Advantages and disadvantages of distributed file storage system

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Distributed file storage system

Distributed ： stay hdfs Is composed of multiple servers , Each server plays a different role

HDFS It is applicable to write once and read many times , File modification is not supported

advantage

1 High fault tolerance There's no problem with one machine going down , It will not result in the overall loss of data . Some lost data will be quickly pulled from other nodes and replied . 2 A file that stores large amounts of data Order of magnitude GB TB PB All support Piece size Suitable for storing millions of data 3 The hardware price is low Cheap physical machines can be used

shortcoming

1 Not suitable for storing small files This interview may also be asked , Please understand cause namenode There is a lot of metadata stored in Too many files will result in long addressing time , Combining metadata is too slow 2 It is suitable for systems with high real-time access requirements 3 Not suitable for modifying files It is suitable for making additional documents 4 Suitable for concurrent operation

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