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Re: SequenceFileAsBinaryOutputFormat for M/R - Hadoop - [mail # user]
...In the 0.20 branch, the common best-practice is to use the old API and ignore deprecation warnings. When you get to 0.22, you'll need to convert all your code to use the new API.  There...
   Author: Aaron Kimball, 2009-09-22, 22:52
Re: RandomAccessFile with HDFS - Hadoop - [mail # user]
...Or maybe more pessimistically, the second "stable" append implementation.  It's not like HADOOP-1700 wasn't intended to work. It was just found not to after the fact. Hopefully this rei...
   Author: Aaron Kimball, 2009-09-22, 22:50
Re: copy data (distcp) from local cluster to the EC2 cluster - Hadoop - [mail # user]
...That's 99% correct. If you want/need to run different versions of HDFS on the two different clusters, then you can't use hdfs:// protocol to access both of them in the same command. In this ...
   Author: Aaron Kimball, 2009-09-11, 00:31
Re: Testing Hadoop job - Hadoop - [mail # user]
...Hi Nikhil,  MRUnit now supports the 0.20 API as of https://issues.apache.org/jira/browse/MAPREDUCE-800. There are no plans to involve partitioners in MRUnit; it is for mappers and reduc...
   Author: Aaron Kimball, 2009-08-29, 00:50
Re: Help. - Hadoop - [mail # user]
...Are you trying to serve blocks from a shared directory e.g. NFS?  The storageID for a node is recorded in a file named "VERSION" in ${dfs.data.dir}/current. If one node claims that the ...
   Author: Aaron Kimball, 2009-08-25, 08:26
Re: localhost:9000 and ip:9000 is not the same ? - Hadoop - [mail # user]
...Jeff,  Hadoop (HDFS in particular) is overly strict about machine names. The filesystem's id is based on the DNS name used to access it. This needs to b e consistent across all nodes an...
   Author: Aaron Kimball, 2009-08-25, 00:52
Re: How to speed up the copy phrase? - Hadoop - [mail # user]
...If you've got 20 nodes, then you want to have 20-ish reduce tasks. Maybe 40 if you want it to run in two waves. (Assuming 1 core/node. Multiply by N for N cores...) As it is, each node has 5...
   Author: Aaron Kimball, 2009-08-25, 00:49
Re: Hadoop streaming: How is data distributed from mappers to reducers? - Hadoop - [mail # user]
...Yes. It works just like Java-based MapReduce in that regard. - Aaron  On Sun, Aug 23, 2009 at 5:09 AM, Nipun Saggar wrote:  ...
   Author: Aaron Kimball, 2009-08-25, 00:43
Re: Writing to a db with DBOutputFormat spits out IOException Error - Hadoop - [mail # user]
...As a more general note -- any jars needed by your mappers and reducers either need to be in your job jar in the lib/ directory of the .jar file, or in $HADOOP_HOME/lib/ on all tasktracker no...
   Author: Aaron Kimball, 2009-08-25, 00:42
Re: NN memory consumption on 0.20/0.21 with compressed pointers/ - Hadoop - [mail # user]
...Compressed OOPs are available now in 1.6.0u14: https://jdk6.dev.java.net/6uNea.html - Aaron  On Thu, Aug 20, 2009 at 10:51 AM, Raghu Angadi wrote:  ...
   Author: Aaron Kimball, 2009-08-20, 22:04
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