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hvanhovell pushed a commit to branch branch-3.5
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The following commit(s) were added to refs/heads/branch-3.5 by this push:
new d18305d5e93 [SPARK-44656][CONNECT] Make all iterators
CloseableIterators
d18305d5e93 is described below
commit d18305d5e9312a438317b9b2ff800f2c074e3917
Author: Juliusz Sompolski <ju...@databricks.com>
AuthorDate: Fri Aug 4 16:06:57 2023 +0200
[SPARK-44656][CONNECT] Make all iterators CloseableIterators
### What changes were proposed in this pull request?
This makes sure that all iterators used in Spark Connect scala client are
`CloseableIterator`.
1. Makes `CustomSparkConnectBlockingStub.executePlan` return
`CloseableIterator` and make all wrappers respect that.
2. Makes `ExecutePlanResponseReattachableIterator` a `CloseableIterator`,
with an implementation that will inform the server that query result can be
released with ReleaseExecute.
3. Makes `SparkResult.iterator` explicitly a `CloseableIterator`, and also
register the `SparkResult.responses` iterator as with the
`SparkResultCloseable` cleaner, which will make it close upon GC, if not closed
explicitly sooner.
4. Because `Dataset.toLocalIterator` requires a Java iterator, implement a
conversion to `java.util.Iterator with AutoCloseable` to be returned there
5. Using `CloseableIterator` consistently everywhere else removes the need
to convert between iterator types.
### Why are the changes needed?
Properly closeable iterators are needed for resource management, and with
reattachable execution to inform server that processing finished.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Exercise current E2E tests.
Co-authored-by: Alice Sayutina <alice.sayutinadatabricks.com>
Closes #42331 from juliuszsompolski/closeable_iterators.
Lead-authored-by: Juliusz Sompolski <ju...@databricks.com>
Co-authored-by: Alice Sayutina <alice.sayut...@databricks.com>
Signed-off-by: Herman van Hovell <her...@databricks.com>
(cherry picked from commit 84ea6f242e4982187edc0a8f5786e7dc69ec31d7)
Signed-off-by: Herman van Hovell <her...@databricks.com>
---
.../main/scala/org/apache/spark/sql/Dataset.scala | 4 +-
.../scala/org/apache/spark/sql/SparkSession.scala | 21 ++++------
.../sql/connect/client/CloseableIterator.scala | 46 ++++++++++++++++++++++
.../client/CustomSparkConnectBlockingStub.scala | 10 +++--
.../ExecutePlanResponseReattachableIterator.scala | 34 +++++++++-------
.../connect/client/GrpcExceptionConverter.scala | 10 ++++-
.../sql/connect/client/GrpcRetryHandler.scala | 24 ++++++-----
.../sql/connect/client/SparkConnectClient.scala | 7 ++--
.../spark/sql/connect/client/SparkResult.scala | 37 +++++++++--------
.../connect/client/arrow/ArrowDeserializer.scala | 1 +
.../connect/client/arrow/ArrowEncoderUtils.scala | 2 -
.../sql/connect/client/arrow/ArrowSerializer.scala | 1 +
.../org/apache/spark/sql/ClientE2ETestSuite.scala | 2 +-
.../connect/client/arrow/ArrowEncoderSuite.scala | 1 +
14 files changed, 133 insertions(+), 67 deletions(-)
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/Dataset.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/Dataset.scala
index 0f7b376955c..8a7dce3987a 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/Dataset.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/Dataset.scala
@@ -2832,7 +2832,7 @@ class Dataset[T] private[sql] (
/**
* Returns an iterator that contains all rows in this Dataset.
*
- * The returned iterator implements [[AutoCloseable]]. For memory management
it is better to
+ * The returned iterator implements [[AutoCloseable]]. For resource
management it is better to
* close it once you are done. If you don't close it, it and the underlying
data will be cleaned
* up once the iterator is garbage collected.
