You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@spark.apache.org by "Rajesh Balamohan (Jira)" <ji...@apache.org> on 2020/07/08 08:56:00 UTC

[jira] [Created] (SPARK-32225) Parquet footer information is read twice

Rajesh Balamohan created SPARK-32225:
----------------------------------------

             Summary: Parquet footer information is read twice
                 Key: SPARK-32225
                 URL: https://issues.apache.org/jira/browse/SPARK-32225
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Rajesh Balamohan
         Attachments: spark_parquet_footer_reads.png

When running queries, spark reads parquet footer information twice. In cloud env, this would turn out to be expensive (depending on the jobs, # of splits). It would be nice to reuse the footer information already read via "ParquetInputFormat::buildReaderWithPartitionValues"

 

!image-2020-07-08-14-24-23-470.png|width=726,height=730!

Lines of interest:

[https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala#L271]


[https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala#L326]

 

[https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/SpecificParquetRecordReaderBase.java#L105]


[https://github.com/apache/spark/blob/master/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/SpecificParquetRecordReaderBase.java#L111]

 



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org