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Subject [GitHub] [incubator-hudi] OpenOpened commented on a change in pull request #1360: [HUDI-344][RFC-09] Hudi Dataset Snapshot Exporter
Date Thu, 05 Mar 2020 14:15:30 GMT
OpenOpened 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_r388319029
 
 

 ##########
 File path: hudi-utilities/src/main/java/org/apache/hudi/utilities/HoodieSnapshotExporter.java
 ##########
 @@ -0,0 +1,213 @@
+/*
+ * 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.DataFrameWriter;
+import org.apache.spark.sql.Row;
+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"}, 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")
+    String snapshotPrefix;
+
+    @Parameter(names = {"--output-format"}, description = "e.g. Hudi or Parquet", required
= true)
+    String outputFormat;
+
+    @Parameter(names = {"--output-partition-field"}, description = "A field to be used by
Spark repartitioning")
+    String outputPartitionField;
+  }
+
+  public void export(SparkSession spark, Config cfg) throws IOException {
+    JavaSparkContext jsc = new JavaSparkContext(spark.sparkContext());
+    FileSystem fs = FSUtils.getFs(cfg.sourceBasePath, jsc.hadoopConfiguration());
+
+    final SerializableConfiguration serConf = new SerializableConfiguration(jsc.hadoopConfiguration());
+    final HoodieTableMetaClient tableMetadata = new HoodieTableMetaClient(fs.getConf(), cfg.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, cfg.sourceBasePath,
false);
+    if (partitions.size() > 0) {
+      List<String> dataFiles = new ArrayList<>();
+
+      if (!StringUtils.isNullOrEmpty(cfg.snapshotPrefix)) {
+        for (String partition : partitions) {
+          if (partition.contains(cfg.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 (!cfg.outputFormat.equalsIgnoreCase("hudi")) {
+        // Do transformation
+        DataFrameWriter<Row> write = spark.read().parquet(JavaConversions.asScalaIterator(dataFiles.iterator()).toSeq())
+                .write();
+        if (!StringUtils.isNullOrEmpty(cfg.outputPartitionField)) {
+          // A field to do simple Spark repartitioning
+          write.partitionBy(cfg.outputPartitionField)
+              .format(cfg.outputFormat)
+              .mode(SaveMode.Overwrite)
+              .save(cfg.targetOutputPath);
+        } else {
+          write.format(cfg.outputFormat)
+              .mode(SaveMode.Overwrite)
+              .save(cfg.targetOutputPath);
+        }
+      } else {
+        // No transformation is needed for output format "HUDI", just copy the original files.
+
+        // Make sure the output directory is empty
+        Path outputPath = new Path(cfg.targetOutputPath);
+        if (fs.exists(outputPath)) {
+          LOG.warn(String.format("The output path %s targetBasePath already exists, deleting",
outputPath));
+          fs.delete(new Path(cfg.targetOutputPath), true);
+        }
+
+        jsc.parallelize(partitions, partitions.size()).flatMap(partition -> {
+          // Only take latest version files <= latestCommit.
+          FileSystem fs1 = FSUtils.getFs(cfg.sourceBasePath, serConf.newCopy());
+          List<Tuple2<String, String>> filePaths = new ArrayList<>();
+          dataFiles.forEach(hoodieDataFile -> filePaths.add(new Tuple2<>(partition,
hoodieDataFile)));
+
+          // also need to copy over partition metadata
+          Path partitionMetaFile =
+              new Path(new Path(cfg.sourceBasePath, partition), HoodiePartitionMetadata.HOODIE_PARTITION_METAFILE);
+          if (fs1.exists(partitionMetaFile)) {
+            filePaths.add(new Tuple2<>(partition, partitionMetaFile.toString()));
+          }
+
+          return filePaths.iterator();
+        }).foreach(tuple -> {
+          String partition = tuple._1();
+          Path sourceFilePath = new Path(tuple._2());
+          Path toPartitionPath = new Path(cfg.targetOutputPath, partition);
+          FileSystem ifs = FSUtils.getFs(cfg.targetOutputPath, serConf.newCopy());
+
+          if (!ifs.exists(toPartitionPath)) {
+            ifs.mkdirs(toPartitionPath);
+          }
+          FileUtil.copy(ifs, sourceFilePath, ifs, new Path(toPartitionPath, sourceFilePath.getName()),
false,
+              ifs.getConf());
+        });
+
+        // Also copy the .commit files
+        LOG.info(String.format("Copying .commit files which are no-late-than %s.", latestCommitTimestamp));
+        FileStatus[] commitFilesToCopy =
+            fs.listStatus(new Path(cfg.sourceBasePath + "/" + HoodieTableMetaClient.METAFOLDER_NAME),
(commitFilePath) -> {
+              if (commitFilePath.getName().equals(HoodieTableConfig.HOODIE_PROPERTIES_FILE))
{
+                return true;
+              } else {
+                String commitTime = FSUtils.getCommitFromCommitFile(commitFilePath.getName());
+                return HoodieTimeline.compareTimestamps(commitTime, latestCommitTimestamp,
+                    HoodieTimeline.LESSER_OR_EQUAL);
+              }
+            });
+        for (FileStatus commitStatus : commitFilesToCopy) {
+          Path targetFilePath =
+              new Path(cfg.targetOutputPath + "/" + HoodieTableMetaClient.METAFOLDER_NAME
+ "/" + commitStatus.getPath().getName());
+          if (!fs.exists(targetFilePath.getParent())) {
+            fs.mkdirs(targetFilePath.getParent());
+          }
+          if (fs.exists(targetFilePath)) {
+            LOG.error(
+                String.format("The target output commit file (%s targetBasePath) already
exists.", targetFilePath));
+          }
+          FileUtil.copy(fs, commitStatus.getPath(), fs, targetFilePath, false, fs.getConf());
+        }
+      }
+    } else {
+      LOG.info("The job has 0 partition to copy.");
+    }
+  }
+
+  public static void main(String[] args) throws IOException {
+    // Take input configs
+    final Config cfg = new Config();
+    new JCommander(cfg, null, args);
+
+    // Create a spark job to do the snapshot export
+    SparkSession spark = SparkSession.builder().appName("Hoodie-snapshot-exporter").master("local[2]")
 
 Review comment:
   It's my fault. Thank you for pointing it out

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