*
@@ -2840,7 +2840,7 @@ class Dataset[T] private[sql] (
* @since 3.4.0
*/
def toLocalIterator(): java.util.Iterator[T] = {
- collectResult().destructiveIterator
+ collectResult().destructiveIterator.asJava
}
/**
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/SparkSession.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/SparkSession.scala
index 59f3f3526ab..355d7edadc7 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/SparkSession.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/SparkSession.scala
@@ -252,10 +252,8 @@ class SparkSession private[sql] (
.setSql(sqlText)
.addAllPosArgs(args.map(toLiteralProto).toIterable.asJava)))
val plan = proto.Plan.newBuilder().setCommand(cmd)
- val responseSeq = client.execute(plan.build()).asScala.toSeq
-
- // sequence is a lazy stream, force materialize it to make sure it is
consumed.
- responseSeq.foreach(_ => ())
+ // .toBuffer forces that the iterator is consumed and closed
+ val responseSeq = client.execute(plan.build()).toBuffer.toSeq
val response = responseSeq
.find(_.hasSqlCommandResult)
@@ -311,10 +309,8 @@ class SparkSession private[sql] (
.setSql(sqlText)
.putAllArgs(args.asScala.mapValues(toLiteralProto).toMap.asJava)))
val plan = proto.Plan.newBuilder().setCommand(cmd)
- val responseSeq = client.execute(plan.build()).asScala.toSeq
-
- // sequence is a lazy stream, force materialize it to make sure it is
consumed.
- responseSeq.foreach(_ => ())
+ // .toBuffer forces that the iterator is consumed and closed
+ val responseSeq = client.execute(plan.build()).toBuffer.toSeq
val response = responseSeq
.find(_.hasSqlCommandResult)
@@ -548,15 +544,14 @@ class SparkSession private[sql] (
f(builder)
builder.getCommonBuilder.setPlanId(planIdGenerator.getAndIncrement())
val plan = proto.Plan.newBuilder().setRoot(builder).build()
- client.execute(plan).asScala.foreach(_ => ())
+ // .toBuffer forces that the iterator is consumed and closed
+ client.execute(plan).toBuffer
}
private[sql] def execute(command: proto.Command): Seq[ExecutePlanResponse] =
{
val plan = proto.Plan.newBuilder().setCommand(command).build()
- val seq = client.execute(plan).asScala.toSeq
- // sequence is a lazy stream, force materialize it to make sure it is
consumed.
- seq.foreach(_ => ())
- seq
+ // .toBuffer forces that the iterator is consumed and closed
+ client.execute(plan).toBuffer.toSeq
}
private[sql] def registerUdf(udf: proto.CommonInlineUserDefinedFunction):
Unit = {
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
new file mode 100644
index 00000000000..891e50ed6e7
--- /dev/null
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.connect.client
+
+private[sql] trait CloseableIterator[E] extends Iterator[E] with AutoCloseable
{ self =>
+ def asJava: java.util.Iterator[E] = new java.util.Iterator[E] with
AutoCloseable {
+ override def next() = self.next()
+
+ override def hasNext() = self.hasNext
+
+ override def close() = self.close()
+ }
+}
+
+private[sql] object CloseableIterator {
+
+ /**
+ * Wrap iterator to get CloseeableIterator, if it wasn't closeable already.
