Example usage for org.apache.zookeeper WatchedEvent getPath

Introduction

In this page you can find the example usage for org.apache.zookeeper WatchedEvent getPath.

Prototype

public String getPath() 

Source Link

Usage

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatch() throws InterruptedException {
    final CountDownLatch latch = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.ChildrenCallback childrenCallback = new AsyncCallback.ChildrenCallback() {
        @Override//from   w ww  . j  av a  2  s.com
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            Assert.assertEquals(children.size(), 11);
            latch.countDown();
        }
    };
    Watcher childrenWatch = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, childrenCallback, null);
        }
    };
    AsyncCallback.ChildrenCallback childrenCallback2 = new AsyncCallback.ChildrenCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            KeeperException.Code result = KeeperException.Code.get(rc);
            Assert.assertEquals(result, KeeperException.Code.OK);
            latch2.countDown();
        }
    };
    // symlink: /foo/$link -> /foo/bar
    _zkClient.getZooKeeper().getChildren("/foo/$link", childrenWatch, childrenCallback2, null);
    latch2.await(30, TimeUnit.SECONDS);
    _zkClient.ensurePersistentNodeExists("/foo/bar/newNode", new FutureCallback<None>());
    latch.await(30, TimeUnit.SECONDS);
    _zkClient.removeNodeUnsafe("/foo/bar/newNode", new FutureCallback<None>());
}

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From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatcher2() throws ExecutionException, InterruptedException {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    final AsyncCallback.ChildrenCallback callback2 = new AsyncCallback.ChildrenCallback() {
        @Override/* ww w  .ja va 2  s .  c o  m*/
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            Assert.assertEquals(path, "/foo/$link");
            Assert.assertEquals(children.size(), 5);
            latch2.countDown();
        }
    };
    Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, callback2, null);
        }
    };
    AsyncCallback.ChildrenCallback callback = new AsyncCallback.ChildrenCallback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children) {
            latch1.countDown();
        }
    };
    // set watcher to /foo/$link
    _zkClient.getZooKeeper().getChildren("/foo/$link", watcher, callback, null);
    latch1.await(30, TimeUnit.SECONDS);
    // update symlink
    _zkClient.setSymlinkData("/foo/$link", "/bar/foo", new FutureCallback<None>());
    latch2.await(30, TimeUnit.SECONDS);
    FutureCallback<None> fcb = new FutureCallback<None>();
    // restore symlink
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", fcb);
    fcb.get();
}

---

From source file:com.linkedin.d2.discovery.stores.zk.SymlinkAwareZooKeeperTest.java

License:Apache License

@Test
public void testSymlinkWithChildrenWatcher3() throws ExecutionException, InterruptedException, KeeperException {
    final CountDownLatch latch1 = new CountDownLatch(1);
    final CountDownLatch latch2 = new CountDownLatch(1);
    Stat expectedStat1 = _zkClient.getZooKeeper().exists("/foo/bar", false);
    Stat expectedStat2 = _zkClient.getZooKeeper().exists("/bar/foo", false);

    final AsyncCallback.Children2Callback callback2 = new AsyncCallback.Children2Callback() {
        @Override//from  ww  w. java 2s.  c  om
        public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
            Assert.assertEquals(path, "/foo/$link");
            Assert.assertEquals(children.size(), 5);
            Assert.assertEquals(stat, expectedStat2);
            latch2.countDown();
        }
    };
    Watcher watcher = new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            Assert.assertEquals(event.getType(), Event.EventType.NodeChildrenChanged);
            _zkClient.getZooKeeper().getChildren(event.getPath(), null, callback2, null);
        }
    };
    AsyncCallback.Children2Callback callback = new AsyncCallback.Children2Callback() {
        @Override
        public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
            Assert.assertEquals(stat, expectedStat1);
            latch1.countDown();
        }
    };
    // set watcher to /foo/$link
    _zkClient.getZooKeeper().getChildren("/foo/$link", watcher, callback, null);
    latch1.await(30, TimeUnit.SECONDS);
    // update symlink
    _zkClient.setSymlinkData("/foo/$link", "/bar/foo", new FutureCallback<None>());
    latch2.await(30, TimeUnit.SECONDS);
    FutureCallback<None> fcb = new FutureCallback<None>();
    // restore symlink
    _zkClient.setSymlinkData("/foo/$link", "/foo/bar", fcb);
    fcb.get();
}

---

From source file:com.metamx.druid.master.LoadQueuePeon.java

License:Open Source License

private void doNext() {
    synchronized (lock) {
        if (currentlyLoading == null) {
            if (!segmentsToDrop.isEmpty()) {
                currentlyLoading = segmentsToDrop.first();
                log.info("Server[%s] dropping [%s]", basePath, currentlyLoading);
            } else if (!segmentsToLoad.isEmpty()) {
                currentlyLoading = segmentsToLoad.first();
                log.info("Server[%s] loading [%s]", basePath, currentlyLoading);
            } else {
                return;
            }/*  w  ww. ja  v  a  2  s . c  o m*/

            zkWritingExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    synchronized (lock) {
                        try {
                            if (currentlyLoading == null) {
                                log.makeAlert("Crazy race condition! server[%s]", basePath).emit();
                                actionCompleted();
                                doNext();
                                return;
                            }
                            log.info("Server[%s] adding segment[%s]", basePath,
                                    currentlyLoading.getSegmentIdentifier());
                            final String path = ZKPaths.makePath(basePath,
                                    currentlyLoading.getSegmentIdentifier());
                            final byte[] payload = jsonMapper
                                    .writeValueAsBytes(currentlyLoading.getChangeRequest());
                            curator.create().withMode(CreateMode.EPHEMERAL).forPath(path, payload);

