[jira] Commented: (HADOOP-4868) Split the hadoop script into 3 parts

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678979#action_12678979 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-4868:
------------------------------------------------

On a second thought, this may not be an incompatible change.  Please correct me if I was wrong.

However, I think it is good to add release note since it is not clear how to use the new scripts.  The error message "Instead use the hdfs command for it." seems saying that we should use "./bin/hadoop hdfs ..."
{noformat}
bash-3.2$ ./bin/hadoop dfsadmin   
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

Usage: java DFSAdmin
           [-report]
           [-safemode enter | leave | get | wait]
           [-saveNamespace]
           [-restoreFailedStorage true|false|check]
           [-refreshNodes]
           [-finalizeUpgrade]
           [-upgradeProgress status | details | force]
           [-metasave filename]
           [-refreshServiceAcl]
           [-setQuota <quota> <dirname>...<dirname>]
           [-clrQuota <dirname>...<dirname>]
           [-setSpaceQuota <quota> <dirname>...<dirname>]
           [-clrSpaceQuota <dirname>...<dirname>]
           [-help [cmd]]

Generic options supported are
-conf <configuration file>     specify an application configuration file
-D <property=value>            use value for given property
-fs <local|namenode:port>      specify a namenode
-jt <local|jobtracker:port>    specify a job tracker
-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]

bash-3.2$ ./bin/hadoop hdfs    
java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main" bash-3.2$ 
{noformat}

> Split the hadoop script into 3 parts
> ------------------------------------
>
>                 Key: HADOOP-4868
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4868
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Sharad Agarwal
>            Assignee: Sharad Agarwal
>             Fix For: 0.21.0
>
>         Attachments: 4868_v1.patch, 4868_v2.patch, 4868_v3.patch, 4868_v4.patch, namenode-1.log, namenode.log
>
>
> We need to split the bin/hadoop into 3 parts for core, mapred and hdfs. This will enable us to distribute the individual scripts with each component.

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