Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

Does cloudera offer a vm for demonstrating impala?

How do I try impala out?

How does impala compare to hive and pig?

How does impala achieve its performance improvements?

Can I use impala to query data already loaded into hive and hbase?

What happens when the data set exceeds available memory?

How much memory is required?

Are results returned as they become available, or all at once when a query completes?

Why do I have to use refresh and invalidate metadata, what do they do?

Why does my select statement fail?

Does impala performance improve as it is deployed to more hosts in a cluster in much the same way that hadoop performance does?

164

What is RDD in Apache Spark? How are they computed in Spark? what are the various ways in which it can create?

297

What role does worker node play in Apache Spark Cluster? And what is the need to register a worker node with the driver program?

332

What is SparkSession in Apache Spark? Why is it needed?

366

What is the task of Spark Engine

312

Un-Answered Questions { Hadoop }

What is spark executor cores?

272

Whenever we run hive query, new metastore_db is created. Why?

650

What makes Apache Spark good at low-latency workloads like graph processing and machine learning?

306

What happens when the node running the map task fails before the map output has been sent to the reducer?

613

Is it possible to share data files between different components?

When Namenode is down what happens to job tracker?

641

How do you specify the table creator name when creating a table in hive?

647

Can you explain benefits of spark over mapreduce?

266

Characterize data integrity? How does hdfs ensure information integrity of data blocks squares kept in hdfs?

In MapReduce how to change the name of the output file from part-r-00000?

602

What are the features of apache mahout?

On What concept the Hadoop framework works?

1155

What are the various types of shared variable in apache spark?

264

What is the use of tracing cqlsh command in Cassandra?

Discuss writeahead logging in Apache Spark Streaming?

305

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