3种形式的元数据，fsimage是在磁盘上，meta.data是在内存上，

我们继续，前面呢，断点是打在这一行代码处，

FileSystem fs = FileSystem.get(conf);

weekend110的hdfs下载数据源码跟踪铺垫  +  hdfs下载数据源码分析-getFileSystem

现在，开始weekend110的hdfs源码跟踪之打开输入流

1、  清掉之前，所有的断点，

dfs是fs的成员，

此刻，断点过不去了，为什么？因为，这需要在服务器上运行。

由此可见,newInfo里面就是block信息。

LocatedBlocks{

  fileLength=143588167

  underConstruction=false

  blocks=[LocatedBlock{BP-168439838-192.168.80.110-1468829197712:blk_1073741856_1032; getBlockSize()=134217728; corrupt=false; offset=0; locs=[192.168.80.110:50010]}, LocatedBlock{BP-168439838-192.168.80.110-1468829197712:blk_1073741857_1033; getBlockSize()=9370439; corrupt=false; offset=134217728; locs=[192.168.80.110:50010]}]

  lastLocatedBlock=LocatedBlock{BP-168439838-192.168.80.110-1468829197712:blk_1073741857_1033; getBlockSize()=9370439; corrupt=false; offset=134217728; locs=[192.168.80.110:50010]}

  isLastBlockComplete=true}

BP-168439838-192.168.80.110-1468829197712

这是机器集群的信息，

[hadoop@weekend110 app]$ cd hadoop-2.4.1/

[hadoop@weekend110 hadoop-2.4.1]$ ll

total 60

drwxr-xr-x. 2 hadoop hadoop  4096 Jul 18 15:48 bin

drwxrwxr-x. 4 hadoop hadoop  4096 Jul 18 20:37 data

drwxr-xr-x. 3 hadoop hadoop  4096 Jun 21  2014 etc

drwxr-xr-x. 2 hadoop hadoop  4096 Jun 21  2014 include

drwxr-xr-x. 3 hadoop hadoop  4096 Jun 21  2014 lib

drwxr-xr-x. 2 hadoop hadoop  4096 Jun 21  2014 libexec

-rw-r--r--. 1 hadoop hadoop 15458 Jun 21  2014 LICENSE.txt

drwxrwxr-x. 3 hadoop hadoop  4096 Jul 22 11:20 logs

-rw-r--r--. 1 hadoop hadoop   101 Jun 21  2014 NOTICE.txt

-rw-r--r--. 1 hadoop hadoop  1366 Jun 21  2014 README.txt

drwxr-xr-x. 2 hadoop hadoop  4096 Jun 21  2014 sbin

drwxr-xr-x. 4 hadoop hadoop  4096 Jun 21  2014 share

[hadoop@weekend110 hadoop-2.4.1]$ clear

[hadoop@weekend110 hadoop-2.4.1]$ cd data/

[hadoop@weekend110 data]$ ll

total 8

drwxrwxr-x.  5 hadoop hadoop 4096 Jul 18 16:15 dfs

drwxr-xr-x. 12 hadoop hadoop 4096 Jul 22 11:20 nm-local-dir

[hadoop@weekend110 data]$ cd dfs/

[hadoop@weekend110 dfs]$ ll

total 12

drwx------. 3 hadoop hadoop 4096 Jul 18 23:07 data

drwxrwxr-x. 3 hadoop hadoop 4096 Jul 18 23:06 name

drwxrwxr-x. 3 hadoop hadoop 4096 Jul 18 23:07 namesecondary

[hadoop@weekend110 dfs]$ cd data/

[hadoop@weekend110 data]$ ll

total 8

drwxrwxr-x. 3 hadoop hadoop 4096 Jul 18 16:14 current

-rw-rw-r--. 1 hadoop hadoop   16 Jul 22 11:19 in_use.lock

[hadoop@weekend110 data]$ cd current/

[hadoop@weekend110 current]$ ll

total 8

drwx------. 4 hadoop hadoop 4096 Jul 22 11:20 BP-168439838-192.168.80.110-1468829197712

-rw-rw-r--. 1 hadoop hadoop  229 Jul 22 11:19 VERSION

[hadoop@weekend110 current]$ cd BP-168439838-192.168.80.110-1468829197712/

[hadoop@weekend110 BP-168439838-192.168.80.110-1468829197712]$ ll

total 12

drwxrwxr-x. 4 hadoop hadoop 4096 Jul 18 23:02 current

-rw-rw-r--. 1 hadoop hadoop    0 Jul 22 11:20 dncp_block_verification.log.curr

-rw-rw-r--. 1 hadoop hadoop  348 Jul 22 11:20 dncp_block_verification.log.prev

drwxrwxr-x. 2 hadoop hadoop 4096 Jul 22 11:19 tmp

[hadoop@weekend110 BP-168439838-192.168.80.110-1468829197712]$ cd current/

[hadoop@weekend110 current]$ ll

total 16

-rw-rw-r--. 1 hadoop hadoop   23 Jul 18 23:02 dfsUsed

drwxrwxr-x. 2 hadoop hadoop 4096 Jul 20 15:20 finalized

drwxrwxr-x. 2 hadoop hadoop 4096 Jul 20 15:20 rbw

-rw-rw-r--. 1 hadoop hadoop  131 Jul 22 11:19 VERSION

[hadoop@weekend110 current]$ cd finalized/

[hadoop@weekend110 finalized]$ ll

total 141340

-rw-rw-r--. 1 hadoop hadoop 134217728 Jul 19 09:59 blk_1073741856

-rw-rw-r--. 1 hadoop hadoop   1048583 Jul 19 09:59 blk_1073741856_1032.meta

-rw-rw-r--. 1 hadoop hadoop   9370439 Jul 19 09:59 blk_1073741857

-rw-rw-r--. 1 hadoop hadoop     73215 Jul 19 09:59 blk_1073741857_1033.meta

-rw-rw-r--. 1 hadoop hadoop       168 Jul 19 13:05 blk_1073741858

-rw-rw-r--. 1 hadoop hadoop        11 Jul 19 13:05 blk_1073741858_1034.meta

-rw-rw-r--. 1 hadoop hadoop        71 Jul 20 15:20 blk_1073741866

-rw-rw-r--. 1 hadoop hadoop        11 Jul 20 15:20 blk_1073741866_1042.meta

[hadoop@weekend110 finalized]$

以上是weekend110的hdfs源码跟踪之打开输入流

下面，继续，weekend110的hdfs源码跟踪之打开输入流总结

1 weekend110的hdfs源码跟踪之打开输入流 + hdfs源码跟踪之打开输入流总结