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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
Re: Transpose - HDFS - [mail # user]
...Hi,  Essentially what you want to do is group your data points by their position in the column, and have each reduce call construct the data for each row into a row.  To have each ...
   Author: Sandy Ryza, 2013-03-05, 17:27
Re: Accumulo and Mapreduce - HDFS - [mail # user]
...Hi Aji,  Oozie is a mature project for managing MapReduce workflows. http://oozie.apache.org/  -Sandy   On Mon, Mar 4, 2013 at 8:17 AM, Justin Woody  wrote:  ...
   Author: Sandy Ryza, 2013-03-04, 18:14
Re: Custom output value for map function - HDFS - [mail # user]
...That's right, the date needs to be written and read in the same order.  On Wed, Feb 27, 2013 at 11:04 AM, Paul van Hoven  wrote:  ...
   Author: Sandy Ryza, 2013-02-27, 19:50
Re: Generic output key class - HDFS - [mail # user]
...Hi Amit,  One way to accomplish this would be to create a custom writable implementation, TextOrIntWritable, that has fields for both.  It could look something like:  class Te...
   Author: Sandy Ryza, 2013-02-10, 19:07
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