Does the name node block the block space continuously? According to my understanding, please explain namenode store nominated space image and log store permanently please explain?
Information about the location of the block is not maintained by the NN, NN will send it to the With the help of Block Reports makes dynamic NN Metadata contains the entire file system namespace, which includes mapping of blocks for files and file system properties. All this information is permanently stored in the fsimage file in your hdfs-site.xml file in the place specified by dfs.name.dir You can find this file.
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