Top "Hadoop" questions

Alter hive table add or drop column

I have orc table in hive I want to drop column from this table ALTER TABLE table_name drop col_…

hadoop hive

Default Namenode port of HDFS is 50070.But I have come across at some places 8020 or 9000

When I setup the hadoop cluster, I read the namenode runs on 50070 and I set up accordingly and it's running …

hadoop hdfs

Hive - LIKE Operator

I can not figure out how I deal with that problem: This is my Data: Table1: Table2: BRAND PRODUCT SOLD …

hadoop hive hiveql sql-like

How to access s3a:// files from Apache Spark?

Hadoop 2.6 doesn't support s3a out of the box, so I've tried a series of solutions and fixes, including: deploy …

hadoop apache-spark amazon-s3

merge output files after reduce phase

In mapreduce each reduce task write its output to a file named part-r-nnnnn where nnnnn is a partition ID associated …

hadoop mapreduce

how to write case and group by in hive query

This is my hive table: course dept subject status btech cse java pass btech cse hadoop fail btech cse cg …

hadoop hive hiveql

hadoop fs -put command

I have constructed a single-node Hadoop environment on CentOS using the Cloudera CDH repository. When I want to copy a …

shell hadoop hdfs put

Loading Data from a .txt file to Table Stored as ORC in Hive

I have a data file which is in .txt format. I am using the file to load data into Hive …

hadoop hive

Difference between HBase and Hadoop/HDFS

This is kind of naive question but I am new to NoSQL paradigm and don't know much about it. So …

hadoop nosql hbase hdfs difference

Hadoop copy a directory?

Is there an HDFS API that can copy an entire local directory to the HDFS? I found an API for …

hadoop hdfs