[MINOR][CORE] Remove unused variables, unused imports, etc.

## What changes were proposed in this pull request? - Remove unused variables. - Remove unused imports. - Change var to val in few places. ## How was this patch tested? Unit tests. Closes #24857 from imback82/unused_variable. Authored-by: Terry Kim <yuminkim@gmail.com> Signed-off-by: Sean Owen <sean.owen@databricks.com>
2019-06-15 09:42:22 -05:00 · 2019-06-15 09:42:22 -05:00 · a950570f91
parent 26998b86c1
commit a950570f91
35 changed files with 19 additions and 95 deletions
--- a/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
+++ b/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
@ -567,7 +567,6 @@ private[spark] class ExecutorAllocationManager(

    override def onTaskStart(taskStart: SparkListenerTaskStart): Unit = {
      val stageId = taskStart.stageId
-      val taskId = taskStart.taskInfo.taskId
      val taskIndex = taskStart.taskInfo.index

      allocationManager.synchronized {
@ -589,7 +588,6 @@ private[spark] class ExecutorAllocationManager(
    }

    override def onTaskEnd(taskEnd: SparkListenerTaskEnd): Unit = {
-      val taskId = taskEnd.taskInfo.taskId
      val taskIndex = taskEnd.taskInfo.index
      val stageId = taskEnd.stageId
      allocationManager.synchronized {
--- a/core/src/main/scala/org/apache/spark/MapOutputTracker.scala
+++ b/core/src/main/scala/org/apache/spark/MapOutputTracker.scala
@ -227,7 +227,7 @@ private[spark] class MapOutputTrackerMasterEndpoint(
    case GetMapOutputStatuses(shuffleId: Int) =>
      val hostPort = context.senderAddress.hostPort
      logInfo("Asked to send map output locations for shuffle " + shuffleId + " to " + hostPort)
-      val mapOutputStatuses = tracker.post(new GetMapOutputMessage(shuffleId, context))
+      tracker.post(new GetMapOutputMessage(shuffleId, context))

    case StopMapOutputTracker =>
      logInfo("MapOutputTrackerMasterEndpoint stopped!")
--- a/core/src/main/scala/org/apache/spark/SecurityManager.scala
+++ b/core/src/main/scala/org/apache/spark/SecurityManager.scala
@ -18,7 +18,6 @@
 package org.apache.spark

 import java.io.File
-import java.net.{Authenticator, PasswordAuthentication}
 import java.nio.charset.StandardCharsets.UTF_8
 import java.nio.file.Files
 import java.util.Base64
--- a/core/src/main/scala/org/apache/spark/api/java/JavaPairRDD.scala
+++ b/core/src/main/scala/org/apache/spark/api/java/JavaPairRDD.scala
@ -19,7 +19,7 @@ package org.apache.spark.api.java

 import java.{lang => jl}
 import java.lang.{Iterable => JIterable}
-import java.util.{Comparator, Iterator => JIterator, List => JList}
+import java.util.{Comparator, List => JList}

 import scala.collection.JavaConverters._
 import scala.language.implicitConversions
--- a/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala
+++ b/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala
@ -17,7 +17,7 @@

 package org.apache.spark.api.python

-import java.io.{DataInputStream, DataOutputStream, EOFException, InputStream, OutputStreamWriter}
+import java.io.{DataInputStream, DataOutputStream, EOFException, InputStream}
 import java.net.{InetAddress, ServerSocket, Socket, SocketException}
 import java.util.Arrays
 import java.util.concurrent.TimeUnit
--- a/core/src/main/scala/org/apache/spark/api/r/RBackendAuthHandler.scala
+++ b/core/src/main/scala/org/apache/spark/api/r/RBackendAuthHandler.scala
@ -23,7 +23,6 @@ import java.nio.charset.StandardCharsets.UTF_8
 import io.netty.channel.{Channel, ChannelHandlerContext, SimpleChannelInboundHandler}

 import org.apache.spark.internal.Logging
-import org.apache.spark.util.Utils

 /**
 * Authentication handler for connections from the R process.
--- a/core/src/main/scala/org/apache/spark/api/r/SerDe.scala
+++ b/core/src/main/scala/org/apache/spark/api/r/SerDe.scala
@ -102,7 +102,7 @@ private[spark] object SerDe {
  def readBytes(in: DataInputStream): Array[Byte] = {
    val len = readInt(in)
    val out = new Array[Byte](len)
-    val bytesRead = in.readFully(out)
+    in.readFully(out)
    out
  }

