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Difference between mr and Tez?

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What are the differences between mr mode and tez.

Why tez functions faster than mr?

why few queries fail in tez but gets executed successfully in mr mode?

I know the question I ask have multiple answers but I just wanted to know all the possible scenarios. Thanks

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Contributor

Hi @Bala Vignesh N V

Here are some links that you can go though to understand differences between MR and Tez.

Difference between MR and Tez & Why Tez is faster?

http://hortonworks.com/apache/tez/#section_2

https://cwiki.apache.org/confluence/display/Hive/Hive+on+Tez

http://www.slideshare.net/Hadoop_Summit/w-235phall1pandey (See slides 9 to 16)

why job fails in tez but runs in MR?

There could be several reasons for the jobs failure. It could be because of OOM exceptions when memory is not tuned correctly (refer: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.4/bk_installing_manually_book/content/determi.... I have also seen cases where job fails in MR but runs fine when Tez execution engine is used.

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spot on @mqureshi. Thanks it helps !!

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Super Guru

@Bala Vignesh N V

Glad, it was helpful. If you think its a complete answer you were looking for, please accept the answer.

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New Contributor

"I highly recommend skimming quickly over following slides, specially starting from slide 7.

http://www.slideshare.net/Hadoop_Summit/w-235phall1pandey"

 

This slide is not there at the path

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Explorer

If the table is partitioned and there are delta files (from updates, for eg.), I think mr works but not tez. You may have to run compaction to convert the delta files into base files and then tez will work.