LantaoJin commented on a change in pull request #28938:
URL: https://github.com/apache/spark/pull/28938#discussion_r448086615
##########
File path:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala
##########
@@ -213,23 +234,23 @@ private[spark] class HiveExternalCatalog(conf: SparkConf,
hadoopConf: Configurat
client.alterDatabase(dbDefinition)
}
- override def getDatabase(db: String): CatalogDatabase = withClient {
+ override def getDatabase(db: String): CatalogDatabase = withClient(db) {
client.getDatabase(db)
}
- override def databaseExists(db: String): Boolean = withClient {
+ override def databaseExists(db: String): Boolean = withClient(db) {
client.databaseExists(db)
}
- override def listDatabases(): Seq[String] = withClient {
+ override def listDatabases(): Seq[String] = withClient() {
Review comment:
I think we don't need a global lock for `listDatabases`. There are two
reasons. First is these are just read operations, no critical problems except
getting dirty databases list. Second, the underlay store of HiveMetastore such
as MYSQL has locks itself.
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