@Override
  public boolean abortProcedure(final long procId, final boolean mayInterruptIfRunning)
    throws IOException {
    if (cpHost != null) {
      cpHost.preAbortProcedure(this.procedureExecutor, procId);
    }

    final boolean result = this.procedureExecutor.abort(procId, mayInterruptIfRunning);

    if (cpHost != null) {
      cpHost.postAbortProcedure();
    }

    return result;
  }
List namespace names
@return All namespace names
hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java