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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 08:20:25 GMT
Actually, its the other way around (thanks Sandy for catching this
error in my post). The presence of mapreduce.map|reduce.java.opts
overrides mapred.child.java.opts, not the other way round as I had
stated earlier (below).

On Wed, Dec 4, 2013 at 1:28 PM, Harsh J <harsh@cloudera.com> wrote:
> 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

Harsh J

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