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HDFS, mail # user - Re: Possible to run an application jar as a hadoop daemon?


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Re: Possible to run an application jar as a hadoop daemon?
John Hancock 2013-01-06, 11:14
Krishna,

You should be able to take the command you are using to start the hadoop
job (hadoop jar ..) and paste it into a text file.  Then make the file
executable and call it as a shell script in a CRON job (crontab -e).  To be
safe, use absolute paths to reference any files in the command.

Or, I suppose what you crazy kids and your object oriented programming
would do is use Quartz.
-John

On Sat, Jan 5, 2013 at 4:33 PM, Chitresh Deshpande <
[EMAIL PROTECTED]> wrote:

> Hi Krishna,
>
> I dont know what do you mean by Hadoop daemon, but if you mean run when
> all the other hadoop daemons like namenode, datanode etc are started, then
> you can change start-all file in conf directory.
>
> Thanks and Regards,
> Chitresh Deshpande
>
>
> On Fri, Jan 4, 2013 at 6:40 AM, Krishna Rao <[EMAIL PROTECTED]>wrote:
>
>> Hi al,
>>
>> I have a java application jar that converts some files and writes
>> directly into hdfs.
>>
>> If I want to run the jar I need to run it using "hadoop jar <application
>> jar>", so that it can access HDFS (that is running "java -jar <application
>> jar> results in a HDFS error").
>>
>> Is it possible to run an jar as a hadoop daemon?
>>
>> Cheers,
>>
>> Krishna
>>
>
>