--- a/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
@ -18,7 +18,7 @@
 package org.apache.spark.deploy

 import java.io._
-import java.lang.reflect.{InvocationTargetException, Modifier, UndeclaredThrowableException}
+import java.lang.reflect.{InvocationTargetException, UndeclaredThrowableException}
 import java.net.{URI, URL}
 import java.security.PrivilegedExceptionAction
 import java.text.ParseException
@ -26,7 +26,7 @@ import java.util.{ServiceLoader, UUID}

 import scala.annotation.tailrec
 import scala.collection.JavaConverters._
-import scala.collection.mutable.{ArrayBuffer, HashMap, Map}
+import scala.collection.mutable.ArrayBuffer
 import scala.util.{Properties, Try}

 import org.apache.commons.io.FilenameUtils
@ -317,7 +317,6 @@ private[spark] class SparkSubmit extends Logging {
    val isKubernetesClient = clusterManager == KUBERNETES && deployMode == CLIENT
    val isKubernetesClusterModeDriver = isKubernetesClient &&
      sparkConf.getBoolean("spark.kubernetes.submitInDriver", false)
-    val isMesosClient = clusterManager == MESOS && deployMode == CLIENT

    if (!isMesosCluster && !isStandAloneCluster) {
      // Resolve maven dependencies if there are any and add classpath to jars. Add them to py-files
--- a/core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala
@ -22,7 +22,7 @@ import java.io.File
 import org.apache.commons.lang3.StringUtils

 import org.apache.spark.{SecurityManager, SparkConf}
-import org.apache.spark.deploy.{DependencyUtils, SparkHadoopUtil, SparkSubmit}
+import org.apache.spark.deploy.{DependencyUtils, SparkHadoopUtil}
 import org.apache.spark.internal.{config, Logging}
 import org.apache.spark.rpc.RpcEnv
 import org.apache.spark.util._
--- a/core/src/main/scala/org/apache/spark/executor/CoarseGrainedExecutorBackend.scala
+++ b/core/src/main/scala/org/apache/spark/executor/CoarseGrainedExecutorBackend.scala
@ -17,7 +17,6 @@

 package org.apache.spark.executor

-import java.io.{BufferedInputStream, FileInputStream}
 import java.net.URL
 import java.nio.ByteBuffer
 import java.util.Locale
@ -27,11 +26,7 @@ import scala.collection.mutable
 import scala.util.{Failure, Success}
 import scala.util.control.NonFatal

-import com.fasterxml.jackson.databind.exc.MismatchedInputException
 import org.json4s.DefaultFormats
-import org.json4s.JsonAST.JArray
-import org.json4s.MappingException
-import org.json4s.jackson.JsonMethods._

