AboutHDFSdataFinishIntegrity guarantee, which of the following mechanisms isMistakeof?
A.
SectionPoint higher performance DataNodemore data will be stored
B.
The log mechanism is used to operate the metadata, and the metadata is stored on the active and standby NanoNodes.
C.
The snapshot mechanism implements the file systemas usualSee the snapshot mechanism to ensure that data can be recovered in time when misoperation occurs
D.
DataNode to NameNode periodic reportFailTask,NameNodeinitiateviceThis rebuild action to restore lostcopy
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