[CARBONDATA-3699] Drop table will iterate all databases and tables

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.6.1
• Component/s: sql
• Assignee: Unassigned
• Reporter: ShuMing Li
• Created: 13/Feb/20 07:01
• Updated: 13/Feb/20 07:01

Description

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))   }

 ...
}

```