 import org.apache.spark._
 import org.apache.spark.TaskState.TaskState
--- a/core/src/main/scala/org/apache/spark/memory/ExecutionMemoryPool.scala
+++ b/core/src/main/scala/org/apache/spark/memory/ExecutionMemoryPool.scala
@ -151,7 +151,7 @@ private[memory] class ExecutionMemoryPool(
   */
  def releaseMemory(numBytes: Long, taskAttemptId: Long): Unit = lock.synchronized {
    val curMem = memoryForTask.getOrElse(taskAttemptId, 0L)
-    var memoryToFree = if (curMem < numBytes) {
+    val memoryToFree = if (curMem < numBytes) {
      logWarning(
        s"Internal error: release called on $numBytes bytes but task only has $curMem bytes " +
          s"of memory from the $poolName pool")
--- a/core/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala
+++ b/core/src/main/scala/org/apache/spark/metrics/ExecutorMetricType.scala
@ -206,7 +206,6 @@ private[spark] object ExecutorMetricType {
    var numberOfMetrics = 0
    val definedMetricsAndOffset = mutable.LinkedHashMap.empty[String, Int]
    metricGetters.foreach { m =>
-      var metricInSet = 0
      (0 until m.names.length).foreach { idx =>
        definedMetricsAndOffset += (m.names(idx) -> (idx + numberOfMetrics))
      }
--- a/core/src/main/scala/org/apache/spark/metrics/sink/GraphiteSink.scala
+++ b/core/src/main/scala/org/apache/spark/metrics/sink/GraphiteSink.scala
@ -17,7 +17,6 @@

 package org.apache.spark.metrics.sink

-import java.net.InetSocketAddress
 import java.util.{Locale, Properties}
 import java.util.concurrent.TimeUnit

--- a/core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala
@ -364,7 +364,7 @@ private class DefaultPartitionCoalescer(val balanceSlack: Double = 0.10)
      val partNoLocIter = partitionLocs.partsWithoutLocs.iterator
      groupArr.filter(pg => pg.numPartitions == 0).foreach { pg =>
        while (partNoLocIter.hasNext && pg.numPartitions == 0) {
-          var nxt_part = partNoLocIter.next()
+          val nxt_part = partNoLocIter.next()
          if (!initialHash.contains(nxt_part)) {
            pg.partitions += nxt_part
            initialHash += nxt_part
--- a/core/src/main/scala/org/apache/spark/rdd/PipedRDD.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/PipedRDD.scala
@ -32,7 +32,7 @@ import scala.collection.mutable.ArrayBuffer
 import scala.io.Source
 import scala.reflect.ClassTag

-import org.apache.spark.{Partition, SparkEnv, TaskContext}
+import org.apache.spark.{Partition, TaskContext}
 import org.apache.spark.util.Utils


@ -109,7 +109,6 @@ private[spark] class PipedRDD[T: ClassTag](
    }

    val proc = pb.start()
-    val env = SparkEnv.get
    val childThreadException = new AtomicReference[Throwable](null)

    // Start a thread to print the process's stderr to ours
--- a/core/src/main/scala/org/apache/spark/rpc/RpcEndpointRef.scala
+++ b/core/src/main/scala/org/apache/spark/rpc/RpcEndpointRef.scala
@ -20,7 +20,7 @@ package org.apache.spark.rpc
 import scala.concurrent.Future
 import scala.reflect.ClassTag

-import org.apache.spark.{SparkConf, SparkException}
+import org.apache.spark.SparkConf
 import org.apache.spark.internal.Logging
 import org.apache.spark.util.RpcUtils

--- a/core/src/main/scala/org/apache/spark/scheduler/EventLoggingListener.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/EventLoggingListener.scala
@ -20,7 +20,6 @@ package org.apache.spark.scheduler
 import java.io._
 import java.net.URI
 import java.nio.charset.StandardCharsets
-import java.util.Locale

 import scala.collection.mutable.{ArrayBuffer, Map}

--- a/core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala
@ -24,12 +24,11 @@ import scala.collection.Map

 import com.fasterxml.jackson.annotation.JsonTypeInfo

-import org.apache.spark.{SparkConf, TaskEndReason}
+import org.apache.spark.TaskEndReason
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.executor.{ExecutorMetrics, TaskMetrics}
 import org.apache.spark.scheduler.cluster.ExecutorInfo
 import org.apache.spark.storage.{BlockManagerId, BlockUpdatedInfo}
-import org.apache.spark.ui.SparkUI

@DeveloperApi
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "Event")
--- a/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
@ -21,7 +21,6 @@ import java.util.concurrent.TimeUnit
 import java.util.concurrent.atomic.{AtomicInteger, AtomicReference}
 import javax.annotation.concurrent.GuardedBy

