HDFS fsck命令输出

我在输出中得到了这个,所以我只想知道什么是BP,Blk？你能解释一下这个输出中每个东西的含义吗？我知道

 BP-929597290-192.0.0.2-1439573305237:blk_1074084574_344316 len=2 repl=3 [DatanodeInfoWithStorage[192.0.0.9:1000,DS-730a75d3-046c-4254-990a-4eee9520424f,DISK], DatanodeInfoWithStorage[192.0.0.1:1000,DS-fc6ee5c7-e76b-4faa-b663-58a60240de4c,DISK], DatanodeInfoWithStorage[192.0.0.3:1000,DS-8ab81b26-309e-42d6-ae14-26eb88387cad,DISK]]

我猜192.0.0.9:1000这是第一次复制数据的IP

BP-929597290-192.0.0.2-1439573305237

这是Block Pool ID.块池是属于单个名称空间的一组块.为简单起见,您可以说名称节点管理的所有块都在同一个块池下.

Block Pool形成如下:

String bpid = "BP-" + rand + "-"+ ip + "-" + Time.now();        

Where: 
rand = Some random number
ip = IP address of the Name Node
Time.now() - Current system time

在这里阅读Block Pools:https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/Federation.html

blk_1074084574_344316:

块的块号.HDFS中的每个块都有一个唯一的标识符.

块ID形成为:

blk__ 

Where: 
blockid = ID of the block
genstamp = an incrementing integer that records the version of a particular block

在这里阅读关于代邮票:http://blog.cloudera.com/blog/2009/07/file-appends-in-hdfs/

LEN = 2

块长度:块中的字节数

REPL = 3

这个街区有3个副本

DatanodeInfoWithStorage [192.0.0.9:1000,DS-730a75d3-046c-4254-990a-4eee9520424f,DISK

哪里:

192.0.0.9 => IP address of the Data Node holding this block
1000 => Data streaming port
DS-730a75d3-046c-4254-990a-4eee9520424f => Storage ID. It is an internal ID of the Data Node. It is assigned, when the Data Node registers with Name Node
DISK => storageType. It is DISK here. Storage type can be: RAM_DISK, SSD, DISK and ARCHIVE

第5点的描述适用于剩余的2个块:

DatanodeInfoWithStorage[192.0.0.1:1000,DS-fc6ee5c7-e76b-4faa-b663-58a60240de4c,DISK], 
DatanodeInfoWithStorage[192.0.0.3:1000,DS-8ab81b26-309e-42d6-ae14-26eb88387cad,DISK]]