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https://issues.apache.org/jira/browse/SPARK-38230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493790#comment-17493790
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Apache Spark commented on SPARK-38230:
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User 'coalchan' has created a pull request for this issue:
https://github.com/apache/spark/pull/35549
> 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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