Examples with ZooKeeper org.apache.zookeeper_voltpatches.ZooKeeper used on opensource projects

Example 51 with ZooKeeper

use of org.apache.zookeeper_voltpatches.ZooKeeper in project voltdb by VoltDB.

the class TestZK method testLeaderElection.

@Test
public void testLeaderElection() throws Exception {
    ZooKeeper zk = getClient(0);
    ZooKeeper zk2 = getClient(1);
    ZooKeeper zk3 = getClient(2);
    zk.create("/election", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    LeaderElector elector1 = new LeaderElector(zk, "/election", "node", null, null);
    LeaderElector elector2 = new LeaderElector(zk2, "/election", "node", null, null);
    LeaderElector elector3 = new LeaderElector(zk3, "/election", "node", null, null);
    elector1.start(true);
    elector2.start(true);
    elector3.start(true);
    assertTrue(elector1.isLeader());
    assertFalse(elector2.isLeader());
    assertFalse(elector3.isLeader());
    elector1.shutdown();
    elector2.shutdown();
    elector3.shutdown();
    zk.close();
    zk2.close();
    zk3.close();
}

Example 52 with ZooKeeper

use of org.apache.zookeeper_voltpatches.ZooKeeper in project voltdb by VoltDB.

the class TestZK method testNullVsZeroLengthData.

@Test
public void testNullVsZeroLengthData() throws Exception {
    ZooKeeper zk = getClient(0);
    zk.create("/foo", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    zk.create("/bar", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    assertEquals(null, zk.getData("/bar", false, null));
    assertTrue(zk.getData("/foo", false, null).length == 0);
}

Example 53 with ZooKeeper

use of org.apache.zookeeper_voltpatches.ZooKeeper in project voltdb by VoltDB.

the class TestZK method testRecursivelyDelete.

@Test
public void testRecursivelyDelete() throws Exception {
    ZooKeeper zk = getClient(0);
    zk.create("/a", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    zk.create("/a/b", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    zk.create("/a/b/c", null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    ZKUtil.deleteRecursively(zk, "/a");
    assertNull(zk.exists("/a", false));
}

Example 54 with ZooKeeper

use of org.apache.zookeeper_voltpatches.ZooKeeper in project voltdb by VoltDB.

the class TestZK method testFailureKillsEphemeral.

@Test
public void testFailureKillsEphemeral() throws Exception {
    ZooKeeper zk = getClient(0);
    zk.create("/foo", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    assertEquals(zk.getData("/foo", false, null).length, 0);
    failSite(0);
    zk = getClient(1);
    try {
        zk.getData("/foo", false, null);
    } catch (NoNodeException e) {
        return;
    }
    fail();
}

Example 55 with ZooKeeper

use of org.apache.zookeeper_voltpatches.ZooKeeper in project voltdb by VoltDB.

the class TestZK method testLeaderFailoverHoles.

@Test
public void testLeaderFailoverHoles() throws Exception {
    // as above but put multiple failed nodes between the new and previous?
    ZooKeeper zk0 = getClient(0);
    ZooKeeper zk1 = getClient(1);
    ZooKeeper zk2 = getClient(2);
    ZooKeeper zk3 = getClient(3);
    ZooKeeper zk4 = getClient(4);
    ZooKeeper zk5 = getClient(5);
    ZooKeeper zk6 = getClient(6);
    ZooKeeper zk7 = getClient(7);
    zk0.create("/election", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    final Semaphore sem1 = new Semaphore(0);
    LeaderNoticeHandler r1 = new LeaderNoticeHandler() {

        @Override
        public void becomeLeader() {
            sem1.release();
        }

        @Override
        public void noticedTopologyChange(boolean added, boolean removed) {
        }
    };
    final Semaphore sem7 = new Semaphore(0);
    LeaderNoticeHandler r7 = new LeaderNoticeHandler() {

        @Override
        public void becomeLeader() {
            sem7.release();
        }

        @Override
        public void noticedTopologyChange(boolean added, boolean removed) {
        }
    };
    LeaderElector elector0 = new LeaderElector(zk0, "/election", "node", new byte[0], null);
    LeaderElector elector1 = new LeaderElector(zk1, "/election", "node", new byte[0], r1);
    LeaderElector elector2 = new LeaderElector(zk2, "/election", "node", new byte[0], null);
    LeaderElector elector3 = new LeaderElector(zk3, "/election", "node", new byte[0], null);
    LeaderElector elector4 = new LeaderElector(zk4, "/election", "node", new byte[0], null);
    LeaderElector elector5 = new LeaderElector(zk5, "/election", "node", new byte[0], null);
    LeaderElector elector6 = new LeaderElector(zk6, "/election", "node", new byte[0], null);
    LeaderElector elector7 = new LeaderElector(zk7, "/election", "node", new byte[0], r7);
    elector0.start(true);
    elector1.start(true);
    elector2.start(true);
    elector3.start(true);
    elector4.start(true);
    elector5.start(true);
    elector6.start(true);
    elector7.start(true);
    assertTrue(elector0.isLeader());
    assertFalse(elector1.isLeader());
    assertFalse(elector2.isLeader());
    assertFalse(elector3.isLeader());
    assertFalse(elector4.isLeader());
    assertFalse(elector5.isLeader());
    assertFalse(elector6.isLeader());
    assertFalse(elector7.isLeader());
    // 4 should become the leader
    elector6.shutdown();
    zk6.close();
    elector4.shutdown();
    zk4.close();
    elector2.shutdown();
    zk2.close();
    elector0.shutdown();
    zk0.close();
    assertTrue(sem1.tryAcquire(5, TimeUnit.SECONDS));
    assertTrue(elector1.isLeader());
    assertFalse(elector3.isLeader());
    assertFalse(elector5.isLeader());
    assertFalse(elector7.isLeader());
    elector5.shutdown();
    zk5.close();
    elector3.shutdown();
    zk3.close();
    elector1.shutdown();
    zk1.close();
    assertTrue(sem7.tryAcquire(5, TimeUnit.SECONDS));
    assertTrue(elector7.isLeader());
    // cleanup.
    elector7.shutdown();
    zk7.close();
}