codope commented on code in PR #6485:
URL: https://github.com/apache/hudi/pull/6485#discussion_r960478153


##########
hudi-cli/src/main/java/org/apache/hudi/cli/commands/DiffCommand.java:
##########
@@ -0,0 +1,196 @@
+/*
+ * 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.hudi.cli.commands;
+
+import org.apache.hudi.cli.HoodieCLI;
+import org.apache.hudi.cli.HoodiePrintHelper;
+import org.apache.hudi.cli.HoodieTableHeaderFields;
+import org.apache.hudi.common.model.HoodieCommitMetadata;
+import org.apache.hudi.common.model.HoodieWriteStat;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.common.table.timeline.HoodieActiveTimeline;
+import org.apache.hudi.common.table.timeline.HoodieArchivedTimeline;
+import org.apache.hudi.common.table.timeline.HoodieDefaultTimeline;
+import org.apache.hudi.common.table.timeline.HoodieInstant;
+import org.apache.hudi.common.util.NumericUtils;
+import org.apache.hudi.common.util.StringUtils;
+
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+import org.springframework.shell.core.CommandMarker;
+import org.springframework.shell.core.annotation.CliCommand;
+import org.springframework.shell.core.annotation.CliOption;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static org.apache.hudi.cli.utils.TimelineUtil.getTimeDaysAgo;
+
+/**
+ * Given a file id or partition value, this command line utility tracks the 
changes to the file group or partition across range of commits.
+ * Usage: diff file --fileId <fileId>
+ */
+@Component
+public class DiffCommand implements CommandMarker {
+
+  private static final Logger LOG = LogManager.getLogger(DiffCommand.class);
+
+  @CliCommand(value = "diff file", help = "Check how file differs across range 
of commits")
+  public String diffFile(
+      @CliOption(key = {"fileId"}, help = "File ID to diff across range of 
commits", mandatory = true) String fileId,
+      @CliOption(key = {"startTs"}, help = "start time for compactions, 
default: now - 10 days") String startTs,
+      @CliOption(key = {"endTs"}, help = "end time for compactions, default: 
now - 1 day") String endTs,
+      @CliOption(key = {"limit"}, help = "Limit compactions", 
unspecifiedDefaultValue = "-1") final Integer limit,
+      @CliOption(key = {"sortBy"}, help = "Sorting Field", 
unspecifiedDefaultValue = "") final String sortByField,
+      @CliOption(key = {"desc"}, help = "Ordering", unspecifiedDefaultValue = 
"false") final boolean descending,
+      @CliOption(key = {"headeronly"}, help = "Print Header Only", 
unspecifiedDefaultValue = "false") final boolean headerOnly,
+      @CliOption(key = {"includeArchivedTimeline"}, help = "Include archived 
commits as well",
+          unspecifiedDefaultValue = "false") final boolean 
includeArchivedTimeline) throws IOException {
+    HoodieDefaultTimeline timeline = getTimelineInRange(startTs, endTs, 
includeArchivedTimeline);
+    return printCommitsWithMetadataForFileId(timeline, limit, sortByField, 
descending, headerOnly, "", fileId);
+  }
+
+  @CliCommand(value = "diff partition", help = "Check how file differs across 
range of commits")
+  public String diffPartition(
+      @CliOption(key = {"partitionPath"}, help = "Relative partition path to 
diff across range of commits", mandatory = true) String partitionPath,
+      @CliOption(key = {"startTs"}, help = "start time for compactions, 
default: now - 10 days") String startTs,
+      @CliOption(key = {"endTs"}, help = "end time for compactions, default: 
now - 1 day") String endTs,
+      @CliOption(key = {"limit"}, help = "Limit compactions", 
unspecifiedDefaultValue = "-1") final Integer limit,
+      @CliOption(key = {"sortBy"}, help = "Sorting Field", 
unspecifiedDefaultValue = "") final String sortByField,
+      @CliOption(key = {"desc"}, help = "Ordering", unspecifiedDefaultValue = 
"false") final boolean descending,
+      @CliOption(key = {"headeronly"}, help = "Print Header Only", 
unspecifiedDefaultValue = "false") final boolean headerOnly,
+      @CliOption(key = {"includeArchivedTimeline"}, help = "Include archived 
commits as well",
+          unspecifiedDefaultValue = "false") final boolean 
includeArchivedTimeline) throws IOException {
+    HoodieDefaultTimeline timeline = getTimelineInRange(startTs, endTs, 
includeArchivedTimeline);
+    return printCommitsWithMetadataForPartition(timeline, limit, sortByField, 
descending, headerOnly, "", partitionPath);
+  }
+
+  private HoodieDefaultTimeline getTimelineInRange(String startTs, String 
endTs, boolean includeArchivedTimeline) {
+    if (StringUtils.isNullOrEmpty(startTs)) {
+      startTs = getTimeDaysAgo(10);
+    }
+    if (StringUtils.isNullOrEmpty(endTs)) {
+      endTs = getTimeDaysAgo(1);
+    }

Review Comment:
   makes sense



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