[jira] [Commented] (SPARK-38230) InsertIntoHadoopFsRelationCommand unnecessarily fetches details of partitions in most cases

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-38230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677159#comment-17677159 ] 

Apache Spark commented on SPARK-38230:
--------------------------------------

User 'czxm' has created a pull request for this issue:
https://github.com/apache/spark/pull/39595

> InsertIntoHadoopFsRelationCommand unnecessarily fetches details of partitions in most cases
> -------------------------------------------------------------------------------------------
>
>                 Key: SPARK-38230
>                 URL: https://issues.apache.org/jira/browse/SPARK-38230
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.2
>            Reporter: Coal Chan
>            Priority: Major
>
> In `org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand`, `sparkSession.sessionState.catalog.listPartitions` will call method `org.apache.hadoop.hive.metastore.listPartitionsPsWithAuth` of hive metastore client, this method will produce multiple queries per partition on hive metastore db. So when you insert into a table which has too many partitions(ie: 10k), it will produce too many queries on hive metastore db(ie: n * 10k = 10nk), it puts a lot of strain on the database.
> In fact, it calls method `listPartitions` in order to get locations of partitions and get `customPartitionLocations`. But in most cases, we do not have custom partitions, we can just get partition names, so we can call method listPartitionNames.



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