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Re: Yarn job stuck with no application master being assigned - HDFS - [mail # user]
...Hi Siddhi,  Moving this question to the CDH list.  Does setting yarn.scheduler.capacity.maximum-am-resource-percent to .5 help?  Have you tried using the Fair Scheduler?  ...
   Author: Sandy Ryza, 2013-06-21, 23:28
Re: container allocation - HDFS - [mail # user]
...Hi John,  At this time, releasing containers is the preferred way to be strict about your locality requirements.  This is not included in a release yet, but https://issues.apache.o...
   Author: Sandy Ryza, 2013-06-14, 19:50
Re: built hadoop! please help with next steps? - HDFS - [mail # user]
...I've been successful with importing all the leaf-level maven projects as "Existing Maven Projects" using the eclipse maven plugin.  I've also gotten things to work without the eclipse m...
   Author: Sandy Ryza, 2013-05-31, 22:22
Re: Is there a way to limit # of hadoop tasks per user at runtime? - HDFS - [mail # user]
...Hi Mehmet,  Are you using MR1 or MR2?  The fair scheduler, present in both versions, but configured slightly differently, allows you to limit the number of map and reduce tasks in ...
   Author: Sandy Ryza, 2013-05-21, 21:57
Re: Automatically mapping a job submitted by a particular user to a specific hadoop map-reduce queue - HDFS - [mail # user]
...Sagar,  I'm glad to hear that it would help.  Unfortunately, we are no longer adding features to CDH3, so you would have to upgrade to CDH4 or backport it yourself to use it.  ...
   Author: Sandy Ryza, 2013-04-26, 18:38
Re: Streaming value of (200MB) from a SequenceFile - HDFS - [mail # user]
...Hi Rahul,  I don't think saving the stream for later use would work - I was just suggesting that if only some aggregate statistics needed to be calculated, they could be calculated at r...
   Author: Sandy Ryza, 2013-04-01, 05:59
Re: Yarn communication between containers - HDFS - [mail # user]
...Hi tmp,  YARN doesn't provide an explicit protocol for doing this.  Applications are expected to have their own mechanism for communication between task containers, other task cont...
   Author: Sandy Ryza, 2013-03-27, 18:52
[HDFS-4620] Documentation for dfs.namenode.rpc-address specifies wrong format - HDFS - [issue]
...The doc says it's supposed to look like hdfs://nn-host1:rpc-port, when it fact is' supposed to just look like nn-host1:rpc-port...
http://issues.apache.org/jira/browse/HDFS-4620    Author: Sandy Ryza, 2013-03-22, 14:05
Re: Too many open files error with YARN - HDFS - [mail # user]
...Hi Kishore,  50010 is the datanode port. Does your lsof indicate that the sockets are in CLOSE_WAIT?  I had come across an issue like this where that was a symptom.  -Sandy &n...
   Author: Sandy Ryza, 2013-03-20, 17:39
Re: Question regarding hadoop jar command usage - HDFS - [mail # user]
...Hi Kay,  Yeah, that line does set your jar as the job jar.  "hadoop jar" expects java code to configure and submit your job.  "mapred job" takes in a job.xml configuration fil...
   Author: Sandy Ryza, 2013-03-13, 18:34
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