[GitHub] [hadoop] sidseth commented on a change in pull request #1115: HADOOP-16207 testMR failures

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sidseth commented on a change in pull request #1115: HADOOP-16207 testMR failures
URL: https://github.com/apache/hadoop/pull/1115#discussion_r330164233
 
 

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 File path: hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/commit/integration/ITestS3ACommitterMRJob.java
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+/*
+ * 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.hadoop.fs.s3a.commit.integration;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+import com.google.common.collect.Sets;
+import org.assertj.core.api.Assertions;
+import org.junit.FixMethodOrder;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.junit.runners.MethodSorters;
+import org.junit.runners.Parameterized;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.s3a.S3AFileSystem;
+import org.apache.hadoop.fs.s3a.S3AUtils;
+import org.apache.hadoop.fs.s3a.commit.AbstractYarnClusterITest;
+import org.apache.hadoop.fs.s3a.commit.CommitConstants;
+import org.apache.hadoop.fs.s3a.commit.LoggingTextOutputFormat;
+import org.apache.hadoop.fs.s3a.commit.files.SuccessData;
+import org.apache.hadoop.fs.s3a.commit.magic.MagicS3GuardCommitter;
+import org.apache.hadoop.fs.s3a.commit.staging.DirectoryStagingCommitter;
+import org.apache.hadoop.fs.s3a.commit.staging.PartitionedStagingCommitter;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.JobStatus;
+import org.apache.hadoop.mapreduce.Mapper;
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.DurationInfo;
+
+import static org.apache.hadoop.fs.s3a.S3ATestUtils.disableFilesystemCaching;
+import static org.apache.hadoop.fs.s3a.S3ATestUtils.lsR;
+import static org.apache.hadoop.fs.s3a.S3AUtils.applyLocatedFiles;
+import static org.apache.hadoop.fs.s3a.commit.CommitConstants.FS_S3A_COMMITTER_STAGING_TMP_PATH;
+import static org.apache.hadoop.fs.s3a.commit.CommitConstants.MAGIC;
+import static org.apache.hadoop.fs.s3a.commit.CommitConstants._SUCCESS;
+import static org.apache.hadoop.fs.s3a.commit.InternalCommitterConstants.FS_S3A_COMMITTER_STAGING_UUID;
+import static org.apache.hadoop.fs.s3a.commit.staging.Paths.getMultipartUploadCommitsDirectory;
+import static org.apache.hadoop.fs.s3a.commit.staging.StagingCommitterConstants.STAGING_UPLOADS;
+import static org.apache.hadoop.test.LambdaTestUtils.intercept;
+
+/**
+ * Test an MR Job with all the different committers.
+ * <p>
+ * This is a fairly complex parameterization: it is designed to
+ * avoid the overhead of starting a Yarn cluster for
+ * individual committer types, so speed up operations.
+ * <p>
+ * It also implicitly guarantees that there is never more than one of these
+ * MR jobs active at a time, so avoids overloading the test machine with too
+ * many processes.
+ * How the binding works:
+ * <ol>
+ *   <li>
+ *     Each parameterized suite is configured through its own
+ *     {@link CommitterTestBinding} subclass.
+ *   </li>
+ *   <li>
+ *     JUnit runs these test suites one parameterized binding at a time.
+ *   </li>
+ *   <li>
+ *     The test suites are declared to be executed in ascending order, so
 
 Review comment:
   A little confused by the intent of this flow - i.e. test_000, test_100, test_200, test_500 in order.
   1) What happens if test_000 fails - will the rest of the tests still be run for the specific parameter?
   2) The names - test_000, test_100 etc don't say a lot about what is actually being done in the methods.
   
   It may be easier to have a single test method - which takes care of setup, validation, etc - and allow override points within that for the individual committers. That would lead to a single test failing and not attempting to run the others after a previous dependent failure.
   
   Also, mentioned making the cluster non-static in another comment. Given parameterized tests instantiate a new instance of the class each time - maybe just the '@AfterClass' teerdown and cluster setup needs to move to this class (still as static).

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