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;
}
阅读(3867) | 评论(0) | 转发(0) |
