linux查看hdfs

Ⅰ hdfs block 在linux的哪个目录

可以fdisk -l 看到 但是它本身是自己的文件系统 就是hdfs 你从linux本地是看不到的 想看里面的文件可以使用如下命令 hadoop fs -ls！

Ⅱ HDFS用户目录对应Linux哪个目录

可以fdisk -l 看到 但是它本身是自己的文件系统 就是hdfs 你从linux本地是看不到的 想看里面的文件可以使用如下命令 hadoop fs -ls

Ⅲ hadoop操作命令记录在哪

Hadoop自身是否有记录不清楚，但Hadoop是部署在linux上的，可以通过linux的历史命令查看。
1、history
2、fc -l
可以用grep过滤，例如：
history | grep 'hadoop'
或history | grep 'hdfs'

Ⅳ linux下怎么知道hadoop安装成功

验证Hadoop是否安装成功主要通过以下两个网址。

http: //localhost:50030(MapRece的页面)

http: //localhost:50070(HDFS的页面)

如果都能查看，说明安装成功。

一： 查看HDFS是否正常启动。在浏览器中输入http: //localhost:50070

以上界面为MapRece的管理界面，此界面表明MapRece的JobTracker已经正常启动了。

Ⅳ Linux里面hdfs作用是什么

Hadoop分布式文件系统(HDFS)是指被设计成适合运行在通用硬件(commodity hardware)上的分布式文件系统（Distributed File System）。它和现有的分布式文件系统有很多共同点。但同时，它和其他的分布式文件系统的区别也是很明显的。HDFS是一个高度容错性的系统，适合部署在廉价的机器上。HDFS能提供高吞吐量的数据访问，非常适合大规模数据集上的应用。HDFS放宽了一部分POSIX约束，来实现流式读取文件系统数据的目的。HDFS在最开始是作为Apache Nutch搜索引擎项目的基础架构而开发的。HDFS是Apache Hadoop Core项目的一部分。
HDFS有着高容错性（fault-tolerant）的特点，并且设计用来部署在低廉的（low-cost）硬件上。而且它提供高吞吐量（high throughput）来访问应用程序的数据，适合那些有着超大数据集（large data set）的应用程序。HDFS放宽了（relax）POSIX的要求（requirements）这样可以实现流的形式访问（streaming access）文件系统中的数据。

Ⅵ 查看hdfs各目录分别占用多少空间

[hadoop@slave3 java]$ hadoop fs -help
Usage: hadoop fs [generic options]
[-appendToFile <localsrc> ... <dst>]
[-cat [-ignoreCrc] <src> ...]
[-checksum <src> ...]
[-chgrp [-R] GROUP PATH...]
[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
[-chown [-R] [OWNER][:[GROUP]] PATH...]
[-FromLocal [-f] [-p] [-l] <localsrc> ... <dst>]
[-ToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] [-h] <path> ...]
[-cp [-f] [-p | -p[topax]] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[- [-s] [-h] <path> ...]
[-expunge]
[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <path>]
[-getfattr [-R] {-n name | -d} [-e en] <path>]
[-getmerge [-nl] <src> <localdst>]
[-help [cmd ...]]
[-ls [-d] [-h] [-R] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]
[-mv <src> ... <dst>]
[-put [-f] [-p] [-l] <localsrc> ... <dst>]
[-renameSnapshot <snapshotDir> <oldName> <newName>]
[-rm [-f] [-r|-R] [-skipTrash] <src> ...]
[-rmdir [--ignore-fail-on-non-empty] <dir> ...]
[-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]
[-setfattr {-n name [-v value] | -x name} <path>]
[-setrep [-R] [-w] <rep> <path> ...]
[-stat [format] <path> ...]
[-tail [-f] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touchz <path> ...]
[-usage [cmd ...]]

-appendToFile <localsrc> ... <dst> :
Appends the contents of all the given local files to the given dst file. The dst
file will be created if it does not exist. If <localSrc> is -, then the input is
read from stdin.

-cat [-ignoreCrc] <src> ... :
Fetch all files that match the file pattern <src> and display their content on
stdout.

-checksum <src> ... :
Dump checksum information for files that match the file pattern <src> to stdout.
Note that this requires a round-trip to a datanode storing each block of the
file, and thus is not efficient to run on a large number of files. The checksum
of a file depends on its content, block size and the checksum algorithm and
parameters used for creating the file.

-chgrp [-R] GROUP PATH... :
This is equivalent to -chown ... :GROUP ...

-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH... :
Changes permissions of a file. This works similar to the shell's chmod command
with a few exceptions.

-R modifies the files recursively. This is the only option currently
supported.
<MODE> Mode is the same as mode used for the shell's command. The only
letters recognized are 'rwxXt', e.g. +t,a+r,g-w,+rwx,o=r.
<OCTALMODE> Mode specifed in 3 or 4 digits. If 4 digits, the first may be 1 or
0 to turn the sticky bit on or off, respectively. Unlike the
shell command, it is not possible to specify only part of the
mode, e.g. 754 is same as u=rwx,g=rx,o=r.

If none of 'augo' is specified, 'a' is assumed and unlike the shell command, no
umask is applied.

-chown [-R] [OWNER][:[GROUP]] PATH... :
Changes owner and group of a file. This is similar to the shell's chown command
with a few exceptions.

-R modifies the files recursively. This is the only option currently
supported.

If only the owner or group is specified, then only the owner or group is
modified. The owner and group names may only consist of digits, alphabet, and
any of [-_./@a-zA-Z0-9]. The names are case sensitive.

WARNING: Avoid using '.' to separate user name and group though Linux allows it.
If user names have dots in them and you are using local file system, you might
see surprising results since the shell command 'chown' is used for local files.

