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doc: Update README.md with shuffle configs #208

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Mar 14, 2024
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doc: Update README.md with shuffle configs #208

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doc: Update README.md with shuffle configs
viirya Mar 14, 2024
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Update README.md
viirya Mar 14, 2024
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19 changes: 18 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -113,4 +113,21 @@ INFO src/lib.rs: Comet native library initialized
+- CometScan parquet [a#14] Batched: true, DataFilters: [isnotnull(a#14), (a#14 > 5)],
Format: CometParquet, Location: InMemoryFileIndex(1 paths)[file:/tmp/test], PartitionFilters: [],
PushedFilters: [IsNotNull(a), GreaterThan(a,5)], ReadSchema: struct<a:int>
```
```

### Enable Comet shuffle

Comet shuffle feature is disabled by default. To enable it, please add related configs:

```
--conf spark.shuffle.manager=org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager
--conf spark.comet.exec.shuffle.enabled=true
```

Above configs enable Comet native shuffle which only supports hash partiting and single partition.
Comet native shuffle doesn't support complext types yet.

To enable columnar shuffle which supports all partitioning and basic complex types, one more config is required:
```
--conf spark.comet.columnar.shuffle.enabled=true
```