Coal Chan created SPARK-38230:
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Summary: 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
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 on hive
metastore db. 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, so we can just get partition names.
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