How to use

zkStat

method

in

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

/**
 * Verify a path exists.
 *
 * @param path path of operation
 * @throws PathNotFoundException if the path is absent
 * @throws IOException
 */
public String zkPathMustExist(String path) throws IOException {
 zkStat(path);
 return path;
}

/**
 * Verify a path exists
 * @param path path of operation
 * @throws PathNotFoundException if the path is absent
 * @throws IOException
 */
public String zkPathMustExist(String path) throws IOException {
 zkStat(path);
 return path;
}

/**
 * Probe for a path existing
 * @param path path of operation
 * @return true if the path was visible from the ZK server
 * queried.
 * @throws IOException on any exception other than
 * {@link PathNotFoundException}
 */
public boolean zkPathExists(String path) throws IOException {
 checkServiceLive();
 try {
  // if zkStat(path) returns without throwing an exception, the return value
  // is guaranteed to be not null
  zkStat(path);
  return true;
 } catch (PathNotFoundException e) {
  return false;
 } catch (IOException e) {
  throw e;
 }
}

/**
 * Probe for a path existing.
 *
 * @param path path of operation
 * @return true if the path was visible from the ZK server
 * queried.
 * @throws IOException on any exception other than
 *                     {@link PathNotFoundException}
 */
public boolean zkPathExists(String path) throws IOException {
 checkServiceLive();
 try {
  // if zkStat(path) returns without throwing an exception, the return value
  // is guaranteed to be not null
  zkStat(path);
  return true;
 } catch (PathNotFoundException e) {
  return false;
 } catch (IOException e) {
  throw e;
 }
}