+ */
+ def apply[T](iterator: Iterator[T]): CloseableIterator[T] = iterator match {
+ case closeable: CloseableIterator[T] => closeable
+ case _ =>
+ new CloseableIterator[T] {
+ override def next(): T = iterator.next()
+
+ override def hasNext(): Boolean = iterator.hasNext
+
+ override def close() = { /* empty */ }
+ }
+ }
+}
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CustomSparkConnectBlockingStub.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CustomSparkConnectBlockingStub.scala
index bb20901eade..73ff01e223f 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CustomSparkConnectBlockingStub.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/CustomSparkConnectBlockingStub.scala
@@ -16,6 +16,8 @@
*/
package org.apache.spark.sql.connect.client
+import scala.collection.JavaConverters._
+
import io.grpc.ManagedChannel
import org.apache.spark.connect.proto._
@@ -27,15 +29,17 @@ private[client] class CustomSparkConnectBlockingStub(
private val stub = SparkConnectServiceGrpc.newBlockingStub(channel)
private val retryHandler = new GrpcRetryHandler(retryPolicy)
- def executePlan(request: ExecutePlanRequest):
java.util.Iterator[ExecutePlanResponse] = {
+ def executePlan(request: ExecutePlanRequest):
CloseableIterator[ExecutePlanResponse] = {
GrpcExceptionConverter.convert {
GrpcExceptionConverter.convertIterator[ExecutePlanResponse](
- retryHandler.RetryIterator(request, stub.executePlan))
+ retryHandler.RetryIterator[ExecutePlanRequest, ExecutePlanResponse](
+ request,
+ r => CloseableIterator(stub.executePlan(r).asScala)))
}
}
def executePlanReattachable(
- request: ExecutePlanRequest): java.util.Iterator[ExecutePlanResponse] = {
+ request: ExecutePlanRequest): CloseableIterator[ExecutePlanResponse] = {
GrpcExceptionConverter.convert {
GrpcExceptionConverter.convertIterator[ExecutePlanResponse](
// Don't use retryHandler - own retry handling is inside.
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/ExecutePlanResponseReattachableIterator.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/ExecutePlanResponseReattachableIterator.scala
index 41648c3c100..d412d9b5770 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/ExecutePlanResponseReattachableIterator.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/ExecutePlanResponseReattachableIterator.scala
@@ -50,7 +50,7 @@ class ExecutePlanResponseReattachableIterator(
request: proto.ExecutePlanRequest,
channel: ManagedChannel,
retryPolicy: GrpcRetryHandler.RetryPolicy)
- extends java.util.Iterator[proto.ExecutePlanResponse]
+ extends CloseableIterator[proto.ExecutePlanResponse]
with Logging {
val operationId = if (request.hasOperationId) {
@@ -90,8 +90,8 @@ class ExecutePlanResponseReattachableIterator(
// Initial iterator comes from ExecutePlan request.
// Note: This is not retried, because no error would ever be thrown here,
and GRPC will only
- // throw error on first iterator.hasNext() or iterator.next()
- private var iterator: java.util.Iterator[proto.ExecutePlanResponse] =
+ // throw error on first iter.hasNext() or iter.next()
+ private var iter: java.util.Iterator[proto.ExecutePlanResponse] =
rawBlockingStub.executePlan(initialRequest)
override def next(): proto.ExecutePlanResponse = synchronized {
@@ -105,11 +105,11 @@ class ExecutePlanResponseReattachableIterator(
var firstTry = true
val ret = retry {
if (firstTry) {
- // on first try, we use the existing iterator.
+ // on first try, we use the existing iter.
firstTry = false
} else {
- // on retry, the iterator is borked, so we need a new one
- iterator =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
+ // on retry, the iter is borked, so we need a new one
+ iter =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
}
callIter(_.next())
}
@@ -138,23 +138,23 @@ class ExecutePlanResponseReattachableIterator(
try {
retry {
if (firstTry) {
- // on first try, we use the existing iterator.
+ // on first try, we use the existing iter.
firstTry = false
} else {
- // on retry, the iterator is borked, so we need a new one
- iterator =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
+ // on retry, the iter is borked, so we need a new one
+ iter =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
}
var hasNext = callIter(_.hasNext())
// Graceful reattach:
- // If iterator ended, but there was no ResultComplete, it means that
there is more,
+ // If iter ended, but there was no ResultComplete, it means that there
is more,
// and we need to reattach.
if (!hasNext && !resultComplete) {
do {
- iterator =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
+ iter =
rawBlockingStub.reattachExecute(createReattachExecuteRequest())
assert(!resultComplete) // shouldn't change...
hasNext = callIter(_.hasNext())
- // It's possible that the new iterator will be empty, so we need
to loop to get another.
- // Eventually, there will be a non empty iterator, because there
is always a
+ // It's possible that the new iter will be empty, so we need to
loop to get another.
+ // Eventually, there will be a non empty iter, because there is
always a
// ResultComplete inserted by the server at the end of the stream.
