[GitHub] [kafka] fvaleri commented on a diff in pull request #13171: KAFKA-14584: Move StateChangeLogMerger tool

["fvaleri (via GitHub)" <gi...@apache.org>]

fvaleri commented on code in PR #13171:
URL: https://github.com/apache/kafka/pull/13171#discussion_r1096043542


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tools/src/main/java/org/apache/kafka/tools/StateChangeLogMerger.java:
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@@ -0,0 +1,320 @@
+/*
+ * 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.kafka.tools;
+
+import joptsimple.OptionSpec;
+import org.apache.kafka.common.internals.Topic;
+import org.apache.kafka.common.utils.Exit;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.server.util.CommandDefaultOptions;
+import org.apache.kafka.server.util.CommandLineUtils;
+import org.apache.kafka.server.util.ToolsUtils;
+
+import java.io.File;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.Serializable;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Date;
+import java.util.Arrays;
+import java.util.List;
+import java.util.PriorityQueue;
+import java.util.Scanner;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import static java.lang.String.format;
+
+/**
+ * A utility that merges the state change logs (possibly obtained from different brokers and over multiple days).
+ *
+ * This utility expects at least one of the following two arguments -
+ * 1. A list of state change log files
+ * 2. A regex to specify state change log file names.
+ *
+ * This utility optionally also accepts the following arguments -
+ * 1. The topic whose state change logs should be merged
+ * 2. A list of partitions whose state change logs should be merged (can be specified only when the topic argument
+ * is explicitly specified)
+ * 3. Start time from when the logs should be merged
+ * 4. End time until when the logs should be merged
+ */
+public class StateChangeLogMerger {
+    private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss,SSS";
+    private static final Pattern DATE_PATTERN = Pattern.compile("([0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3}){1}");
+    private static final Pattern TOPIC_PART_PATTERN = Pattern.compile("\\[(" + Topic.LEGAL_CHARS + "+),([0-9]+)\\]");
+
+    public static void main(String[] args) {
+        try {
+            StateChangeLogMergerOptions options = new StateChangeLogMergerOptions(args);
+            if (printHelpOrVersion(options) || !validInput(options)) return;

Review Comment:
   Yes, that was the original intention. Thanks.



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