-import scala.collection.mutable
 import scala.collection.mutable.{HashMap, HashSet}
 import scala.concurrent.Future

--- a/core/src/main/scala/org/apache/spark/status/AppStatusStore.scala
+++ b/core/src/main/scala/org/apache/spark/status/AppStatusStore.scala
@ -25,7 +25,7 @@ import scala.collection.mutable.HashMap
 import org.apache.spark.{JobExecutionStatus, SparkConf}
 import org.apache.spark.status.api.v1
 import org.apache.spark.ui.scope._
-import org.apache.spark.util.{Distribution, Utils}
+import org.apache.spark.util.Utils
 import org.apache.spark.util.kvstore.{InMemoryStore, KVStore}

 /**
--- a/core/src/main/scala/org/apache/spark/status/api/v1/ApplicationListResource.scala
+++ b/core/src/main/scala/org/apache/spark/status/api/v1/ApplicationListResource.scala
@ -16,7 +16,7 @@
 */
 package org.apache.spark.status.api.v1

-import java.util.{Date, List => JList}
+import java.util.{List => JList}
 import javax.ws.rs.{DefaultValue, GET, Produces, QueryParam}
 import javax.ws.rs.core.MediaType

--- a/core/src/main/scala/org/apache/spark/status/api/v1/JacksonMessageWriter.scala
+++ b/core/src/main/scala/org/apache/spark/status/api/v1/JacksonMessageWriter.scala
@ -19,7 +19,6 @@ package org.apache.spark.status.api.v1
 import java.io.OutputStream
 import java.lang.annotation.Annotation
 import java.lang.reflect.Type
-import java.nio.charset.StandardCharsets
 import java.text.SimpleDateFormat
 import java.util.{Calendar, Locale, SimpleTimeZone}
 import javax.ws.rs.Produces
--- a/core/src/main/scala/org/apache/spark/status/api/v1/OneApplicationResource.scala
+++ b/core/src/main/scala/org/apache/spark/status/api/v1/OneApplicationResource.scala
@ -25,7 +25,6 @@ import javax.ws.rs.core.{MediaType, Response, StreamingOutput}
 import scala.util.control.NonFatal

 import org.apache.spark.{JobExecutionStatus, SparkContext}
-import org.apache.spark.ui.UIUtils

@Produces(Array(MediaType.APPLICATION_JSON))
 private[v1] class AbstractApplicationResource extends BaseAppResource {
--- a/core/src/main/scala/org/apache/spark/status/api/v1/StagesResource.scala
+++ b/core/src/main/scala/org/apache/spark/status/api/v1/StagesResource.scala
@ -20,11 +20,7 @@ import java.util.{HashMap, List => JList, Locale}
 import javax.ws.rs._
 import javax.ws.rs.core.{Context, MediaType, MultivaluedMap, UriInfo}

-import org.apache.spark.SparkException
-import org.apache.spark.scheduler.StageInfo
-import org.apache.spark.status.api.v1.StageStatus._
-import org.apache.spark.status.api.v1.TaskSorting._
-import org.apache.spark.ui.{SparkUI, UIUtils}
+import org.apache.spark.ui.UIUtils
 import org.apache.spark.ui.jobs.ApiHelper._
 import org.apache.spark.util.Utils

--- a/core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
+++ b/core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
@ -17,8 +17,7 @@

 package org.apache.spark.storage

-import java.io.{InputStream, IOException, SequenceInputStream}
-import java.nio.ByteBuffer
+import java.io.{InputStream, IOException}
 import java.util.concurrent.{LinkedBlockingQueue, TimeUnit}
 import javax.annotation.concurrent.GuardedBy