} while (!hasNext)
}
@@ -167,6 +167,10 @@ class ExecutePlanResponseReattachableIterator(
}
}
+ override def close(): Unit = {
+ releaseAll()
+ }
+
/**
* Inform the server to release the buffered execution results until and
including given result.
*
@@ -204,7 +208,7 @@ class ExecutePlanResponseReattachableIterator(
*/
private def callIter[V](iterFun:
java.util.Iterator[proto.ExecutePlanResponse] => V) = {
try {
- iterFun(iterator)
+ iterFun(iter)
} catch {
case ex: StatusRuntimeException
if StatusProto
@@ -217,7 +221,7 @@ class ExecutePlanResponseReattachableIterator(
ex)
}
// Try a new ExecutePlan, and throw upstream for retry.
- iterator = rawBlockingStub.executePlan(initialRequest)
+ iter = rawBlockingStub.executePlan(initialRequest)
throw new GrpcRetryHandler.RetryException
}
}
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcExceptionConverter.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcExceptionConverter.scala
index 1a42ec821d8..7ff3421a5a0 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcExceptionConverter.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcExceptionConverter.scala
@@ -31,8 +31,8 @@ private[client] object GrpcExceptionConverter {
}
}
- def convertIterator[T](iter: java.util.Iterator[T]): java.util.Iterator[T] =
{
- new java.util.Iterator[T] {
+ def convertIterator[T](iter: CloseableIterator[T]): CloseableIterator[T] = {
+ new CloseableIterator[T] {
override def hasNext: Boolean = {
convert {
iter.hasNext
@@ -44,6 +44,12 @@ private[client] object GrpcExceptionConverter {
iter.next()
}
}
+
+ override def close(): Unit = {
+ convert {
+ iter.close()
+ }
+ }
}
}
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcRetryHandler.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcRetryHandler.scala
index 47ff975b267..6dad5b4b3a9 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcRetryHandler.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/GrpcRetryHandler.scala
@@ -45,13 +45,13 @@ private[client] class GrpcRetryHandler(private val
retryPolicy: GrpcRetryHandler
* @tparam U
* The type of the response.
*/
- class RetryIterator[T, U](request: T, call: T => java.util.Iterator[U])
- extends java.util.Iterator[U] {
+ class RetryIterator[T, U](request: T, call: T => CloseableIterator[U])
+ extends CloseableIterator[U] {
private var opened = false // we only retry if it fails on first call when
using the iterator
- private var iterator = call(request)
+ private var iter = call(request)
- private def retryIter[V](f: java.util.Iterator[U] => V) = {
+ private def retryIter[V](f: Iterator[U] => V) = {
if (!opened) {
opened = true
var firstTry = true
@@ -61,26 +61,30 @@ private[client] class GrpcRetryHandler(private val
retryPolicy: GrpcRetryHandler
firstTry = false
} else {
// on retry, we need to call the RPC again.
- iterator = call(request)
+ iter = call(request)
}
- f(iterator)
+ f(iter)
}
} else {
- f(iterator)
+ f(iter)
}
}
override def next: U = {
- retryIter(_.next())
+ retryIter(_.next)
}
override def hasNext: Boolean = {
- retryIter(_.hasNext())
+ retryIter(_.hasNext)
+ }
+
+ override def close(): Unit = {
+ iter.close()
}
}
object RetryIterator {
- def apply[T, U](request: T, call: T => java.util.Iterator[U]):
RetryIterator[T, U] =
+ def apply[T, U](request: T, call: T => CloseableIterator[U]):
RetryIterator[T, U] =
new RetryIterator(request, call)
}
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkConnectClient.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkConnectClient.scala
index 3d20be88888..a028df536cf 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkConnectClient.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkConnectClient.scala
@@ -75,10 +75,11 @@ private[sql] class SparkConnectClient(
/**
* Execute the plan and return response iterator.
*
- * It returns an open iterator. The caller needs to ensure that this
iterator is fully consumed,
- * otherwise resources held by a re-attachable query may be left dangling
until server timeout.
