Top "Hadoop" questions

How to check if ZooKeeper is running or up from command prompt?

I exploring a few options to setup kafka and I knew that the Zookeeper has to be up and running …

hadoop config apache-zookeeper apache-kafka ps

Hive query output to file

I run hive query by java code. Example: "SELECT * FROM table WHERE id > 100" How to export result to hdfs …

hadoop hive

Inserting Data into Hive Table

I am new to hive. I have successfully setup a single node hadoop cluster for development purpose and on top …

sql insert hadoop hive

how to replace characters in hive?

I have a string column description in a hive table which may contain tab characters '\t', these characters are …

hadoop hive

Hadoop cluster setup - java.net.ConnectException: Connection refused

I want to setup a hadoop-cluster in pseudo-distributed mode. I managed to perform all the setup-steps, including startuping a Namenode, …

java hadoop configuration connectexception

How to export data from Spark SQL to CSV

This command works with HiveQL: insert overwrite directory '/data/home.csv' select * from testtable; But with Spark SQL I'm …

hadoop apache-spark export-to-csv hiveql apache-spark-sql

Where does Hive store files in HDFS?

I'd like to know how to find the mapping between Hive tables and the actual HDFS files (or rather, directories) …

hadoop hive hdfs

When to use Hadoop, HBase, Hive and Pig?

What are the benefits of using either Hadoop or HBase or Hive ? From my understanding, HBase avoids using map-reduce and …

hadoop hbase hive apache-pig

Add a column in a table in HIVE QL

I'm writing a code in HIVE to create a table consisting of 1300 rows and 6 columns: create table test1 as SELECT …

hadoop hive hiveql

How to load a text file into a Hive table stored as sequence files

I have a hive table stored as a sequencefile. I need to load a text file into this table. How …

hadoop hive