[GitHub] [spark] LuciferYang edited a comment on pull request #30483: [SPARK-33449][SQL] Add File Metadata cache support for Parquet and Orc

Wed, 03 Feb 2021 01:28:38 -0800 


LuciferYang edited a comment on pull request #30483:
URL: https://github.com/apache/spark/pull/30483#issuecomment-772273452


   Simple test:
   ```
   val df = spark.read.parquet(or orc)("/xxx/data")
   
   df.createOrReplaceTempView("test_table")
   
   spark.sql("select sum(a), sum(b), sum(c) from test_table where id = 
1381339").show
   spark.sql("select sum(a), sum(b), sum(c) from test_table where id = 
28643411").show
   ```
   
   Data Source V1:
   
   1.  parquet with `spark.sql.fileMetaCache.parquet.enabled =false`
   
   **Each footer was read 4 times, both queries read 6.9m data.**
   
   
![image](https://user-images.githubusercontent.com/1475305/106707904-faf6bb00-662c-11eb-8ce8-5492af5b3528.png)
   
![image](https://user-images.githubusercontent.com/1475305/106707931-0ba73100-662d-11eb-8080-cf8885852e3c.png)
   
   2. parquet with `spark.sql.fileMetaCache.parquet.enabled =true` 
   
   **Each footer was read 1 times, 1st query read 5m data and 2nd query read 3m 
data.**
   
   
![image](https://user-images.githubusercontent.com/1475305/106707982-1e216a80-662d-11eb-9832-66728312ac08.png)
   
![image](https://user-images.githubusercontent.com/1475305/106708048-385b4880-662d-11eb-8cca-2b0e4029affa.png)
   
   
   3. orc with `spark.sql.fileMetaCache.orc.enabled =false`
   
   **Each footer was read 4 times, both queries read 52.3m data.**
   
   
![image](https://user-images.githubusercontent.com/1475305/106708161-5d4fbb80-662d-11eb-81df-656f9be55475.png)
   
![image](https://user-images.githubusercontent.com/1475305/106708209-70628b80-662d-11eb-93cd-a3cacca8f667.png)
   
   4. orc with `spark.sql.fileMetaCache.orc.enabled =true`
   
   **Each footer was read 1 times, 1st query read 45.5m data and 2nd query read 
38.7m data.**
   
   
![image](https://user-images.githubusercontent.com/1475305/106708235-7ce6e400-662d-11eb-861c-d8a26a247623.png)
   
![image](https://user-images.githubusercontent.com/1475305/106708265-85d7b580-662d-11eb-899e-2155104a9427.png)
   
   
   DataSource V2 API has similar results.
   
   


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