Clean up shard data when dropping retention policies

CHANGELOG.md

@@ -14,8 +14,8 @@
 - [#5666](https://github.com/influxdata/influxdb/pull/5666): Manage dependencies with gdm
 - [#5512](https://github.com/influxdata/influxdb/pull/5512): HTTP: Add config option to enable HTTP JSON write path which is now disabled by default.
 - [#5336](https://github.com/influxdata/influxdb/pull/5366): Enabled golint for influxql. @gabelev
-- [#5706](https://github.com/influxdata/influxdb/pull/5706): Cluster setup
-cleanup
+- [#5706](https://github.com/influxdata/influxdb/pull/5706): Cluster setup cleanup
+- [#5691](https://github.com/influxdata/influxdb/pull/5691): Remove associated shard data when retention policies are dropped.
 
 ### Bugfixes
 

cluster/query_executor.go

@@ -293,24 +293,29 @@ func (e *QueryExecutor) executeDropDatabaseStatement(stmt *influxql.DropDatabase
 		return err
 	}
 
-	// Retrieve a list of all shard ids.
-	var shardIDs []uint64
-	for _, rp := range dbi.RetentionPolicies {
-		for _, sg := range rp.ShardGroups {
-			for _, s := range sg.Shards {
-				shardIDs = append(shardIDs, s.ID)
-			}
-		}
-	}
-
 	// Remove the database from the local store
-	if err := e.TSDBStore.DeleteDatabase(stmt.Name, shardIDs); err != nil {
+	if err := e.TSDBStore.DeleteDatabase(stmt.Name); err != nil {
 		return err
 	}
 
 	return nil
 }
 
+// executeDropRetentionPolicy closes all local shards for the retention
+// policy and removes the directory.
+func (q *QueryExecutor) executeDropRetentionPolicy(stmt *influxql.DropRetentionPolicyStatement) error {
+	// Check if the database and retention policy exist.
+	if _, err := q.MetaClient.RetentionPolicy(stmt.Database, stmt.Name); err != nil {
+		return err
+	}
+
+	// Remove the retention policy from the local store.
+	if err := q.TSDBStore.DeleteRetentionPolicy(stmt.Database, stmt.Name); err != nil {
+		return err
+	}
+	return q.MetaClient.DropRetentionPolicy(stmt.Database, stmt.Name)
+}
+
 func (e *QueryExecutor) executeDropMeasurementStatement(stmt *influxql.DropMeasurementStatement, database string) error {
 	return e.TSDBStore.DeleteMeasurement(database, stmt.Name)
 }

services/meta/client.go

@@ -412,7 +412,7 @@ func (c *Client) RetentionPolicy(database, name string) (rpi *RetentionPolicyInf
 
 	// TODO: This should not be handled here
 	if db == nil {
-		return nil, ErrDatabaseNotExists
+		return nil, influxdb.ErrDatabaseNotFound(database)
 	}
 
 	return db.RetentionPolicy(name), nil