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Re: what all can be done using MR - HDFS - [mail # user]
...Yes. Check out, for example,  http://packtlib.packtpub.com/library/hadoop-mapreduce-cookbook/ch06lvl1sec66#   On 1/8/2014 2:41 AM, unmesha sreeveni wrote:  ...
   Author: Chris Mawata, 2014-01-08, 14:48
Re: Distributing the code to multiple nodes - HDFS - [mail # user]
...2 nodes and replication factor of 2 results in a replica of each block present on each node. This would allow the possibility that a single node would do the work and yet be data local. &nbs...
   Author: Chris Mawata, 2014-01-08, 13:46
Re: External db - HDFS - [mail # user]
...Hi Kishore,    you are comparing apples and oranges. HDFS is a file system (you read  and write files to it). The NoSQL datastores are more like a database. You can query and ...
   Author: Chris Mawata, 2013-12-15, 21:06
[expand - 1 more] - Re: NO DataNode Daemon on a single node Hadoop 2.2 installation - HDFS - [mail # user]
...Thanks for the feedback. If you need to re-format you should delete both  the NameNode data and the DataNode data dir as the Datanode stores  version information and will not conne...
   Author: Chris Mawata, 2013-12-15, 20:59
Re: Site-specific dfs.client.local.interfaces setting not respected for Yarn MR container - HDFS - [mail # user]
...You might have better luck with an alternative approach to avoid having  IPV6 which is to add to your hadoop-env.sh  HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true  ...
   Author: Chris Mawata, 2013-12-15, 20:57
Re: Would it be possible to install two version of Hadoop on the same cluster? - HDFS - [mail # user]
...If you are planning to take measurements when both are running they  won't be representative of either one. For instance, your network could  look like a bottleneck when both are r...
   Author: Chris Mawata, 2013-12-12, 11:04
Re: which is better : form reducer or Driver - HDFS - [mail # user]
...If you have multiple reducers you are doing it in parallel while in the  driver it is surely single threaded so my bet would be on the reducers.  Chris  On 11/5/2013 6:15 AM, ...
   Author: Chris Mawata, 2013-11-05, 12:58
Re: Namenode / Cluster scaling issues in AWS environment - HDFS - [mail # user]
...You might also consider  federation. Chris   On 11/3/2013 3:21 AM, Manish Malhotra wrote:...
   Author: Chris Mawata, 2013-11-03, 14:14
Re: HDFS / Federated HDFS - Doubts - HDFS - [mail # user]
...Don't know about question 4 but for the first three -- the metadata is  in the memory of the namenode at runtime but is also persisted to disk  (otherwise it would be lost if you s...
   Author: Chris Mawata, 2013-10-02, 18:41
[expand - 1 more] - Re: Problems - HDFS - [mail # user]
...Thanks -- that would explain why I have not got into trouble yet as I am  only using MR and HDFS. On 1/17/2013 5:40 PM, Andy Isaacson wrote:...
   Author: Chris Mawata, 2013-01-18, 00:20
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