COMPACTION

Function

This command is used to convert row-based log files in MOR tables into column-based data files in parquet tables, accelerating record search.

Syntax

SCHEDULE COMPACTION on tableIdentifier |tablelocation;

SHOW COMPACTION on tableIdentifier |tablelocation;

RUN COMPACTION on tableIdentifier |tablelocation [at instant-time];

Parameter Description

**Table 1** Parameters
Parameter	Description
tableIdentifier	Name of the Hudi table to convert log files.
tablelocation	Storage path of the Hudi table.
instant-time	Time to run the command. You can run the show compaction command to view the instant-time value.

Examples

schedule compaction  on h1;
show compaction on h1;
run compaction on h1 at 20210915170758;

schedule compaction  on '/tmp/hudi/h1';
run compaction on '/tmp/hudi/h1';

Precautions

You need to set hoodie.payload.ordering.field to the value of preCombineField when you use the Hudi CLI or API to trigger compaction for the Hudi table created by SQL.