ShuMing Li created CARBONDATA-3698:
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Summary: Drop table will iterate all databases and tables
Key: CARBONDATA-3698
URL:
https://issues.apache.org/jira/browse/CARBONDATA-3698 Project: CarbonData
Issue Type: Bug
Components: sql
Affects Versions: 1.6.1
Reporter: ShuMing Li
When executes `drop table carbon_table_xxx`, it costs huge time if there are a lot of tables in the warehouse.
Here is TraceStack:
```
{{ - locked <0x00000006dd91f450> (a org.apache.spark.sql.hive.HiveExternalCatalog)
at org.apache.spark.sql.hive.HiveExternalCatalog.listTables(HiveExternalCatalog.scala:869)
at org.apache.spark.sql.catalyst.catalog.SessionCatalog.listTables(SessionCatalog.scala:811)
at org.apache.spark.sql.catalyst.catalog.SessionCatalog.listTables(SessionCatalog.scala:795)
at org.apache.spark.sql.hive.CarbonFileMetastore$$anonfun$4.apply(CarbonFileMetastore.scala:585)
at org.apache.spark.sql.hive.CarbonFileMetastore$$anonfun$4.apply(CarbonFileMetastore.scala:584)
at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
at scala.collection.Iterator$class.foreach(Iterator.scala:893)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
at scala.collection.AbstractTraversable.flatMap(Traversable.scala:104)
at org.apache.spark.sql.hive.CarbonFileMetastore.removeStaleTimeStampEntries(CarbonFileMetastore.scala:583)
at org.apache.spark.sql.execution.command.table.CarbonDropTableCommand.processMetadata(CarbonDropTableCommand.scala:192)
at org.apache.spark.sql.execution.command.AtomicRunnableCommand$$anonfun$run$3.apply(package.scala:146)
at org.apache.spark.sql.execution.command.AtomicRunnableCommand$$anonfun$run$3.apply(package.scala:145)
at org.apache.spark.sql.execution.command.Auditable$class.runWithAudit(package.scala:104)}}
```
Here is code which iterates tables:
```
def removeStaleTimeStampEntries(sparkSession: SparkSession): Unit = {
val tablesList = sparkSession.sessionState.catalog.listDatabases().flatMap {
database =>
sparkSession.sessionState.catalog.listTables(database)
.map(table => CarbonTable.buildUniqueName(database, table.table))
}
...
}
```
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