Exception I am getting is, 2011-07-13 12:04:13,006 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.FileNotFoundException: File does not exist: /opt/data/tmp/mapred/system/job_201107041
Our primary purpose is to use Hadoop for doing analytics. In this use case, we do batch processing, so throughput is more important than latency, meaning that HBase is not necessarily a good fit (alth
I want to sort a big dataset efficiently (i.e. with a custom partitioner, like described here: How does the MapReduce sort algorithm work?)开发者_开发技巧, but I want to do it with hive.
I ran a pig script on a hadoop cluster, it pass successfully but i cannot find the result files, here is what it said:
I am new to hadoop and I am learning by using few examples. I am currently trying to pass a file with random integers on it. For each and every number i w开发者_运维知识库ant it to be double base on t
I\'m using Cloudera\'s Hadoop distribution CDH-0.20.2CDH3u0. Is there any way I could the information such as 开发者_如何学Cjobtracker status, tasktracker status, counters using a JAVA program running
I sincerely thank you for reading my post. I\'m trying to install LZO 2.03 compression codec on HBase on my server (running Xeon CPUs).
I have a huge tab delimited file. (10,000 subjects as rows and >1-million assays as columns). I have a mapping file which has information related to each of the 1 million columns.
Google\'s Dremel is described here. What\'s the difference between Dremel and Map开发者_运维百科reduce?Dremel and MapReduce are not directly comparable, but rather they are complementary technologies.
I\'m finding Hadoop on Windows somewhat frustrating: I want to know if there are any serious alternatives to Hadoop for Win32 users. The features I most value are:
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