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From Db-Blog <>
Subject Re: large small files vs one big file in hive table
Date Mon, 05 May 2014 22:38:04 GMT
In general it is recommended to have Millions of Large files rather than billions of small
files in hadoop. 

Please describe your issues in detail. Say for ex. 
-How are you planning to consume the data stored in this partition table?
- Are you looking for storage and performance optimizations? Etc. 


Sent from my iPhone, please avoid typos.

> On 05-May-2014, at 3:33 pm, Shushant Arora <> wrote:
> I have a hive table in which data is populated from RDBMS on daily basis.
> After map reduce each mapper write its data in hive table partitioned at month level.
> Issue is daily when job runs it fetches data of last day and each mapper writes its output
in seperate file. Shall I merge those files in single one ?
> What should be file format? Sequence file or text is better ?

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