NameNode存储DataNode的元数据，NameNode主要是用于维护DataNode信息。它存储在hadoop文件夹下data/dfs/name/current/，其中以fsimage开头的文件主要存储目录、文件名称及其依赖关系，以edits开头的文件主要存储尚未来得及合并的日志记录
ls hadoop/data/dfs/name/current #----------------------------------------------------------------------------- edits_0000000000000000001-0000000000000000002 fsimage_0000000000000000005.md5 edits_0000000000000000003-0000000000000000003 fsimage_0000000000000000014 edits_0000000000000000004-0000000000000000005 fsimage_0000000000000000014.md5 edits_0000000000000000006-0000000000000000014 seen_txid edits_inprogress_0000000000000000015 VERSION fsimage_0000000000000000005 #-----------------------------------------------------------------------------2、NameNode节点数据查看
#查看目录、文件名称及其依赖关系，将信息转化为xml格式 hdfs oiv -i hadoop_home/data/dfs/name/current/fsimage* -o save_path/filename -p XMl #例程： hdfs oiv -i /opt/software/hadoop313/data/dfs/name/current/fsimage_0000000000000000258 -o ~/fsimage_0000000000000000258 -p XML #查看文件日志记录 hdfs oev -i hadoop_home/data/dfs/name/current/edits* -o save_path/filename -p XMl #例程： hdfs oev -i /opt/software/hadoop313/data/dfs/name/current/edits_inprogress_0000000000000000079 -o ~/edits_inprogress_0000000000000000079 -p XML3、fsimage文件
4、edits文件-64 1 ba631c436b806728f8ec2f54ab1e289526c90579 1540392763 1000 1006 0 1073741830 44 1 RS-6-3-1024k 1048576 DISABLED rs 6 3 2 RS-3-2-1024k 1048576 DISABLED rs 3 2 3 RS-LEGACY-6-3-1024k 1048576 DISABLED rs-legacy 6 3 4 XOR-2-1-1024k 1048576 DISABLED xor 2 1 5 RS-10-4-1024k 1048576 DISABLED rs 10 4 16396 12 16385 DIRECTORY 1640743069439 root:supergroup:0755 9223372036854775807 -1 16386 DIRECTORY tmp 1640738001903 root:supergroup:0770 -1 -1 16387 DIRECTORY hadoop-yarn 1640738001903 root:supergroup:0770 -1 -1 16388 DIRECTORY staging 1640738001903 root:supergroup:0770 -1 -1 16389 DIRECTORY history 1640738001940 root:supergroup:0770 -1 -1 16390 DIRECTORY done 1640738001903 root:supergroup:0770 -1 -1 16391 DIRECTORY done_intermediate 1640738001940 root:supergroup:1777 -1 -1 16392 DIRECTORY test 1640743069439 root:supergroup:0755 -1 -1 16393 DIRECTORY kb16 1640743124723 root:supergroup:0755 -1 -1 16394 DIRECTORY hadoop 1640743625760 root:supergroup:0755 -1 -1 16395 DIRECTORY hive 1640743124723 root:supergroup:0755 -1 -1 16396 FILE ratings.csv 1 1640743625739 1640743618694 134217728 root:supergroup:0644 1073741825 1001 134217728 1073741826 1002 134217728 1073741827 1003 134217728 1073741828 1004 134217728 1073741829 1005 134217728 1073741830 1006 7172347 0 0 0 16385 16392 16386 16386 16387 16387 16388 16388 16389 16389 16390 16391 16392 16393 16393 16394 16395 16394 16396 0 0 0 0 1 0 0
-64 OP_START_LOG_SEGMENT 45
