use of org.apache.bookkeeper.discover.RegistrationClient.RegistrationListener in project bookkeeper by apache.
the class TestZkRegistrationClient method testWatchBookiesTwice.
private void testWatchBookiesTwice(boolean isWritable) throws Exception {
int zkCallbackDelayMs = 100;
Set<BookieSocketAddress> addresses = prepareNBookies(10);
List<String> children = Lists.newArrayList();
for (BookieSocketAddress address : addresses) {
children.add(address.toString());
}
Stat stat = mock(Stat.class);
when(stat.getCversion()).thenReturn(1234);
mockGetChildren(isWritable ? regPath : regReadonlyPath, true, Code.OK.intValue(), children, stat, zkCallbackDelayMs);
CompletableFuture<Versioned<Set<BookieSocketAddress>>> firstResult = new CompletableFuture<>();
RegistrationListener firstListener = bookies -> firstResult.complete(bookies);
CompletableFuture<Versioned<Set<BookieSocketAddress>>> secondResult = new CompletableFuture<>();
RegistrationListener secondListener = bookies -> secondResult.complete(bookies);
List<CompletableFuture<Void>> watchFutures = Lists.newArrayListWithExpectedSize(2);
if (isWritable) {
watchFutures.add(zkRegistrationClient.watchWritableBookies(firstListener));
watchFutures.add(zkRegistrationClient.watchWritableBookies(secondListener));
} else {
watchFutures.add(zkRegistrationClient.watchReadOnlyBookies(firstListener));
watchFutures.add(zkRegistrationClient.watchReadOnlyBookies(secondListener));
}
// trigger zkCallbackExecutor to execute getChildren callback
zkCallbackController.advance(Duration.ofMillis(zkCallbackDelayMs));
result(collect(watchFutures));
assertEquals(firstResult.get().getVersion(), secondResult.get().getVersion());
assertSetEquals(firstResult.get().getValue(), secondResult.get().getValue());
}
use of org.apache.bookkeeper.discover.RegistrationClient.RegistrationListener in project bookkeeper by apache.
the class TestZkRegistrationClient method testWatchBookiesSuccess.
@SuppressWarnings("unchecked")
private void testWatchBookiesSuccess(boolean isWritable) throws Exception {
//
// 1. test watch bookies with a listener
//
LinkedBlockingQueue<Versioned<Set<BookieSocketAddress>>> updates = spy(new LinkedBlockingQueue<>());
RegistrationListener listener = bookies -> {
try {
updates.put(bookies);
} catch (InterruptedException e) {
log.warn("Interrupted on enqueue bookie updates", e);
}
};
Set<BookieSocketAddress> addresses = prepareNBookies(10);
List<String> children = Lists.newArrayList();
for (BookieSocketAddress address : addresses) {
children.add(address.toString());
}
Stat stat = mock(Stat.class);
when(stat.getCversion()).thenReturn(1234);
mockGetChildren(isWritable ? regPath : regReadonlyPath, true, Code.OK.intValue(), children, stat);
if (isWritable) {
result(zkRegistrationClient.watchWritableBookies(listener));
} else {
result(zkRegistrationClient.watchReadOnlyBookies(listener));
}
Versioned<Set<BookieSocketAddress>> update = updates.take();
verify(updates, times(1)).put(any(Versioned.class));
assertEquals(new LongVersion(1234), update.getVersion());
assertSetEquals(addresses, update.getValue());
verify(mockZk, times(1)).getChildren(anyString(), any(Watcher.class), any(Children2Callback.class), any());
//
// 2. test watch bookies with a second listener. the second listener returns cached bookies
// without calling `getChildren` again
//
// register another listener
LinkedBlockingQueue<Versioned<Set<BookieSocketAddress>>> secondUpdates = spy(new LinkedBlockingQueue<>());
RegistrationListener secondListener = bookies -> {
try {
secondUpdates.put(bookies);
} catch (InterruptedException e) {
log.warn("Interrupted on enqueue bookie updates", e);
}
};
if (isWritable) {
result(zkRegistrationClient.watchWritableBookies(secondListener));
} else {
result(zkRegistrationClient.watchReadOnlyBookies(secondListener));
}
Versioned<Set<BookieSocketAddress>> secondListenerUpdate = secondUpdates.take();
// first listener will not be notified with any update
verify(updates, times(1)).put(any(Versioned.class));
// second listener will receive same update as the first listener received before
verify(secondUpdates, times(1)).put(any(Versioned.class));
assertSame(update.getVersion(), secondListenerUpdate.getVersion());
assertSame(update.getValue(), secondListenerUpdate.getValue());
// the second listener will return the cached value without issuing another getChildren call
verify(mockZk, times(1)).getChildren(anyString(), any(Watcher.class), any(Children2Callback.class), any());
//
// 3. simulate session expire, it will trigger watcher to refetch bookies again.