+ * It returns CloseableIterator. For resource management it is better to
close it once you are
+ * done. If you don't close it, it and the underlying data will be cleaned
up once the iterator
+ * is garbage collected.
*/
- def execute(plan: proto.Plan): java.util.Iterator[proto.ExecutePlanResponse]
= {
+ def execute(plan: proto.Plan): CloseableIterator[proto.ExecutePlanResponse]
= {
artifactManager.uploadAllClassFileArtifacts()
val request = proto.ExecutePlanRequest
.newBuilder()
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkResult.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkResult.scala
index 93c32aa2954..609e84779fb 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkResult.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/SparkResult.scala
@@ -27,14 +27,14 @@ import org.apache.arrow.vector.types.pojo
import org.apache.spark.connect.proto
import org.apache.spark.sql.catalyst.encoders.{AgnosticEncoder, RowEncoder}
import
org.apache.spark.sql.catalyst.encoders.AgnosticEncoders.{ProductEncoder,
UnboundRowEncoder}
-import org.apache.spark.sql.connect.client.arrow.{AbstractMessageIterator,
ArrowDeserializingIterator, CloseableIterator, ConcatenatingArrowStreamReader,
MessageIterator}
+import org.apache.spark.sql.connect.client.arrow.{AbstractMessageIterator,
ArrowDeserializingIterator, ConcatenatingArrowStreamReader, MessageIterator}
import org.apache.spark.sql.connect.client.util.Cleanable
import org.apache.spark.sql.connect.common.DataTypeProtoConverter
import org.apache.spark.sql.types.{DataType, StructType}
import org.apache.spark.sql.util.ArrowUtils
private[sql] class SparkResult[T](
- responses: java.util.Iterator[proto.ExecutePlanResponse],
+ responses: CloseableIterator[proto.ExecutePlanResponse],
allocator: BufferAllocator,
encoder: AgnosticEncoder[T],
timeZoneId: String)
@@ -198,22 +198,22 @@ private[sql] class SparkResult[T](
/**
* Returns an iterator over the contents of the result.
*/
- def iterator: java.util.Iterator[T] with AutoCloseable =
+ def iterator: CloseableIterator[T] =
buildIterator(destructive = false)
/**
* Returns an destructive iterator over the contents of the result.
*/
- def destructiveIterator: java.util.Iterator[T] with AutoCloseable =
+ def destructiveIterator: CloseableIterator[T] =
buildIterator(destructive = true)
- private def buildIterator(destructive: Boolean): java.util.Iterator[T] with
AutoCloseable = {
- new java.util.Iterator[T] with AutoCloseable {
- private[this] var iterator: CloseableIterator[T] = _
+ private def buildIterator(destructive: Boolean): CloseableIterator[T] = {
+ new CloseableIterator[T] {
+ private[this] var iter: CloseableIterator[T] = _
private def initialize(): Unit = {
- if (iterator == null) {
- iterator = new ArrowDeserializingIterator(
+ if (iter == null) {
+ iter = new ArrowDeserializingIterator(
createEncoder(encoder, schema),
new ConcatenatingArrowStreamReader(
allocator,
@@ -225,17 +225,17 @@ private[sql] class SparkResult[T](
override def hasNext: Boolean = {
initialize()
- iterator.hasNext
+ iter.hasNext
}
override def next(): T = {
initialize()
- iterator.next()
+ iter.next()
}
override def close(): Unit = {
- if (iterator != null) {
- iterator.close()
+ if (iter != null) {
+ iter.close()
}
}
}
@@ -246,7 +246,7 @@ private[sql] class SparkResult[T](
*/
override def close(): Unit = cleaner.close()
- override val cleaner: AutoCloseable = new SparkResultCloseable(resultMap)
+ override val cleaner: AutoCloseable = new SparkResultCloseable(resultMap,
responses)
private class ResultMessageIterator(destructive: Boolean) extends
AbstractMessageIterator {
private[this] var totalBytesRead = 0L
@@ -296,7 +296,12 @@ private[sql] class SparkResult[T](
}
}
-private[client] class SparkResultCloseable(resultMap: mutable.Map[Int, (Long,
Seq[ArrowMessage])])
+private[client] class SparkResultCloseable(
+ resultMap: mutable.Map[Int, (Long, Seq[ArrowMessage])],
+ responses: CloseableIterator[proto.ExecutePlanResponse])
extends AutoCloseable {
- override def close(): Unit =
