详情请参见DatanodeUtil.java中的函数idToBlockDir(File root, long blockId)。 如果block文件没有放在正确的目录下,则DataNode会出现“expected block file path”日志。 // g++ -g -o block2dir block2dir.cpp #include #include int main(int argc, char* argv[]) { if (argc != 2) { fprintf(stderr, "usage: block2dir block_id, example: block2dir 1075840138\n"); exit(1); } const long block_id = atol(argv[1]); const int d1 = (int) ((block_id >> 16) & 0x1F); const int d2 = (int) ((block_id >> 8) & 0x1F); fprintf(stderr, "subdir%d/subdir%d\n", d1, d2); return 0; } 运行示例: $ ./block2dir 1075840138 subdir0/subdir4 /** * @return the meta name given the block name and generation stamp. */ public static String getMetaName(String blockName, long generationStamp) { return blockName + "_" + generationStamp + Block.METADATA_EXTENSION; }