In my application the reducer saves all the part files in HDFS but I want only the reducer wi开发者_开发技巧ll write the part files whose sizes are not 0bytes.Please let me know how to define it.It is
I\'m using Eucalyptus and am considering putting hdfs and hbase on our node controllers. Would running hba开发者_如何学Cse on some of our instances improve performance, or is it redundant?It depends.A
I have a 3 node hadoop setup, with replication factor as 2. When one of my datanode dies, namenode waits for 10 mins before removing it from live nodes. Till then my hdfs writes 开发者_运维百科fail s
I am using Hadoop example program WordCount to process large set of small files/web pages (cca. 2-3 kB). Since this is far away from optimal file size for hadoop files, the program is very slow. I gue
Somewhat of an odd question, but does anyone know what kind of sort MapReduce uses in the sort portion of shuffle/sort?I would think merge or insertion (in keeping with the whole MapReduce par开发者_如
I am trying to execute a Hadoop job on a remote hadoop cluster. Below is my code. Configuration conf = new Configuration();
This is kind of an odd situation, but I\'m looking for a way to filter using something like MATCHES but on a list of unknown patterns (of unknown length).
$hdfs dfs -rmr crawl 11/04/16 08:49:33 INFO security.Groups: Group mapping impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping; cacheTimeout=300000
I have a map-reduce java program in which I try to only compress the mapper output but not the reducer output. I thought that this would be possible by setting the following properties in the Confi开发
I am hoping to run an impo开发者_开发技巧rt into Hive on a cron, and was hoping just using \"load data local inpath \'/tmp/data/x\' into table X\" into a table would be sufficient.
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