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Re: Resource manager question - Yarn - MapReduce - [mail # user]
...The reason is that you don't want a socket to the RM machine to be held up - we expect to have thousands of AMs running concurrently. Essentially a blocking call could result in a DoS attack...
   Author: Arun C Murthy, 2013-06-10, 21:07
Re: log4j defaults for AM & task - MapReduce - [mail # user]
...Unfortunately this isnt' well documented, but if the cmd-line for your container has , that variable will be substituted by the NodeManager with the directory where the logs will be put. &nb...
   Author: Arun C Murthy, 2013-06-06, 20:24
Re: YARN task default output - MapReduce - [mail # user]
...You can enable log-aggregation where-by your application logs will be uploaded to HDFS.  Overview here: http://hortonworks.com/blog/apache-hadoop-yarn-nodemanager/  Configurations ...
   Author: Arun C Murthy, 2013-06-06, 20:07
Re: What else can be built on top of YARN. - MapReduce - [mail # user]
...John,  On Jun 1, 2013, at 7:02 AM, John Lilley wrote:   You might be interested in MPICH2 on YARN: https://github.com/clarkyzl/mpich2-yarn  Disclaimer: I haven't used it mysel...
   Author: Arun C Murthy, 2013-06-06, 13:41
Re: Management API - MapReduce - [mail # user]
...You might want to look at Apache Ambari - it's got a pretty comprehensive set of APIs of the kind you seek.  https://github.com/apache/ambari/blob/trunk/ambari-server/docs/api/v1/index....
   Author: Arun C Murthy, 2013-06-06, 13:37
[MAPREDUCE-259] Rack-aware Shuffle - MapReduce - [issue]
...We could try and experiment with rack-aware scheduling of fetches per-reducer. Given the disparities between in-rack and off-rack bandwidth it could be a improvement to do something along th...
http://issues.apache.org/jira/browse/MAPREDUCE-259    Author: Arun C Murthy, 2013-05-25, 03:20
Re: MAPREDUCE-5183 PATCH submission - MapReduce - [mail # dev]
...Thanks! And welcome!  On May 22, 2013, at 8:21 PM, maisnam ns wrote:   Arun C. Murthy Hortonworks Inc. http://hortonworks.com/  ...
   Author: Arun C Murthy, 2013-05-23, 18:13
[MAPREDUCE-4916] TestTrackerDistributedCacheManager is flaky due to other badly written tests in branch-1 - MapReduce - [issue]
...Credit to Xuan figuring this: TestTrackerDistributedCacheManager is flaky due to other badly written tests since it checks for existence of a directory upfront which might have bad perms....
http://issues.apache.org/jira/browse/MAPREDUCE-4916    Author: Arun C Murthy, 2013-05-15, 06:16
[MAPREDUCE-3751] Simplify job submission in gridmix - MapReduce - [issue]
...Currently gridmix tries to gauge cluster load etc. and throttles job submission. This makes it unpredictable and also is hard to support across MR1 and MR2. I propose we simplify it to be: R...
http://issues.apache.org/jira/browse/MAPREDUCE-3751    Author: Arun C Murthy, 2013-05-14, 05:33
[MAPREDUCE-5223] ant package shouldn't build task-controller by default - MapReduce - [issue]
...ant package shouldn't build task-controller by default, not sure when we broke this. task-controller should have to be explicitly built via '-Dtask-controller' option.This breaks tar creatio...
http://issues.apache.org/jira/browse/MAPREDUCE-5223    Author: Arun C Murthy, 2013-05-08, 17:49
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