlinkUntypedActorTest method testThrowingExceptionWhenReceivingNonWrappedRequiresLeaderSessionIDMessage.
/**
* Tests that an exception is thrown, when the FlinkUntypedActore receives a message which
* extends {@link RequiresLeaderSessionID} and is not wrapped in a LeaderSessionMessage.
*/
@Test
public void testThrowingExceptionWhenReceivingNonWrappedRequiresLeaderSessionIDMessage() {
final UUID leaderSessionID = UUID.randomUUID();
TestActorRef<PlainFlinkUntypedActor> actor = null;
try {
final Props props = Props.create(PlainFlinkUntypedActor.class, leaderSessionID);
actor = TestActorRef.create(actorSystem, props);
actor.receive(new JobManagerMessages.LeaderSessionMessage(leaderSessionID, 1));
try {
actor.receive(new PlainRequiresLeaderSessionID());
fail("Expected an exception to be thrown, because a RequiresLeaderSessionID" + "message was sent without being wrapped in LeaderSessionMessage.");
} catch (Exception e) {
assertEquals("Received a message PlainRequiresLeaderSessionID " + "without a leader session ID, even though the message requires a " + "leader session ID.", e.getMessage());
}
} finally {
stopActor(actor);
}
}
use of java.util.UUID in project flink by apache.
the class ZooKeeperLeaderElectionService method nodeChanged.
@Override
public void nodeChanged() throws Exception {
try {
// leaderSessionID is null if the leader contender has not yet confirmed the session ID
if (leaderLatch.hasLeadership()) {
synchronized (lock) {
if (LOG.isDebugEnabled()) {
LOG.debug("Leader node changed while {} is the leader with session ID {}.", leaderContender.getAddress(), confirmedLeaderSessionID);
}
if (confirmedLeaderSessionID != null) {
ChildData childData = cache.getCurrentData();
if (childData == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Writing leader information into empty node by {}.", leaderContender.getAddress());
}
writeLeaderInformation(confirmedLeaderSessionID);
} else {
byte[] data = childData.getData();
if (data == null || data.length == 0) {
// the data field seems to be empty, rewrite information
if (LOG.isDebugEnabled()) {
LOG.debug("Writing leader information into node with empty data field by {}.", leaderContender.getAddress());
}
writeLeaderInformation(confirmedLeaderSessionID);
} else {
ByteArrayInputStream bais = new ByteArrayInputStream(data);
ObjectInputStream ois = new ObjectInputStream(bais);
String leaderAddress = ois.readUTF();
UUID leaderSessionID = (UUID) ois.readObject();
if (!leaderAddress.equals(this.leaderContender.getAddress()) || (leaderSessionID == null || !leaderSessionID.equals(confirmedLeaderSessionID))) {
// the data field does not correspond to the expected leader information
if (LOG.isDebugEnabled()) {
LOG.debug("Correcting leader information by {}.", leaderContender.getAddress());
}
writeLeaderInformation(confirmedLeaderSessionID);
}
}
}
}
}
}
} catch (Exception e) {
leaderContender.handleError(new Exception("Could not handle node changed event.", e));
throw e;
}
}
use of java.util.UUID in project flink by apache.
the class SingleLeaderElectionServiceTest method testShutdown.
@Test
public void testShutdown() throws Exception {
final UUID uuid = UUID.randomUUID();
final SingleLeaderElectionService service = new SingleLeaderElectionService(executor, uuid);
// create a leader contender and let it grab leadership
final LeaderContender contender = mockContender(service);
service.start(contender);
verify(contender, times(1)).grantLeadership(uuid);
// some leader listeners
final LeaderRetrievalListener listener1 = mock(LeaderRetrievalListener.class);
final LeaderRetrievalListener listener2 = mock(LeaderRetrievalListener.class);
LeaderRetrievalService listenerService1 = service.createLeaderRetrievalService();
LeaderRetrievalService listenerService2 = service.createLeaderRetrievalService();
listenerService1.start(listener1);
listenerService2.start(listener2);
// one listener stops
listenerService1.stop();
// shut down the service
service.shutdown();
// the leader contender and running listener should get error notifications
verify(contender, times(1)).handleError(any(Exception.class));
verify(listener2, times(1)).handleError(any(Exception.class));
// the stopped listener gets no notification
verify(listener1, times(0)).handleError(any(Exception.class));
// should not be possible to start again after shutdown
try {
service.start(contender);
fail("should fail with an exception");
} catch (IllegalStateException e) {
// expected
}
// no additional leadership grant
verify(contender, times(1)).grantLeadership(any(UUID.class));
}
use of java.util.UUID in project flink by apache.
the class SingleLeaderElectionServiceTest method mockContender.
private static LeaderContender mockContender(final LeaderElectionService service, final String address) {
LeaderContender mockContender = mock(LeaderContender.class);
when(mockContender.getAddress()).thenReturn(address);
doAnswer(new Answer<Void>() {
@Override
public Void answer(InvocationOnMock invocation) throws Throwable {
final UUID uuid = (UUID) invocation.getArguments()[0];
service.confirmLeaderSessionID(uuid);
return null;
}
}).when(mockContender).grantLeadership(any(UUID.class));
return mockContender;
}
Aggregations