wyb opened a new pull request #3418:
URL: https://github.com/apache/incubator-doris/pull/3418
Spark clusters are used to preprocess data (partition, sort, aggregation) in
spark load, and should be managed by Doris.
Spark load documentation:
docs/documentation/cn/administrator-guide/load-data/spark-load-manual.md
1. add spark cluster
```sql
ALTER SYSTEM ADD LOAD CLUSTER cluster_name
PROPERTIES("key1" = "value1", ...)
```
2. drop spark cluster
```sql
ALTER SYSTEM DROP LOAD CLUSTER cluster_name
```
3. show spark cluster
```sql
SHOW LOAD CLUSTERS
SHOW PROC "/load_etl_clusters"
```
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