sqoop interview questions - Wikitechy https://www.wikitechy.com/interview-questions/tag/sqoop-interview-questions/ Interview Questions Mon, 13 Sep 2021 05:56:54 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png sqoop interview questions - Wikitechy https://www.wikitechy.com/interview-questions/tag/sqoop-interview-questions/ 32 32 What is sqoop metastore ? https://www.wikitechy.com/interview-questions/sqoop/what-is-sqoop-metastore/ https://www.wikitechy.com/interview-questions/sqoop/what-is-sqoop-metastore/#respond Thu, 22 Jul 2021 06:47:16 +0000 https://www.wikitechy.com/interview-questions/?p=1198

Sqoop Metastore:

  • Sqoop metastore is an internally implemented database that can hold the definition of a given job.
  • It includes details like which database,which table,which approach,what query to extract from,what target to write to and so on.
  • Consider an array of SQL databases that have the same structure, but are partitioned by for performance reasons.
  • Thus we have the same sqoop job running against multiple database instances at the same time, all unified at a single table in Hadoop.
  • In order to get parallelization, we generate a job that manages the Sqoop sub-workflows. This results in 500 distinct sqoop jobs.
  • Metastore is used to handle these complexities.
overview of sqoop metastore
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Sqoop:

Sqoop Tutorial
  • Apache Sqoop is efficiently transferring data between Relational databases and Apache Hadoop.
  • It is used to import data from relational databases such as MySQL, Oracle to Hadoop HDFS, and export from Hadoop file system to relational databases.
  • It improves the efficiency of data analysis by combining structured data and unstructured data.
  • Sqoop stands for SQL for Hadoop.SQL + HADOOP =SQOOP
Overview Of Sqoop Diagram

]]> https://www.wikitechy.com/interview-questions/sqoop/what-is-sqoop/feed/ 0 What is the Difference between apache hive and impala ? https://www.wikitechy.com/interview-questions/hive/what-is-the-difference-between-apache-hive-and-impala/ https://www.wikitechy.com/interview-questions/hive/what-is-the-difference-between-apache-hive-and-impala/#respond Tue, 13 Jul 2021 22:18:19 +0000 https://www.wikitechy.com/interview-questions/?p=598 Apache hive Vs Impala
Apache hive Impala
Hive generates query expressions at compile
time;Hive is batch based Hadoop MapReduce		 Impala does not support for complex types
and fault tolerance.
Apache does not generations runtime code
for “big loops ” using llvm.		 Impala does generations runtime code
for “big loops ” using llvm.
Hadoop 2.7.3 Hadoop 2.6.0
All queries run through LLAP Runtime Filtering Optimization Enabled
ORCFile format with zlib compression Parquet format with snappy compression
Every hive query has this problem of “cold start”. Impala avoids startup overhead as daemon
processes are started at boot time itself,
always being ready to processes a query.
Apache Hive might not be ideal for interactive computing Impala is meant for interactive computing.
Hive is batch based Hadoop MapReduce. Impala is more like MPP database.
Hive supports complex types. Impala does not support complex types.
Apache Hive is fault tolerant. Impala does not support fault tolerance.
It is more universal, versatile and pluggable language. It is used unleash its brute processing power
and give lightning fast analytic results.
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Hive server

  • HiveServer – It allows a remote client to submit requests to Hive, using a programming languages, and results.
  • Hive server2 – It interface that enables remote clients to execute queries against Hive and results.
What is hive Server in hive

How does hive server works ?

  • It provide service to allows a remote client which using different kinds of programming languages, and retrieve results.
  • The current implementation, based on RPC(Remote Procedure Call), improved version of hive server and supports multi-client and Authentication.
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