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Child Error - MapReduce - [mail # user]
...Hello, I have a 20 node Hadoop cluster where each node has 8GB memory and an 8-core processor. I sometimes get the following error on a random basis:    Exception in thread "main" ...
   Author: Jim Twensky, 2013-05-24, 00:14
Re: Question on HDFS_BYTES_READ and HDFS_BYTES_WRITTEN - MapReduce - [mail # user]
...Hello Harsh,  Thanks for the useful feedback. You were right. My map tasks open additional files from hdfs. The catch was that I had thousands of map tasks being created and each of the...
   Author: Jim Twensky, 2013-05-17, 21:50
Re: Wrapping around BitSet with the Writable interface - MapReduce - [mail # user]
...Thanks for the suggestions. I ended up switching to jdk 1.7+ just to make the code more readable. I will take a look at the EWAH implementation as well.  Jim   On Sun, May 12, 2013...
   Author: Jim Twensky, 2013-05-13, 15:51
Redundant synchronization in ReduceTask.java - MapReduce - [mail # dev]
...Hi,  I have recently been reading Hadoop 1.1.0 source code to better understand the internals and learned a lot from it, so far. When I was looking at ReduceTask.java, I saw some synchr...
   Author: Jim Twensky, 2012-12-08, 20:58
Re: Chaning Multiple Reducers: Reduce -> Reduce -> Reduce - MapReduce - [mail # user]
...Thank you for the comments. Some similar frameworks I looked at include Haloop, Twister, Hama, Giraph and Cascading. I am also doing large scale graph processing so I assumed one of them cou...
   Author: Jim Twensky, 2012-10-08, 19:09
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