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Subject [GitHub] [incubator-hudi] xushiyan commented on a change in pull request #1360: [HUDI-344][RFC-09] Hudi Dataset Snapshot Exporter
Date Sat, 29 Feb 2020 07:32:19 GMT
xushiyan 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_r386009385
 
 

 ##########
 File path: hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieSnapshotExporter.java
 ##########
 @@ -0,0 +1,219 @@
+/*
+ * 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.SaveMode;
+import org.apache.spark.sql.SparkSession;
+
+import scala.Tuple2;
+import scala.collection.JavaConversions;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.ArrayList;
+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", "-sbp"}, description = "Base path for the source
Hudi dataset to be snapshotted", required = true)
+    String basePath = null;
+
+    @Parameter(names = {"--target-base-path", "-tbp"}, description = "Base path for the target
output files (snapshots)", required = true)
+    String outputPath = null;
+
+    @Parameter(names = {"--snapshot-prefix", "-sp"}, description = "Snapshot prefix or directory
under the target base path in order to segregate different snapshots")
+    String snapshotPrefix;
+
+    @Parameter(names = {"--output-format", "-of"}, description = "e.g. Hudi or Parquet",
required = true)
+    String outputFormat;
+
+    @Parameter(names = {"--output-partition-field", "-opf"}, description = "A field to be
used by Spark repartitioning")
+    String outputPartitionField;
+  }
+
+  public void export(SparkSession spark, Config cfg) throws IOException {
+    String sourceBasePath = cfg.basePath;
+    String targetBasePath = cfg.outputPath;
+    String snapshotPrefix = cfg.snapshotPrefix;
+    String outputFormat = cfg.outputFormat;
+    String outputPartitionField = cfg.outputPartitionField;
+    JavaSparkContext jsc = new JavaSparkContext(spark.sparkContext());
+    FileSystem fs = FSUtils.getFs(sourceBasePath, jsc.hadoopConfiguration());
+
+    final SerializableConfiguration serConf = new SerializableConfiguration(jsc.hadoopConfiguration());
+    final HoodieTableMetaClient tableMetadata = new HoodieTableMetaClient(fs.getConf(), sourceBasePath);
+    final TableFileSystemView.BaseFileOnlyView fsView = new HoodieTableFileSystemView(tableMetadata,
+        tableMetadata.getActiveTimeline().getCommitsTimeline().filterCompletedInstants());
+    // Get the latest commit
+    Option<HoodieInstant> latestCommit =
+        tableMetadata.getActiveTimeline().getCommitsTimeline().filterCompletedInstants().lastInstant();
+    if (!latestCommit.isPresent()) {
+      LOG.warn("No commits present. Nothing to snapshot");
+      return;
+    }
+    final String latestCommitTimestamp = latestCommit.get().getTimestamp();
+    LOG.info(String.format("Starting to snapshot latest version files which are also no-late-than
%s.",
+        latestCommitTimestamp));
+
+    List<String> partitions = FSUtils.getAllPartitionPaths(fs, sourceBasePath, false);
+    if (partitions.size() > 0) {
+      List<String> dataFiles = new ArrayList<>();
+
+      if (!StringUtils.isNullOrEmpty(snapshotPrefix)) {
+        for (String partition : partitions) {
+          if (partition.contains(snapshotPrefix)) {
+            dataFiles.addAll(fsView.getLatestBaseFilesBeforeOrOn(partition, latestCommitTimestamp).map(f
-> f.getPath()).collect(Collectors.toList()));
+          }
+        }
+      } else {
+        for (String partition : partitions) {
+          dataFiles.addAll(fsView.getLatestBaseFilesBeforeOrOn(partition, latestCommitTimestamp).map(f
-> f.getPath()).collect(Collectors.toList()));
+        }
+      }
+
+      if (!outputFormat.equalsIgnoreCase("hudi")) {
 
 Review comment:
   it would be good to have a `switch` to differentiate the cases and refactor each case to
different methods for readability.
   Note that though we only have 'hudi' and 'parquet' for now, there could be more cases in
future when needs rise.

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