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

Apache Impala Interview Questions

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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?

Can I do transforms or add new functionality?

Why is space not freed up when I issue drop table?

Is avro supported?

Un-Answered Questions { Apache Impala }

What are impala built-in functions?

What are the differences between relational databases and impala?

Does impala use caching?

What are the names of daemons in impala?

Is hive an impala requirement?

How are joins performed in impala?

Does impala support generic jdbc?

What is troubleshooting for impala?

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

Does if offer scaling?

What impala use for authentication?

What is the maximum number of rows in a table?

How can it help for avoiding costly modeling?

Describe impala shell (impala-shell command)?

When does impala hold on to or return memory?

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