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Hadoop >> mail # user >> Which config parameters are node-specific?


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Re: Which config parameters are node-specific?
I believe all these parameters can be set as node-specific, because they are
in different JVM.
Correct me if I am wrong.

On Wed, Jan 20, 2010 at 8:31 AM, Zhang, Zhang <[EMAIL PROTECTED]>wrote:

>
> Where do I find information about which config parameters can be set as
> per-node property, and which ones apply to all nodes? For example, I have a
> cluster consisting of two classes of nodes. One class is dual-core 4GB
> memory nodes, and the other class is 16-core 128GB memory nodes. It
> certainly makes sense to configure them differently. So the questions is,
> which parameters I should pay attention to? I vaguely know that probably at
> least the following ones can be set as node-specific:
>
>    mapred.tasktracker.map.tasks.maximum
>    mapred.tasktracker.reduce.tasks.maximum
>
>
> But anything beyond that? How about the following ones, can I set them as
> node-specific parameters?
>
>    mapred.child.java.opts
>    tasktracker.http.threads
>    dfs.datanode.handler.count
>    io.sort.factor
>    io.sort.mb
>    mapred.inmem.merge.threshold
>    mapred.job.reduce.input.buffer.percent
>
>
> Thanks!
>
> Zhang
>
>
--
Best Regards

Jeff Zhang