Method disconnectZK

src/HBaseClient.java:4275–4299

Disconnects from ZooKeeper. This method is blocking. Unfortunately, ZooKeeper doesn't offer an asynchronous API to close a session at this time. It waits until the server responds to the closeSession RPC.

()

     * It waits until the server responds to the {@code closeSession} RPC.
     */
    public void disconnectZK() {
      synchronized (this) {
        if (zk == null) {
          return;
        }
        try {
          // I'm not sure but I think both the client and the server race to
          // close the socket, which often causes the DEBUG spam:
          //   java.net.SocketException: Socket is not connected
          // When the client attempts to close its socket after its OS and
          // JVM are done processing the TCP FIN and it's already closed.
          LOG.debug("Ignore any DEBUG exception from ZooKeeper");
          final long start = System.nanoTime();
          zk.close();
          LOG.debug("ZooKeeper#close completed in {}ns",
                    System.nanoTime() - start);
        } catch (InterruptedException e) {
          // The signature of the method pretends that it can throw an
          // InterruptedException, but this is a lie, the code of that
          // method will never throw this type of exception.
          LOG.error("Should never happen", e);
        }
        zk = null;
      }
    }

    /** Schedule a timer to retry {@link #getRootRegion} after some time.  */
    private void retryGetRootRegionLater() {