                            zkWritingExecutor.schedule(new Runnable() {
                                @Override
                                public void run() {
                                    try {
                                        if (curator.checkExists().forPath(path) != null) {
                                            failAssign(new ISE("%s was never removed! Failing this assign!",
                                                    path));
                                        }
                                    } catch (Exception e) {
                                        failAssign(e);
                                    }
                                }
                            }, config.getLoadTimeoutDelay().getMillis(), TimeUnit.MILLISECONDS);

                            final Stat stat = curator.checkExists().usingWatcher(new CuratorWatcher() {
                                @Override
                                public void process(WatchedEvent watchedEvent) throws Exception {
                                    switch (watchedEvent.getType()) {
                                    case NodeDeleted:
                                        entryRemoved(watchedEvent.getPath());
                                    }
                                }
                            }).forPath(path);

                            if (stat == null) {
                                final byte[] noopPayload = jsonMapper
                                        .writeValueAsBytes(new SegmentChangeRequestNoop());

                                // Create a node and then delete it to remove the registered watcher.  This is a work-around for
                                // a zookeeper race condition.  Specifically, when you set a watcher, it fires on the next event
                                // that happens for that node.  If no events happen, the watcher stays registered foreverz.
                                // Couple that with the fact that you cannot set a watcher when you create a node, but what we
                                // want is to create a node and then watch for it to get deleted.  The solution is that you *can*
                                // set a watcher when you check to see if it exists so, we first create the node and then set a
                                // watcher on its existence.  However, if already does not exist by the time the existence check
                                // returns, then the watcher that was set will never fire (nobody will ever create the node
                                // again) and thus lead to a slow, but real, memory leak.  So, we create another node to cause
                                // that watcher to fire and delete it right away.
                                //
                                // We do not create the existence watcher first, because then it will fire when we create the
                                // node and we'll have the same race when trying to refresh that watcher.
                                curator.create().withMode(CreateMode.EPHEMERAL).forPath(path, noopPayload);

                                entryRemoved(path);
                            }
                        } catch (Exception e) {
                            failAssign(e);
                        }
                    }
                }
            });
        } else {
            log.info("Server[%s] skipping doNext() because something is currently loading[%s].", basePath,
                    currentlyLoading);
        }
    }
}

---

From source file:com.navercorp.nbasearc.confmaster.server.leaderelection.LeaderElectionSupport.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (event.getType().equals(Watcher.Event.EventType.NodeDeleted)
            && !event.getPath().equals(leaderOffer.getNodePath()) && state != State.STOP) {
        logger.debug("Node {} deleted. Need to run through the election process.", event.getPath());
        try {/* ww w.j a  v a2  s  . c  om*/
            determineElectionStatus();
        } catch (KeeperException e) {
            becomeFailed(e);
        } catch (InterruptedException e) {
            becomeFailed(e);
        }
    }
}

---

From source file:com.navercorp.nbasearc.confmaster.server.watcher.WatchEventHandler.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    Level logLevel = INFO;//from w w  w.j a v a2  s.  c om

    try {
        if (event.getType() == Event.EventType.NodeDeleted) {
            return;
        }

        lock(event.getPath());
        work(event);
    } catch (Exception e) {
        Logger.error("Handle watch event fail. {} {}", event.getPath(), event, e);

        logLevel = DEBUG;
    } finally {
        unlock();
    }

    Logger.flush(logLevel);
}

---

From source file:com.navercorp.nbasearc.confmaster.server.watcher.WatchEventHandlerCluster.java

License:Apache License

@Override
public void onChangedEvent(WatchedEvent event) throws MgmtZooKeeperException {
    if (LeaderState.isLeader()) {
        return;//from ww  w. j  a v  a 2 s  . co  m
    } else {
        registerBoth(event.getPath());

        Cluster cluster = clusterImo.getByPath(event.getPath());
        if (null == cluster) {
            // this znode already removed.
            return;
        }

        zookeeper.reflectZkIntoMemory(cluster);
    }
}

---

From source file:com.navercorp.nbasearc.confmaster.server.watcher.WatchEventHandlerClusterRoot.java

License:Apache License

@Override
public void onChildEvent(WatchedEvent event) throws MgmtZooKeeperException, NoNodeException {
    if (LeaderState.isLeader()) {
        return;/* www. j  a  va2s.  c o  m*/
    } else {
        registerBoth(event.getPath());

        // Delete
        List<String> deleted = getDeletedChild(event.getPath(), clusterImo.getAll());
        for (String clusterName : deleted) {
            clusterImo.delete(PathUtil.clusterPath(clusterName));
        }

        // Created
        List<String> created = getCreatedChild(event.getPath(), clusterImo.getAll());
        for (String clusterName : created) {
            // TDOO : eliminate null
            clusterImo.load(clusterName);
        }
    }
}

---

From source file:com.navercorp.nbasearc.confmaster.server.watcher.WatchEventHandlerFd.java

License:Apache License

@Override
public void onChildEvent(WatchedEvent event) throws MgmtZooKeeperException {
    registerBoth(event.getPath());

    workflowExecutor.perform(UPDATE_HEARTBEAT_CHECKER);
}

---

From source file:com.navercorp.nbasearc.confmaster.server.watcher.WatchEventHandlerGw.java

License:Apache License

@Override
public void onChildEvent(WatchedEvent event) throws MgmtZooKeeperException {
    registerBoth(event.getPath());

    Gateway gw = gwImo.getByPath(event.getPath());

    if (gw.getData().getHB().equals(Constant.HB_MONITOR_YES)) {
        gw.getHbc().urgent();//from ww  w  .  j a va 2 s . c om
    }

    workflowExecutor.perform(FAILOVER_COMMON, gw);
}

---

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