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From Harsh J <ha...@cloudera.com>
Subject Re: about hadoop-2.2.0 "mapred.child.java.opts"
Date Wed, 04 Dec 2013 07:58:12 GMT
Yes but the old property is yet to be entirely removed (removal of
configs is graceful).

These properties were introduced to provide more fine-tuned way to
configure each type of task separately, but the older value continues
to be accepted if present; the current behaviour is that if the MR
runtime finds mapred.child.java.opts configured, it will override
values of mapreduce.map|reduce.java.opts configs. To configure
mapreduce.map|reduce.java.opts therefore, you should make sure you
aren't passing mapred.child.java.opts (which is also no longer in the
mapred-default.xml intentionally).

On Wed, Dec 4, 2013 at 12:56 PM, Henry Hung <YTHung1@winbond.com> wrote:
> Hello,
> I have a question.
> Is it correct to say that in hadoop-2.2.0, the mapred-site.xml node
> "mapred.child.java.opts” is replaced by two new node
> “mapreduce.map.java.opts” and “mapreduce.reduce.java.opts”?
> Best regards,
> Henry
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Harsh J

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