How to use

zkPathExists

method

in

org.apache.hadoop.registry.client.impl.zk.CuratorService

 public void verifyNotExists(String path) throws IOException {
  if (curatorService.zkPathExists(path)) {
   fail("Path should not exist: " + path);
  }
 }
}

 public void verifyNotExists(String path) throws IOException {
  if (curatorService.zkPathExists(path)) {
   fail("Path should not exist: " + path);
  }
 }
}

/**
 * Create or update an entry.
 *
 * @param path      path
 * @param data      data
 * @param acl       ACL for path -used when creating a new entry
 * @param overwrite enable overwrite
 * @return true if the entry was created, false if it was simply updated.
 * @throws IOException
 */
public boolean zkSet(String path,
  CreateMode mode,
  byte[] data,
  List<ACL> acl, boolean overwrite) throws IOException {
 Preconditions.checkArgument(data != null, "null data");
 checkServiceLive();
 if (!zkPathExists(path)) {
  zkCreate(path, mode, data, acl);
  return true;
 } else {
  if (overwrite) {
   zkUpdate(path, data);
   return false;
  } else {
   throw new FileAlreadyExistsException(path);
  }
 }
}

/**
 * Create or update an entry
 * @param path path
 * @param data data
 * @param acl ACL for path -used when creating a new entry
 * @param overwrite enable overwrite
 * @throws IOException
 * @return true if the entry was created, false if it was simply updated.
 */
public boolean zkSet(String path,
  CreateMode mode,
  byte[] data,
  List<ACL> acl, boolean overwrite) throws IOException {
 Preconditions.checkArgument(data != null, "null data");
 checkServiceLive();
 if (!zkPathExists(path)) {
  zkCreate(path, mode, data, acl);
  return true;
 } else {
  if (overwrite) {
   zkUpdate(path, data);
   return false;
  } else {
   throw new FileAlreadyExistsException(path);
  }
 }
}

@Test
public void testExistsMissing() throws Throwable {
 assertFalse(curatorService.zkPathExists(MISSING));
}

@Test
public void testExists() throws Throwable {
 assertTrue(curatorService.zkPathExists("/"));
}

@Test
public void testExists() throws Throwable {
 assertTrue(curatorService.zkPathExists("/"));
}

@Test
public void testExistsMissing() throws Throwable {
 assertFalse(curatorService.zkPathExists(MISSING));
}

  .currentUser(), YarnServiceConstants.APP_TYPE, exampleApp.getName());
Assert.assertTrue("Registry ZK service path doesn't exist",
  getCuratorService().zkPathExists(serviceZKPath));
  getCuratorService().zkPathExists(serviceZKPath));