psolomin commented on code in PR #23540:
URL: https://github.com/apache/beam/pull/23540#discussion_r1157198185


##########
sdks/java/io/amazon-web-services2/src/main/java/org/apache/beam/sdk/io/aws2/kinesis/ShardListingUtils.java:
##########
@@ -0,0 +1,203 @@
+/*
+ * 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.beam.sdk.io.aws2.kinesis;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.Callable;
+import org.apache.beam.sdk.util.BackOff;
+import org.apache.beam.sdk.util.BackOffUtils;
+import org.apache.beam.sdk.util.FluentBackoff;
+import org.apache.beam.sdk.util.Sleeper;
+import 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList;
+import org.joda.time.Duration;
+import org.joda.time.Instant;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import software.amazon.awssdk.core.exception.SdkClientException;
+import software.amazon.awssdk.core.exception.SdkServiceException;
+import software.amazon.awssdk.core.internal.retry.SdkDefaultRetrySetting;
+import software.amazon.awssdk.services.kinesis.KinesisClient;
+import 
software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryRequest;
+import software.amazon.awssdk.services.kinesis.model.ExpiredIteratorException;
+import software.amazon.awssdk.services.kinesis.model.LimitExceededException;
+import software.amazon.awssdk.services.kinesis.model.ListShardsRequest;
+import software.amazon.awssdk.services.kinesis.model.ListShardsResponse;
+import 
software.amazon.awssdk.services.kinesis.model.ProvisionedThroughputExceededException;
+import software.amazon.awssdk.services.kinesis.model.Shard;
+import software.amazon.awssdk.services.kinesis.model.ShardFilter;
+import software.amazon.awssdk.services.kinesis.model.ShardFilterType;
+import software.amazon.awssdk.services.kinesis.model.StreamDescriptionSummary;
+import software.amazon.kinesis.common.InitialPositionInStream;
+
+class ShardListingUtils {

Review Comment:
   I tried to avoid that as far as I could, I knew it would raise questions.
   
   But shard listing is not straightforward (for example, needs to handle some 
pagination). Creating that logic from scratch was extra code, and similar logic 
would live in 2 places. Instantiating `SimplifiedKinesisClient` instead of 
`KinesisClient` and passing it around also felt ugly..
   
   From other point of view, pulling it out was an easy step - I've pulled out 
some methods and tests which were touching those methods. Felt much more 
natural. The code itself didn't change.
   
   If you are strongly against, I can try to revert this change, after 
addressing others. And we see how it finally looks like. After dropping 
`CheckpointGenerator` things it might be less burden to keep 
`SimplifiedKinesisClient` as-is.



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