--- a/core/src/main/scala/org/apache/spark/ui/SparkUI.scala
+++ b/core/src/main/scala/org/apache/spark/ui/SparkUI.scala
@ -17,11 +17,9 @@

 package org.apache.spark.ui

-import java.util.{Date, List => JList, ServiceLoader}
+import java.util.Date

-import scala.collection.JavaConverters._
-
-import org.apache.spark.{JobExecutionStatus, SecurityManager, SparkConf, SparkContext}
+import org.apache.spark.{SecurityManager, SparkConf, SparkContext}
 import org.apache.spark.internal.Logging
 import org.apache.spark.internal.config.UI._
 import org.apache.spark.scheduler._
@ -32,7 +30,6 @@ import org.apache.spark.ui.env.EnvironmentTab
 import org.apache.spark.ui.exec.ExecutorsTab
 import org.apache.spark.ui.jobs.{JobsTab, StagesTab}
 import org.apache.spark.ui.storage.StorageTab
-import org.apache.spark.util.Utils

 /**
 * Top level user interface for a Spark application.
--- a/core/src/main/scala/org/apache/spark/ui/jobs/JobPage.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/JobPage.scala
@ -26,7 +26,6 @@ import scala.xml.{Node, NodeSeq, Unparsed, Utility}
 import org.apache.commons.lang3.StringEscapeUtils

 import org.apache.spark.JobExecutionStatus
-import org.apache.spark.scheduler._
 import org.apache.spark.status.AppStatusStore
 import org.apache.spark.status.api.v1
 import org.apache.spark.ui._
--- a/core/src/main/scala/org/apache/spark/ui/jobs/JobsTab.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/JobsTab.scala
@ -19,8 +19,6 @@ package org.apache.spark.ui.jobs

 import javax.servlet.http.HttpServletRequest

-import scala.collection.JavaConverters._
-
 import org.apache.spark.JobExecutionStatus
 import org.apache.spark.internal.config.SCHEDULER_MODE
 import org.apache.spark.scheduler.SchedulingMode
--- a/core/src/main/scala/org/apache/spark/ui/jobs/PoolPage.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/PoolPage.scala
@ -22,7 +22,6 @@ import javax.servlet.http.HttpServletRequest
 import scala.xml.Node

 import org.apache.spark.status.PoolData
-import org.apache.spark.status.api.v1._
 import org.apache.spark.ui.{UIUtils, WebUIPage}

 /** Page showing specific pool details */
--- a/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala
@ -87,7 +87,6 @@ private[ui] class StagePage(parent: StagesTab, store: AppStatusStore) extends We
    val parameterAttempt = request.getParameter("attempt")
    require(parameterAttempt != null && parameterAttempt.nonEmpty, "Missing attempt parameter")

-    val parameterTaskPage = request.getParameter("task.page")
    val parameterTaskSortColumn = request.getParameter("task.sort")
    val parameterTaskSortDesc = request.getParameter("task.desc")
    val parameterTaskPageSize = request.getParameter("task.pageSize")
@ -98,7 +97,6 @@ private[ui] class StagePage(parent: StagesTab, store: AppStatusStore) extends We
    var eventTimelineTaskPageSize = Option(
      eventTimelineParameterTaskPageSize).map(_.toInt).getOrElse(100)

-    val taskPage = Option(parameterTaskPage).map(_.toInt).getOrElse(1)
    val taskSortColumn = Option(parameterTaskSortColumn).map { sortColumn =>
      UIUtils.decodeURLParameter(sortColumn)
    }.getOrElse("Index")
@ -131,13 +129,6 @@ private[ui] class StagePage(parent: StagesTab, store: AppStatusStore) extends We
      return UIUtils.headerSparkPage(request, stageHeader, content, parent)
    }

-    val storedTasks = store.taskCount(stageData.stageId, stageData.attemptId)
-    val numCompleted = stageData.numCompleteTasks
-    val totalTasksNumStr = if (totalTasks == storedTasks) {
-      s"$totalTasks"
-    } else {
-      s"$totalTasks, showing $storedTasks"
-    }
    if (eventTimelineTaskPageSize < 1 || eventTimelineTaskPageSize > totalTasks) {
      eventTimelineTaskPageSize = totalTasks
    }
@ -210,19 +201,6 @@ private[ui] class StagePage(parent: StagesTab, store: AppStatusStore) extends We
    val stageGraph = parent.store.asOption(parent.store.operationGraphForStage(stageId))
    val dagViz = UIUtils.showDagVizForStage(stageId, stageGraph)