// but since there is no updates on bookies, the registered listeners will not be notified.
//
notifyWatchedEvent(EventType.None, KeeperState.Expired, isWritable ? regPath : regReadonlyPath);
// if session expires, the watcher task will get into backoff state
controller.advance(Duration.ofMillis(ZK_CONNECT_BACKOFF_MS));
// the same updates returns, the getChildren calls increase to 2
// but since there is no updates, so no notification is sent.
verify(mockZk, times(2)).getChildren(anyString(), any(Watcher.class), any(Children2Callback.class), any());
assertNull(updates.poll());
// both listener and secondListener will not receive any old update
verify(updates, times(1)).put(any(Versioned.class));
verify(secondUpdates, times(1)).put(any(Versioned.class));
//
// 4. notify with new bookies. both listeners will be notified with new bookies.
//
Set<BookieSocketAddress> newAddresses = prepareNBookies(20);
List<String> newChildren = Lists.newArrayList();
for (BookieSocketAddress address : newAddresses) {
newChildren.add(address.toString());
}
Stat newStat = mock(Stat.class);
when(newStat.getCversion()).thenReturn(1235);
mockGetChildren(isWritable ? regPath : regReadonlyPath, true, Code.OK.intValue(), newChildren, newStat);
// trigger watcher
notifyWatchedEvent(EventType.NodeChildrenChanged, KeeperState.SyncConnected, isWritable ? regPath : regReadonlyPath);
update = updates.take();
assertEquals(new LongVersion(1235), update.getVersion());
assertSetEquals(newAddresses, update.getValue());
secondListenerUpdate = secondUpdates.take();
assertSame(update.getVersion(), secondListenerUpdate.getVersion());
assertSame(update.getValue(), secondListenerUpdate.getValue());
verify(mockZk, times(3)).getChildren(anyString(), any(Watcher.class), any(Children2Callback.class), any());
verify(updates, times(2)).put(any(Versioned.class));
verify(secondUpdates, times(2)).put(any(Versioned.class));
//
// 5. unwatch the second listener and notify with new bookies again. only first listener will
// be notified with new bookies.
//
newAddresses = prepareNBookies(25);
newChildren.clear();
newChildren = Lists.newArrayList();
for (BookieSocketAddress address : newAddresses) {
newChildren.add(address.toString());
}
newStat = mock(Stat.class);
when(newStat.getCversion()).thenReturn(1236);
mockGetChildren(isWritable ? regPath : regReadonlyPath, true, Code.OK.intValue(), newChildren, newStat);
if (isWritable) {
assertEquals(2, zkRegistrationClient.getWatchWritableBookiesTask().getNumListeners());
zkRegistrationClient.unwatchWritableBookies(secondListener);
assertEquals(1, zkRegistrationClient.getWatchWritableBookiesTask().getNumListeners());
} else {
assertEquals(2, zkRegistrationClient.getWatchReadOnlyBookiesTask().getNumListeners());
zkRegistrationClient.unwatchReadOnlyBookies(secondListener);
assertEquals(1, zkRegistrationClient.getWatchReadOnlyBookiesTask().getNumListeners());
}
// the watch task will not be closed since there is still a listener
verify(mockZk, times(0)).removeWatches(eq(isWritable ? regPath : regReadonlyPath), same(isWritable ? zkRegistrationClient.getWatchWritableBookiesTask() : zkRegistrationClient.getWatchReadOnlyBookiesTask()), eq(WatcherType.Children), eq(true), any(VoidCallback.class), any());
// trigger watcher
notifyWatchedEvent(EventType.NodeChildrenChanged, KeeperState.SyncConnected, isWritable ? regPath : regReadonlyPath);
update = updates.take();
assertEquals(new LongVersion(1236), update.getVersion());
assertSetEquals(newAddresses, update.getValue());
secondListenerUpdate = secondUpdates.poll();
assertNull(secondListenerUpdate);
verify(mockZk, times(4)).getChildren(anyString(), any(Watcher.class), any(Children2Callback.class), any());
verify(updates, times(3)).put(any(Versioned.class));
verify(secondUpdates, times(2)).put(any(Versioned.class));
//
// 6. unwatch the first listener. the watch task will be closed and zk watcher will be removed.