resultMap.values.foreach(_._2.foreach(_.close()))
+ override def close(): Unit = {
+ resultMap.values.foreach(_._2.foreach(_.close()))
+ responses.close()
+ }
}
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowDeserializer.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowDeserializer.scala
index 509ceffc552..55dd640f1b6 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowDeserializer.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowDeserializer.scala
@@ -37,6 +37,7 @@ import org.apache.spark.sql.catalyst.ScalaReflection
import org.apache.spark.sql.catalyst.encoders.AgnosticEncoder
import org.apache.spark.sql.catalyst.encoders.AgnosticEncoders._
import org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
+import org.apache.spark.sql.connect.client.CloseableIterator
import org.apache.spark.sql.errors.{CompilationErrors, ExecutionErrors}
import org.apache.spark.sql.types.Decimal
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderUtils.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderUtils.scala
index ed273369854..b9badc5c936 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderUtils.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderUtils.scala
@@ -40,8 +40,6 @@ private[arrow] object ArrowEncoderUtils {
}
}
-trait CloseableIterator[E] extends Iterator[E] with AutoCloseable
-
private[arrow] object StructVectors {
def unapply(v: AnyRef): Option[(StructVector, Seq[FieldVector])] = v match {
case root: VectorSchemaRoot => Option((null,
root.getFieldVectors.asScala.toSeq))
diff --git
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowSerializer.scala
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowSerializer.scala
index c4a2cfa8a85..9e67522711c 100644
---
a/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowSerializer.scala
+++
b/connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/connect/client/arrow/ArrowSerializer.scala
@@ -38,6 +38,7 @@ import
org.apache.spark.sql.catalyst.DefinedByConstructorParams
import org.apache.spark.sql.catalyst.encoders.AgnosticEncoder
import org.apache.spark.sql.catalyst.encoders.AgnosticEncoders._
import org.apache.spark.sql.catalyst.util.{SparkDateTimeUtils,
SparkIntervalUtils}
+import org.apache.spark.sql.connect.client.CloseableIterator
import org.apache.spark.sql.errors.ExecutionErrors
import org.apache.spark.sql.types.Decimal
import org.apache.spark.sql.util.ArrowUtils
diff --git
a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
index 1403d460b51..98fbff84ba6 100644
---
a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
+++
b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
@@ -755,7 +755,7 @@ class ClientE2ETestSuite extends RemoteSparkSession with
SQLHelper with PrivateM
private def checkSameResult[E](expected: scala.collection.Seq[E], dataset:
Dataset[E]): Unit = {
dataset.withResult { result =>
- assert(expected === result.iterator.asScala.toBuffer)
+ assert(expected === result.iterator.toBuffer)
}
}
diff --git
a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderSuite.scala
b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderSuite.scala
index dd0e9347ac8..7a8e8465a70 100644
---
a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderSuite.scala
+++
b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/connect/client/arrow/ArrowEncoderSuite.scala
@@ -41,6 +41,7 @@ import
org.apache.spark.sql.catalyst.util.DateTimeConstants.MICROS_PER_SECOND
import org.apache.spark.sql.catalyst.util.IntervalStringStyles.ANSI_STYLE
import org.apache.spark.sql.catalyst.util.SparkDateTimeUtils._
import org.apache.spark.sql.catalyst.util.SparkIntervalUtils._
+import org.apache.spark.sql.connect.client.CloseableIterator
import org.apache.spark.sql.connect.client.arrow.FooEnum.FooEnum
import org.apache.spark.sql.connect.client.util.ConnectFunSuite
import org.apache.spark.sql.types.{ArrayType, DataType, DayTimeIntervalType,
Decimal, DecimalType, IntegerType, Metadata, SQLUserDefinedType, StructType,
UserDefinedType, YearMonthIntervalType}
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