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Subject [GitHub] [incubator-hudi] leesf commented on a change in pull request #1360: [HUDI-344][RFC-09] Hudi Dataset Snapshot Exporter
Date Mon, 09 Mar 2020 04:08:10 GMT
leesf commented on a change in pull request #1360: [HUDI-344][RFC-09] Hudi Dataset Snapshot
Exporter
URL: https://github.com/apache/incubator-hudi/pull/1360#discussion_r389455499
 
 

 ##########
 File path: hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieSnapshotExporter.java
 ##########
 @@ -0,0 +1,233 @@
+/*
+ * 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.utilities;
+
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.Parameter;
+
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.fs.Path;
+import org.apache.hudi.common.util.StringUtils;
+import org.apache.hudi.common.SerializableConfiguration;
+import org.apache.hudi.common.model.HoodiePartitionMetadata;
+import org.apache.hudi.common.table.HoodieTableConfig;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.common.table.HoodieTimeline;
+import org.apache.hudi.common.table.TableFileSystemView;
+import org.apache.hudi.common.table.timeline.HoodieInstant;
+import org.apache.hudi.common.table.view.HoodieTableFileSystemView;
+import org.apache.hudi.common.util.FSUtils;
+import org.apache.hudi.common.util.Option;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+import org.apache.spark.api.java.JavaSparkContext;
+import org.apache.spark.sql.Column;
+import org.apache.spark.sql.DataFrameWriter;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.SaveMode;
+import org.apache.spark.sql.SparkSession;
+import org.apache.spark.sql.execution.datasources.DataSource;
+
+import scala.Tuple2;
+import scala.collection.JavaConversions;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Export the latest records of Hudi dataset to a set of external files (e.g., plain parquet
files).
+ */
+
+public class HoodieSnapshotExporter {
+  private static final Logger LOG = LogManager.getLogger(HoodieSnapshotExporter.class);
+
+  public static class Config implements Serializable {
+    @Parameter(names = {"--source-base-path"}, description = "Base path for the source Hudi
dataset to be snapshotted", required = true)
+    String sourceBasePath = null;
+
+    @Parameter(names = {"--target-base-path"}, description = "Base path for the target output
files (snapshots)", required = true)
+    String targetOutputPath = null;
+
+    @Parameter(names = {"--snapshot-prefix"}, description = "Snapshot prefix or directory
under the target base path in order to segregate different snapshots")
 
 Review comment:
   Talked with @xushiyan  offline, the RFC9 means we only export whole hudi dataset, thus
may not support exporting `ROOT/2015/03/16`, thus we could remove `--snapshot-prefix` and
modify the code accordingly. If we need export specified partitions later, we could bring
it back and may need more consideration(maybe not use contains, maybe equals or regular expression).
WDYT @OpenOpened 

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