//
//
WatchTask expectedWatcher;
if (isWritable) {
expectedWatcher = zkRegistrationClient.getWatchWritableBookiesTask();
assertFalse(expectedWatcher.isClosed());
zkRegistrationClient.unwatchWritableBookies(listener);
assertNull(zkRegistrationClient.getWatchWritableBookiesTask());
} else {
expectedWatcher = zkRegistrationClient.getWatchReadOnlyBookiesTask();
assertFalse(expectedWatcher.isClosed());
zkRegistrationClient.unwatchReadOnlyBookies(listener);
assertNull(zkRegistrationClient.getWatchReadOnlyBookiesTask());
}
// the watch task will not be closed since there is still a listener
assertTrue(expectedWatcher.isClosed());
verify(mockZk, times(1)).removeWatches(eq(isWritable ? regPath : regReadonlyPath), same(expectedWatcher), eq(WatcherType.Children), eq(true), any(VoidCallback.class), any());
}
use of org.apache.bookkeeper.discover.RegistrationClient.RegistrationListener in project bookkeeper by apache.
the class BookKeeperTestClient method waitForBookieInSet.
/**
* Wait for bookie to appear in either the writable set of bookies,
* or the read only set of bookies. Also ensure that it doesn't exist
* in the other set before completing.
*/
private Future<?> waitForBookieInSet(BookieSocketAddress b, boolean writable) throws Exception {
log.info("Wait for {} to become {}", b, writable ? "writable" : "readonly");
CompletableFuture<Void> readOnlyFuture = new CompletableFuture<>();
CompletableFuture<Void> writableFuture = new CompletableFuture<>();
RegistrationListener readOnlyListener = (bookies) -> {
boolean contains = bookies.getValue().contains(b);
if ((!writable && contains) || (writable && !contains)) {
readOnlyFuture.complete(null);
}
};
RegistrationListener writableListener = (bookies) -> {
boolean contains = bookies.getValue().contains(b);
if ((writable && contains) || (!writable && !contains)) {
writableFuture.complete(null);
}
};
getMetadataClientDriver().getRegistrationClient().watchWritableBookies(writableListener);
getMetadataClientDriver().getRegistrationClient().watchReadOnlyBookies(readOnlyListener);
if (writable) {
return writableFuture.thenCompose(ignored -> getMetadataClientDriver().getRegistrationClient().getReadOnlyBookies()).thenCompose(readonlyBookies -> {
if (readonlyBookies.getValue().contains(b)) {
// if the bookie still shows up at readonly path, wait for it to disappear
return readOnlyFuture;
} else {
return FutureUtils.Void();
}
});
} else {
return readOnlyFuture.thenCompose(ignored -> getMetadataClientDriver().getRegistrationClient().getWritableBookies()).thenCompose(writableBookies -> {
if (writableBookies.getValue().contains(b)) {
// if the bookie still shows up at writable path, wait for it to disappear
return writableFuture;
} else {
return FutureUtils.Void();
}
});
}
}
use of org.apache.bookkeeper.discover.RegistrationClient.RegistrationListener in project bookkeeper by apache.
the class TestZkRegistrationClient method testWatchBookiesFailure.
private void testWatchBookiesFailure(boolean isWritable) throws Exception {
int zkCallbackDelayMs = 100;
mockGetChildren(isWritable ? regPath : regReadonlyPath, true, Code.NONODE.intValue(), null, null, zkCallbackDelayMs);
CompletableFuture<Versioned<Set<BookieSocketAddress>>> listenerResult = new CompletableFuture<>();
RegistrationListener listener = bookies -> listenerResult.complete(bookies);
CompletableFuture<Void> watchFuture;
WatchTask watchTask;
if (isWritable) {
watchFuture = zkRegistrationClient.watchWritableBookies(listener);
watchTask = zkRegistrationClient.getWatchWritableBookiesTask();
} else {
watchFuture = zkRegistrationClient.watchReadOnlyBookies(listener);
watchTask = zkRegistrationClient.getWatchReadOnlyBookiesTask();
}
assertNotNull(watchTask);
assertEquals(1, watchTask.getNumListeners());
// trigger zkCallbackExecutor to execute getChildren callback
zkCallbackController.advance(Duration.ofMillis(zkCallbackDelayMs));
try {
result(watchFuture);
fail("Should fail to watch writable bookies if reg path doesn't exist");
} catch (ZKException zke) {
// expected
}
assertEquals(0, watchTask.getNumListeners());
assertTrue(watchTask.isClosed());
if (isWritable) {
assertNull(zkRegistrationClient.getWatchWritableBookiesTask());
} else {
assertNull(zkRegistrationClient.getWatchReadOnlyBookiesTask());
}
}
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