class_docstr: A State Backend that stores its state in an embedded ``RocksDB`` instance. This state backend
  can store very large state that exceeds memory and spills to local disk.
  
  All key/value state (including windows) is stored in the key/value index of RocksDB.
  For persistence against loss of machines, please configure a CheckpointStorage instance
  for the Job.
  
  The behavior of the RocksDB instances can be parametrized by setting RocksDB Options
  using the methods :func:`set_predefined_options` and :func:`set_options`.
class_docstr_tok: ["A","State","Backend","that","stores","its","state","in","an","embedded","``","RocksDB","``","instance",".","This","state","backend","can","store","very","large","state","that","exceeds","memory","and","spills","to","local","disk",".","All","key\/value","state","(","including","windows",")","is","stored","in","the","key\/value","index","of","RocksDB",".","For","persistence","against","loss","of","machines",",","please","configure","a","CheckpointStorage","instance","for","the","Job",".","The","behavior","of","the","RocksDB","instances","can","be","parametrized","by","setting","RocksDB","Options","using","the","methods",":","func",":","`","set_predefined_options","`","and",":","func",":","`","set_options","`","."]
code: def __str__(self):
      return self._j_state_backend.toString()
  
imports: from abc import ABCMeta
  from enum import Enum
  from py4j.java_gateway import get_java_class
  from typing import List, Optional
  from pyflink.java_gateway import get_gateway
  from pyflink.util.java_utils import load_java_class
label_desc: Use image node_id 11 for calling the EmbeddedRocksDBStateBackend obj's underlying member method code with example usage: obj.__str__() and returns: self