question: spy on calls from the dn to the nn . concode_field_sep short DN_COUNT concode_elem_sep NameNode singletonNn concode_elem_sep Configuration conf concode_elem_sep long DUMMY_BLOCK_ID concode_elem_sep DistributedFileSystem fs concode_elem_sep Log LOG concode_elem_sep BPServiceActor actor concode_elem_sep long DUMMY_BLOCK_GENSTAMP concode_elem_sep long DUMMY_BLOCK_LENGTH concode_elem_sep MiniDFSCluster cluster concode_elem_sep DataNode singletonDn concode_elem_sep String storageUuid concode_elem_sep BPOfferService bpos concode_field_sep void testReportBlockReceived concode_elem_sep void testReportBlockDeleted concode_elem_sep Block getDummyBlock concode_elem_sep void injectBlockDeleted concode_elem_sep void injectBlockReceived concode_elem_sep void testReplaceReceivedBlock concode_elem_sep void startCluster
target: DatanodeProtocolClientSideTranslatorPB function ( ) { return DataNodeTestUtils . spyOnBposToNN ( singletonDn , singletonNn ) ; }