forN(N>1) copies of stored documents,HDFSThe client initiates a read file request. If the read replica node fails, the If the connection fails, it will not go to other replica nodes for reading.

HDFSRuntime,NameNodewill load all the metadata of the file system from disk into memory, so the file system can The total number of files stored is limited byNameNodememory capacity.

forSpark Streamingapplication, in aJVM, there can only be one at a timeStreamingContextactive condition.

Which of the following application scenarios mainly generate unstructured data?
(multiple choice)

HDFSThere is a file in the cluster and directorytext.txt, which of the following commands can find theDatNodenode information?