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https://issues.apache.org/jira/browse/HADOOP-18830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811889#comment-17811889
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ASF GitHub Bot commented on HADOOP-18830:
-----------------------------------------
steveloughran commented on code in PR #6144:
URL: https://github.com/apache/hadoop/pull/6144#discussion_r1469632159
##########
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/select/ITestSelectUnsupported.java:
##########
@@ -0,0 +1,100 @@
+/*
+ * 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.select;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.contract.ContractTestUtils;
+import org.apache.hadoop.fs.s3a.AbstractS3ATestBase;
+import org.apache.hadoop.fs.s3a.S3AFileSystem;
+import org.apache.hadoop.fs.s3a.s3guard.S3GuardTool;
+import org.apache.hadoop.util.ExitUtil;
+
+import static org.apache.hadoop.fs.s3a.select.SelectConstants.SELECT_SQL;
+import static
org.apache.hadoop.fs.s3a.select.SelectConstants.SELECT_UNSUPPORTED;
+import static
org.apache.hadoop.service.launcher.LauncherExitCodes.EXIT_UNSUPPORTED_VERSION;
+import static org.apache.hadoop.test.LambdaTestUtils.intercept;
+import static org.apache.hadoop.util.ExitUtil.disableSystemExit;
+
+/**
+ * Verify that s3 select is unsupported.
+ */
+public class ITestSelectUnsupported extends AbstractS3ATestBase {
+
+ /**
+ * S3 Select SQL statement.
+ */
+ private static final String STATEMENT = "SELECT *" +
+ " FROM S3Object s" +
+ " WHERE s._1 = 'foo'";
+
+ /**
+ * A {@code .must(SELECT_SQL, _)} option MSUT not fail the build.
Review Comment:
correct. updated this and other javadocs, named methods appropriately
> S3A: Cut S3 Select
> ------------------
>
> Key: HADOOP-18830
> URL: https://issues.apache.org/jira/browse/HADOOP-18830
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
>
> getting s3 select to work with the v2 sdk is tricky, we need to add extra
> libraries to the classpath beyond just bundle.jar. we can do this but
> * AFAIK nobody has ever done CSV predicate pushdown, as it breaks split logic
> completely
> * CSV is a bad format
> * one-line JSON more structured but also way less efficient
> ORC/Parquet benefit from vectored IO and work spanning the cluster.
> accordingly, I'm wondering what to do about s3 select
> # cut?
> # downgrade to optional and document the extra classes on the classpath
> Option #2 is straightforward and effectively the default. we can also declare
> the feature deprecated.
> {code}
> [ERROR]
> testReadLandsatRecordsNoMatch(org.apache.hadoop.fs.s3a.select.ITestS3SelectLandsat)
> Time elapsed: 147.958 s <<< ERROR!
> java.io.IOException: java.lang.NoClassDefFoundError:
> software/amazon/eventstream/MessageDecoder
> at
> org.apache.hadoop.fs.s3a.select.SelectObjectContentHelper.select(SelectObjectContentHelper.java:75)
> at
> org.apache.hadoop.fs.s3a.WriteOperationHelper.lambda$select$10(WriteOperationHelper.java:660)
> at
> org.apache.hadoop.fs.store.audit.AuditingFunctions.lambda$withinAuditSpan$0(AuditingFunctions.java:62)
> at org.apache.hadoop.fs.s3a.Invoker.once(Invoker.java:122)
> {code}
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