Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9421#discussion_r44235617
--- Diff:
extras/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/KinesisCheckpointer.scala
---
@@ -0,0 +1,117 @@
+/*
+ * 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.streaming.kinesis
+
+import java.util.concurrent._
+
+import scala.util.control.NonFatal
+
+import
com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessorCheckpointer
+import com.amazonaws.services.kinesis.clientlibrary.types.ShutdownReason
+
+import org.apache.spark.Logging
+import org.apache.spark.streaming.Duration
+import org.apache.spark.util.ThreadUtils
+
+/**
+ * This is a helper class for managing Kinesis checkpointing.
+ *
+ * @param receiver The receiver that keeps track of which sequence numbers
we can checkpoint
+ * @param checkpointInterval How frequently we will checkpoint to DynamoDB
+ * @param workerId Worker Id of KCL worker for logging purposes
+ */
+private[kinesis] class KinesisCheckpointer(
+ receiver: KinesisReceiver[_],
+ checkpointInterval: Duration,
+ workerId: String) extends Logging {
+
+ // a map from shardId's to checkpointers
+ private val checkpointers = new ConcurrentHashMap[String,
IRecordProcessorCheckpointer]()
+
+ private val lastCheckpointedSeqNums = new ConcurrentHashMap[String,
String]()
+
+ private val checkpointerThread = startCheckpointerThread()
+
+ /** Update the checkpointer instance to the most recent one for the
given shardId. */
+ def setCheckpointer(shardId: String, checkpointer:
IRecordProcessorCheckpointer): Unit = {
+ checkpointers.put(shardId, checkpointer)
+ }
+
+ /**
+ * Stop tracking the specified shardId.
+ *
+ * If a checkpointer is provided, e.g. on IRecordProcessor.shutdown
[[ShutdownReason.TERMINATE]],
--- End diff --
This reasoning in the comment is not relevant any more. Please update
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