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MapReduce, mail # user - task jvm bootstrapping via distributed cache


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Re: task jvm bootstrapping via distributed cache
Arun C Murthy 2012-08-03, 20:19
Just do -javaagent:./profiler.jar?

On Aug 3, 2012, at 9:32 AM, Stan Rosenberg wrote:

> Arun,
>
> I don't believe the symlink is of help.  The symlink is created in the
> task's current working directory (cwd), but I don't know what cwd is
> when I launch with 'hadoop jar ...'.
>
> Thanks,
>
> stan
>
> On Fri, Aug 3, 2012 at 2:39 AM, Arun C Murthy <[EMAIL PROTECTED]> wrote:
>> Stan,
>>
>> You can ask TT to create a symlink to your jar shipped via DistCache:
>>
>> http://hadoop.apache.org/common/docs/r1.0.3/mapred_tutorial.html#DistributedCache
>>
>> That should give you what you want.
>>
>> hth,
>> Arun
>>
>> On Jul 30, 2012, at 3:23 PM, Stan Rosenberg wrote:
>>
>> Hi,
>>
>> I am seeking a way to leverage hadoop's distributed cache in order to
>> ship jars that are required to bootstrap a task's jvm, i.e., before a
>> map/reduce task is launched.
>> As a concrete example, let's say that I need to launch with
>> '-javaagent:/path/profiler.jar'.  In theory, the task tracker is
>> responsible for downloading cached files onto its local filesystem.
>> However, the absolute path to a given cached file is not known a
>> priori; however, we need the path in order to configure '-javaagent'.
>>
>> Is this currently possible with the distributed cache? If not, is the
>> use case appealing enough to open a jira ticket?
>>
>> Thanks,
>>
>> stan
>>
>>
>> --
>> Arun C. Murthy
>> Hortonworks Inc.
>> http://hortonworks.com/
>>
>>

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/