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From Stan Rosenberg <stan.rosenb...@gmail.com>
Subject Re: task jvm bootstrapping via distributed cache
Date Tue, 31 Jul 2012 15:55:37 GMT
I am guessing this is either a well-known problem or an edge case.  In
any case, would it be a bad idea to designate predetermined output
E.g., DistributedCache.addCacheFileInto(uri, conf, outputPath) would
attempt to copy the cached file into the specified path resolving to a
task's local filesystem.



On Mon, Jul 30, 2012 at 6:23 PM, Stan Rosenberg
<stan.rosenberg@gmail.com> 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

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