Github user arunmahadevan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21199#discussion_r189111977
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ContinuousRecordEndpoint.scala
 ---
    @@ -0,0 +1,61 @@
    +/*
    + * 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.execution.streaming
    +
    +import org.apache.spark.SparkEnv
    +import org.apache.spark.rpc.{RpcCallContext, RpcEnv, ThreadSafeRpcEndpoint}
    +import org.apache.spark.sql.Row
    +import org.apache.spark.sql.sources.v2.reader.streaming.PartitionOffset
    +
    +case class ContinuousRecordPartitionOffset(partitionId: Int, offset: Int) 
extends PartitionOffset
    +case class GetRecord(offset: ContinuousRecordPartitionOffset)
    +
    +/**
    + * A RPC end point for continuous readers to poll for
    + * records from the driver.
    + *
    + * @param buckets the data buckets
    --- End diff --
    
    Added more comments to clarify.


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