There is a number of algorithm implementations that require no Hadoop dependencies whatsoever.
Just check this link to check which are the algorithms that doesn't require Hadoop.
No, you can run spark without hadoop. ...READ MORE
The MongoDB Connector for Hadoop reads data ...READ MORE
Yes, it is possible to use HDFS ...READ MORE
Use Hadoop streaming for using python,php etc ...READ MORE
Use of help command in Hadoop sqoop. READ MORE
Though Spark and Hadoop were the frameworks designed ...READ MORE
No, you cannot download HDFS alone because ...READ MORE
The official definition of Apache Hadoop given ...READ MORE
Yes. Not all of the Mahout depends ...READ MORE
Yes, you can. In fact many people ...READ MORE