Flink RockDB的ColumnFamily来自哪里？

结论：
ColumnFamily Name==ColumnFamilyDescirptor Name == StateDescriptor Name

解释：

 kuduErrorDescriptor = new ListStateDescriptor<>("test", TypeInformation.of(new TypeHint<Object>() {
                }));            
kuduErrorDescriptor.enableTimeToLive(ttlConfig);
listState = getRuntimeContext().getListState(kuduErrorDescriptor);

用过 Flink KeyedState的小伙伴，相信很熟悉上面的代码。
代码中的"test"就是StateDescriptor Name。但是ColumnFamily Name==ColumnFamilyDescirptor Name == StateDescriptor Name为什么会成立呢？
我们以ListState为例：
getRuntimeContext().getListState(kuduErrorDescriptor);一路跟代码我们可以看到 RocksDBKeyedStateBackend 中 tryRegisterKvStateInformation方法

......
//第一次获取state
//将stateDesc.getName()赋值给newMetaInfo name
newMetaInfo = new RegisteredKeyValueStateBackendMetaInfo<>(
                stateDesc.getType(),
                stateDesc.getName(),
                namespaceSerializer,
                stateSerializer,
                StateSnapshotTransformFactory.noTransform());
newRocksStateInfo = RocksDBOperationUtils.createStateInfo(
                newMetaInfo, db, columnFamilyOptionsFactory, ttlCompactFiltersManager);
......

追踪createStateInfo

//将metaInfoBase name赋值给 columnFamilyDescriptor name 
ColumnFamilyDescriptor columnFamilyDescriptor = createColumnFamilyDescriptor(
            metaInfoBase, columnFamilyOptionsFactory, ttlCompactFiltersManager);

return new RocksDBKeyedStateBackend.RocksDbKvStateInfo(createColumnFamily(columnFamilyDescriptor, db), metaInfoBase);

追踪createColumnFamily到 RocksDB 的createColumnFamily

public ColumnFamilyHandle createColumnFamily(
      final ColumnFamilyDescriptor columnFamilyDescriptor)
      throws RocksDBException {
    return new ColumnFamilyHandle(this, createColumnFamily(nativeHandle_,
//传入columnFamilyDescriptor name , 
        columnFamilyDescriptor.columnFamilyName(),
       columnFamilyDescriptor.columnFamilyOptions().nativeHandle_));
  }

继续发现其调用本地方法

//利用columnFamilyDescriptor name 创建 columnFamily
  private native long createColumnFamily(final long handle,
      final byte[] columnFamilyName, final long columnFamilyOptions)
      throws RocksDBException;

补充：
rockdb families之间可以共享 write-ahead log 不共享 memtables 和 table files