-    val accumulableHeaders: Seq[String] = Seq("Accumulable", "Value")
-    def accumulableRow(acc: AccumulableInfo): Seq[Node] = {
-      if (acc.name != null && acc.value != null) {
-        <tr><td>{acc.name}</td><td>{acc.value}</td></tr>
-      } else {
-        Nil
-      }
-    }
-    val accumulableTable = UIUtils.listingTable(
-      accumulableHeaders,
-      accumulableRow,
-      stageData.accumulatorUpdates.toSeq)
-
    val currentTime = System.currentTimeMillis()
    val taskTable = try {
      val _taskTable = new TaskPagedTable(
@ -241,21 +219,6 @@ private[ui] class StagePage(parent: StagesTab, store: AppStatusStore) extends We
        null
    }

-    val jsForScrollingDownToTaskTable =
-      <script>
-        {Unparsed {
-          """
-            |$(function() {
-            |  if (/.*&task.sort=.*$/.test(location.search)) {
-            |    var topOffset = $("#tasks-section").offset().top;
-            |    $("html,body").animate({scrollTop: topOffset}, 200);
-            |  }
-            |});
-          """.stripMargin
-          }
-        }
-      </script>
-
    val content =
      summary ++
      dagViz ++ <div id="showAdditionalMetrics"></div> ++
--- a/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
@ -412,8 +412,6 @@ private[ui] class StageDataSource(
  }

  private def stageRow(stageData: v1.StageData): StageTableRowData = {
-    val description = stageData.description.getOrElse("")
-
    val formattedSubmissionTime = stageData.submissionTime match {
      case Some(t) => UIUtils.formatDate(t)
      case None => "Unknown"
--- a/core/src/main/scala/org/apache/spark/ui/jobs/StagesTab.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/StagesTab.scala
@ -23,7 +23,7 @@ import org.apache.spark.internal.config.SCHEDULER_MODE
 import org.apache.spark.scheduler.SchedulingMode
 import org.apache.spark.status.AppStatusStore
 import org.apache.spark.status.api.v1.StageStatus
-import org.apache.spark.ui.{SparkUI, SparkUITab, UIUtils}
+import org.apache.spark.ui.{SparkUI, SparkUITab}

 /** Web UI showing progress status of all stages in the given SparkContext. */
 private[ui] class StagesTab(val parent: SparkUI, val store: AppStatusStore)
--- a/core/src/main/scala/org/apache/spark/util/CommandLineUtils.scala
+++ b/core/src/main/scala/org/apache/spark/util/CommandLineUtils.scala
@ -19,8 +19,6 @@ package org.apache.spark.util

 import java.io.PrintStream

-import org.apache.spark.SparkException
-
 /**
 * Contains basic command line parsing functionality and methods to parse some common Spark CLI
 * options.
--- a/core/src/main/scala/org/apache/spark/util/collection/PartitionedPairBuffer.scala
+++ b/core/src/main/scala/org/apache/spark/util/collection/PartitionedPairBuffer.scala
@ -19,7 +19,6 @@ package org.apache.spark.util.collection

 import java.util.Comparator

-import org.apache.spark.unsafe.Platform
 import org.apache.spark.unsafe.array.ByteArrayMethods
 import org.apache.spark.util.collection.WritablePartitionedPairCollection._

--- a/core/src/main/scala/org/apache/spark/util/io/ChunkedByteBufferFileRegion.scala
+++ b/core/src/main/scala/org/apache/spark/util/io/ChunkedByteBufferFileRegion.scala
@ -18,10 +18,6 @@ package org.apache.spark.util.io

 import java.nio.channels.WritableByteChannel

-import io.netty.channel.FileRegion
-import io.netty.util.AbstractReferenceCounted
-
-import org.apache.spark.internal.Logging
 import org.apache.spark.network.util.AbstractFileRegion