What is a checkpoint?Hadoop interview question set 2/Apache Hadoop Interview Questions and Answers for Freshers & Experienced

What is a checkpoint?

In brief, “Checkpointing” is a process that takes an FsImage, edit log and compacts them into a new FsImage. Thus, instead of replaying an edit log, the NameNode can load the final in-memory state directly from the FsImage. This is a far more efficient operation and reduces NameNode startup time. Checkpointing is performed by Secondary NameNode.

Posted Date:- 2021-08-31 05:58:34

How to use Apache Zookeeper command line interface?

Explain about ZooKeeper in Kafka

Does Apache Flume provide support for third party plug-ins?

How multi-hop agent can be setup in Flume?

What are the differences between Pig and SQL?

Explain Grunt Shell.

How do you configure an “Oozie” job in Hadoop?

Define RDD.

What are the components of Region Server?

Can the default “Hive Metastore” be used by multiple users (processes) at the same time?

What is a UDF?

What are the different data types in Pig Latin?

What do you know about “SequenceFileInputFormat”?

What is a “Combiner”?

Does Flume provide 100% reliability to the data flow?

What are the limitations of importing RDBMS tables into Hcatalog directly?

Can free form SQL queries be used with Sqoop import command? If yes, then how can they be used?

How are large objects handled in Sqoop?

What is the standard location or path for Hadoop Sqoop scripts?

Is it possible to do an incremental import using Sqoop?

Explain “Distributed Cache” in a “MapReduce Framework”.

What is the purpose of “RecordReader” in Hadoop?

State some key components of ZooKeeper.

What is an interceptor?

What do you know about Sqoop metastore?

How to import BLOB and CLOB-like big objects in Sqoop?

Mention the consequences of Distributed Applications.

What is Apache Flume in Hadoop ?

How can I restart “NameNode” or all the daemons in Hadoop?

What is “speculative execution” in Hadoop?

How do you define “Rack Awareness” in Hadoop?

What does ‘jps’ command do?

Why do we use HDFS for applications having large data sets and not when there are a lot of small files?

Can NameNode and DataNode be a commodity hardware?

How is HDFS fault tolerant?

What applications are supported by Apache Hive?

Explain the process of row deletion in HBase.

What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

Explain about the different catalog tables in HBase?

Explain the three types of tombstone markers for deletion.

What is a checkpoint?

Give a brief on how Spark is good at low latency workloads like graph processing and Machine Learning.

What are the basic parameters of a mapper?

Explain the distributed Cache in MapReduce framework.

Explain the difference between RDBMS data model and HBase data model.

What is Row Key?

What are the different operational commands in HBase at record level and table level?

Explain the actions followed by a Jobtracker in Hadoop.

How does NameNode tackle DataNode failures?

What happens when two clients try to access the same file in the HDFS?

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