DomGarguilo commented on code in PR #3228:
URL: https://github.com/apache/accumulo/pull/3228#discussion_r1278067213


##########
test/src/main/java/org/apache/accumulo/test/ExportTableCommandWithMultipleVolumesIT.java:
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@@ -0,0 +1,156 @@
+/*
+ * 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
+ *
+ *   https://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.accumulo.test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.File;
+import java.time.Duration;
+import java.util.Map;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import org.apache.accumulo.core.client.Accumulo;
+import org.apache.accumulo.core.client.AccumuloClient;
+import org.apache.accumulo.core.client.BatchWriter;
+import org.apache.accumulo.core.client.Scanner;
+import org.apache.accumulo.core.conf.Property;
+import org.apache.accumulo.core.data.Key;
+import org.apache.accumulo.core.data.Mutation;
+import org.apache.accumulo.core.data.Range;
+import org.apache.accumulo.core.data.Value;
+import org.apache.accumulo.core.metadata.MetadataTable;
+import org.apache.accumulo.core.metadata.schema.MetadataSchema;
+import org.apache.accumulo.core.security.Authorizations;
+import org.apache.accumulo.harness.AccumuloClusterHarness;
+import org.apache.accumulo.miniclusterImpl.MiniAccumuloConfigImpl;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.RawLocalFileSystem;
+import org.apache.hadoop.io.Text;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ExportTableCommandWithMultipleVolumesIT extends 
AccumuloClusterHarness {
+  private static final Logger log =
+      LoggerFactory.getLogger(ExportTableCommandWithMultipleVolumesIT.class);
+
+  Path v1, v2;
+
+  public static String[] row_numbers = "1,2,3,4,5,6,7,8,9,10".split(",");
+
+  String baseDirStr = "";
+  String baseDir2Str = "";
+  String originalVolume = "";
+  String secondVolume = "";
+
+  @Override
+  protected Duration defaultTimeout() {
+    return Duration.ofMinutes(1);
+  }
+
+  @Override
+  public void configureMiniCluster(MiniAccumuloConfigImpl cfg, Configuration 
hadoopCoreSite) {
+    File baseDir = cfg.getDir();
+
+    // get first volume name
+    baseDirStr = baseDir.toString();
+    String[] baseDirArray = baseDirStr.split("/");
+    originalVolume = baseDirArray[2];
+
+    // get second volume name
+    String[] baseDir2Array = baseDirArray;
+    baseDir2Array[2] = baseDir2Array[2] + "2";

Review Comment:
   I understand that new directories can be created by a test. I think the 
difference in this case is that the distcp files that are created use the root 
of the path (or rather the second index) to name those files:
   ```
   String keyValueString = entry.getKey().toString();
   String[] keyValueArray = keyValueString.split("/");
   String volumeName = keyValueArray[2];
   createDistcpFile(fs, exportDir, exportMetaFilePath, 
volumeFileMap.get(entry.getKey()), volumeName);
   ```
   
https://github.com/AlbertWhitlock/accumulo/blob/fced61f2479dea155610386a9ec6ae11a8a0cfb4/server/manager/src/main/java/org/apache/accumulo/manager/tableOps/tableExport/WriteExportFiles.java#L215
   
   So in the case of creating a temporary directory from the test, the distcp 
files would be created with the same name unless we have a way of creating 
directories with different subdirectories at the level at which the code above 
uses. That is what I was trying to convey in my previous comment, not that its 
impossible to create a directory from a test.



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