How to quit beeline??

I am using CDH 5.5 and need to use beeline. I am pretty new to it and learning it now. I can start beeline but canno...

Is Cassandra for OLAP or OLTP or both??

Cassandra does not comply with ACID like RDBMS but CAP. So Cassandra picks AP out of CAP and leaves it to the user f...

Extract data from MongoDB with Sqoop to write on HDFS??

I am concerning about extracting data from MongoDB where my application transact most of the data from MongoDB. I ...

Writing to a file in Apache Spark?

I am writing a Scala code that requires me to write to a file in HDFS. When I use Filewriter.write on local, it work...

Json object to Parquet format using Java without converting to AVRO(Without using Spark, Hive, Pig,Impala)?

I have a scenario where to convert the messages present as Json object to Apache Parquet format using Java. Any samp...

CASE statements in Hive?

Ok, i have a following code to mark records that have highest month_cd in tabl with binary flag: Select t1.month_cd...

How to choose between apache ranger and sentry?

From the wiki provided by those 2 projects, I found it seems they did the similar job. But there must be some differ...

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 fine. ...

How to copy and convert parquet files to csv?

I have access to a hdfs file system and can see parquet files with hadoop fs -ls /user/foo How can I copy those p...