Popular "mapreduce" questions | Page 13

This is my file: Col1, Col2, Col3, Col4, Col5 I need only Col2 and Col3. Currently I'm doing this: a = …

hadoop mapreduce apache-pig

I was learning hadoop, I found number of reducers very confusing : 1) Number of reducers is same as number of partitions. 2) …

hadoop mapreduce hadoop2 reducers bigdata

Question to all Cassandra experts out there. I have a column family with about a million records. I would like …

mapreduce cassandra cql3

The Namenode in the Hadoop architecture is a single point of failure. How do people who have large Hadoop clusters …

hadoop mapreduce hdfs yarn hadoop2

I'm using Sqoop version 1.4.2 and Oracle database. When running Sqoop command. For example like this: ./sqoop import \ --fs <name …

oracle hadoop mapreduce hdfs sqoop

I have two files in my cluster File A and File B with the following data - File A #Format: #…

python hadoop mapreduce hadoop-streaming

I have installed Cloudera VM version 5.8 on my machine. When I execute word count mapreduce job, it throws below exception. `16/09/06 06:55:49 …

hadoop mapreduce cloudera hortonworks-data-platform hortonworks-sandbox

Does the Hadoop split the data based on the number of mappers set in the program? That is, having a …

hadoop mapreduce hadoop-partitioning

I'm doing some data preparation using a single node hadoop job. The mapper/combiner in my job outputs many keys (…

hadoop mapreduce hadoop2

We all know that the block size in HDFS is pretty large (64M or 128M) as compared to the block …

hadoop mapreduce hdfs

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