otterc commented on a change in pull request #30312:
URL: https://github.com/apache/spark/pull/30312#discussion_r525394789
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File path: core/src/main/scala/org/apache/spark/shuffle/ShuffleWriter.scala
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@@ -17,18 +17,463 @@
package org.apache.spark.shuffle
-import java.io.IOException
+import java.io.{File, IOException}
+import java.net.ConnectException
+import java.nio.ByteBuffer
+import java.util.concurrent.ExecutorService
+import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet, Queue}
+
+import com.google.common.base.Throwables
+
+import org.apache.spark.{ShuffleDependency, SparkConf, SparkEnv}
+import org.apache.spark.annotation.Since
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config._
+import org.apache.spark.launcher.SparkLauncher
+import org.apache.spark.network.buffer.{FileSegmentManagedBuffer,
ManagedBuffer, NioManagedBuffer}
+import org.apache.spark.network.netty.SparkTransportConf
+import org.apache.spark.network.shuffle.{BlockFetchingListener}
+import org.apache.spark.network.shuffle.ErrorHandler.BlockPushErrorHandler
+import org.apache.spark.network.util.TransportConf
import org.apache.spark.scheduler.MapStatus
+import org.apache.spark.shuffle.ShuffleWriter._
+import org.apache.spark.storage.{BlockId, BlockManagerId, ShufflePushBlockId}
+import org.apache.spark.util.{ThreadUtils, Utils}
/**
- * Obtained inside a map task to write out records to the shuffle system.
+ * Obtained inside a map task to write out records to the shuffle system, and
optionally
+ * initiate the block push process to remote shuffle services if push based
shuffle is enabled.
*/
-private[spark] abstract class ShuffleWriter[K, V] {
+private[spark] abstract class ShuffleWriter[K, V] extends Logging {
Review comment:
I am working on this one.
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