-FromLocal [-f] [-p] [-l] <localsrc> ... <dst> :
Identical to the -put command.

-ToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst> :
Identical to the -get command.

-count [-q] [-h] <path> ... :
Count the number of directories, files and bytes under the paths
that match the specified file pattern. The output columns are:
DIR_COUNT FILE_COUNT CONTENT_SIZE FILE_NAME or
QUOTA REMAINING_QUOTA SPACE_QUOTA REMAINING_SPACE_QUOTA
DIR_COUNT FILE_COUNT CONTENT_SIZE FILE_NAME
The -h option shows file sizes in human readable format.

-cp [-f] [-p | -p[topax]] <src> ... <dst> :
Copy files that match the file pattern <src> to a destination. When ing
multiple files, the destination must be a directory. Passing -p preserves status
[topax] (timestamps, ownership, permission, ACLs, XAttr). If -p is specified
with no <arg>, then preserves timestamps, ownership, permission. If -pa is
specified, then preserves permission also because ACL is a super-set of
permission. Passing -f overwrites the destination if it already exists. raw
namespace extended attributes are preserved if (1) they are supported (HDFS
only) and, (2) all of the source and target pathnames are in the /.reserved/raw
hierarchy. raw namespace xattr preservation is determined solely by the presence
(or absence) of the /.reserved/raw prefix and not by the -p option.

-createSnapshot <snapshotDir> [<snapshotName>] :
Create a snapshot on a directory

-deleteSnapshot <snapshotDir> <snapshotName> :
Delete a snapshot from a directory

-df [-h] [<path> ...] :
Shows the capacity, free and used space of the filesystem. If the filesystem has
multiple partitions, and no path to a particular partition is specified, then
the status of the root partitions will be shown.

-h Formats the sizes of files in a human-readable fashion rather than a number
of bytes.

- [-s] [-h] <path> ... :
Show the amount of space, in bytes, used by the files that match the specified
file pattern. The following flags are optional:

-s Rather than showing the size of each indivial file that matches the
pattern, shows the total (summary) size.
-h Formats the sizes of files in a human-readable fashion rather than a number
of bytes.

Note that, even without the -s option, this only shows size summaries one level
deep into a directory.

The output is in the form
size disk space consumed name(full path)

-expunge :
Empty the Trash

-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst> :
Copy files that match the file pattern <src> to the local name. <src> is kept.
When ing multiple files, the destination must be a directory. Passing -p
preserves access and modification times, ownership and the mode.

-getfacl [-R] <path> :
Displays the Access Control Lists (ACLs) of files and directories. If a
directory has a default ACL, then getfacl also displays the default ACL.

-R List the ACLs of all files and directories recursively.
<path> File or directory to list.

-getfattr [-R] {-n name | -d} [-e en] <path> :
Displays the extended attribute names and values (if any) for a file or
directory.

-R Recursively list the attributes for all files and directories.
-n name Dump the named extended attribute value.
-d Dump all extended attribute values associated with pathname.
-e <encoding> Encode values after retrieving them.Valid encodings are "text",
"hex", and "base64". Values encoded as text strings are enclosed
in double quotes ("), and values encoded as hexadecimal and
base64 are prefixed with 0x and 0s, respectively.
<path> The file or directory.

-getmerge [-nl] <src> <localdst> :
Get all the files in the directories that match the source file pattern and
merge and sort them to only one file on local fs. <src> is kept.

-nl Add a newline character at the end of each file.

-help [cmd ...] :
Displays help for given command or all commands if none is specified.

-ls [-d] [-h] [-R] [<path> ...] :
List the contents that match the specified file pattern. If path is not
specified, the contents of /user/<currentUser> will be listed. Directory entries
are of the form:
permissions - userId groupId sizeOfDirectory(in bytes)
modificationDate(yyyy-MM-dd HH:mm) directoryName

and file entries are of the form:
permissions numberOfReplicas userId groupId sizeOfFile(in bytes)
modificationDate(yyyy-MM-dd HH:mm) fileName

-d Directories are listed as plain files.
-h Formats the sizes of files in a human-readable fashion rather than a number
of bytes.
-R Recursively list the contents of directories.

很简单明了，前面的数字即为目录所占空间的大小，后面的因为我前期 备份数为3 后期改为2 所以可能会不一样

Ⅶ linux中如何查看hadoop文件中的数据

namenode就是master。 必须要有一台启动namenode服务。 ============= 如果只需要 datanode，那么jps 命令后，查看到线程ID 然后kill 掉就好了。 注意 kill掉 namenode后，整个hadoop集群就宕掉了。

Ⅷ 怎么查者、删除、移动、拷贝HDFS上的文件

删除复制移动文件命令

Linux代码
rm -rf /file

-r：递归处理参数
-f：强制删除所有文件

Linux代码
cp /test1/file1 /test3/file2
将file1复制到test3下，并改名为file2

Linux代码
cp -a test test1
将test目录下的所有子目录复制到test1下

Linux代码
mv /test1/file1 /test2/test2

将file1移动到test2下，并改名为test2

Ⅸ 怎么查看hdfs linux 路径

可以fdisk -l 看到 但是它本身是自己的文件系统 就是hdfs 你从linux本地是看不到的 想看里面的文件可以使用如下命令 hadoop fs -ls

Ⅹ Linux的hadoop运行hadoop的时候出现错误：找不到或者无法加载主类 org.apache.hadoop.fs.FsShell

Linux的hadoop运行hadoop的时候出现错误：找不到或者无法加载主类 org.apache.hadoop.fs.FsShell是设置错误造成的，解决方法为：

1、打开Vmware虚拟机，打开三个虚拟机。