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From "Jie Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4365) Shipping Profiler Libraries by DistributedCache
Date Mon, 25 Jun 2012 18:40:43 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400766#comment-13400766

Jie Li commented on MAPREDUCE-4365:

Hi Robert,

I don't quite understand your approach, because we need to provide the
path of the profiler libraries to the TaskTracker instead of the
tasks. So if the libraries appear in the task' working directory, how
can the TaskTracker find it when launching the task? And currently TT
doesn't look into the profile parameters to see if there is any
distributed cache entry.
> Shipping Profiler Libraries by DistributedCache
> -----------------------------------------------
>                 Key: MAPREDUCE-4365
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4365
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>    Affects Versions: 1.0.3
>            Reporter: Jie Li
> Hadoop profiling is great for performance tuning and debugging, but currently we can
only use Java built-in profilers such as HProf, and for other profilers we need to install
them on all slave nodes first, which is inconvenient for large clusters and sometimes impossible
for production clusters. 
> Supporting shipping profiler libraries using DistributedCache will solve this problem.
For example, in mapred.task.profile.params, we specify a profiler library from the DistributedCache
using special place holders such as <foo.jar>, and Hadoop can look at the DistributedCache
to replace <foo.jar> with the localized path before launching the child jvm.

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