How Do I Merge Small Files?

Updated on 2023-03-21 GMT+08:00

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If a large number of small files are generated during SQL execution, job execution and table query will take a long time. In this case, you should merge small files.

Set the configuration item as follows:
spark.sql.shuffle.partitions = Number of partitions (number of the generated small files in this case)

Execute the following SQL statements:

INSERT OVERWRITE TABLE tablename
select  * FROM  tablename distribute by rand()

Parent topic: Job Development

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