Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/82#discussion_r57575112
--- Diff: test/src/test/java/org/apache/accumulo/test/InMemoryMapIT.java ---
@@ -0,0 +1,319 @@
+/*
+ * 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.accumulo.test;
+
+import com.google.common.collect.ImmutableSet;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.apache.accumulo.core.data.ArrayByteSequence;
+import org.apache.accumulo.core.data.ByteSequence;
+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.iterators.SortedKeyValueIterator;
+import org.apache.accumulo.test.functional.NativeMapIT;
+import org.apache.accumulo.tserver.InMemoryMap;
+import org.apache.accumulo.tserver.MemKey;
+import org.apache.accumulo.tserver.NativeMap;
+import org.apache.hadoop.io.Text;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Integration Test for https://issues.apache.org/jira/browse/ACCUMULO-4148
+ * <p>
+ * User had problem writing one Mutation with multiple KV pairs that had
the same key. Doing so should write out all pairs in all mutations with a
unique id. In
+ * typical operation, you would only see the last one when scanning. User
had a combiner on the table, and they noticed that when using InMemoryMap with
+ * NativeMapWrapper, only the last KV pair was ever written. When
InMemoryMap used DefaultMap, all KV pairs were added and the behavior worked as
expected.
+ *
+ * This IT inserts a variety of Mutations with and without the same KV
pairs and then inspects result of InMemoryMap mutate, looking for unique id
stored with
+ * each key. This unique id, shown as mc= in the MemKey toString, was
originally used for scan Isolation. Writing the same key multiple times in the
same
+ * mutation is a secondary use case, discussed in
https://issues.apache.org/jira/browse/ACCUMULO-227. In addition to
NativeMapWrapper and DefaultMap,
+ * LocalityGroupMap was add in
https://issues.apache.org/jira/browse/ACCUMULO-112.
+ *
+ * This test has to be an IT in accumulo-test, because libaccumulo is
built in 'integration-test' phase of accumulo-native, which currently runs
right before
+ * accumulo-test. The tests for DefaultMap could move to a unit test in
tserver, but they are here for convenience of viewing both at the same time.
+ */
+public class InMemoryMapIT {
+
+ private static final Logger log =
LoggerFactory.getLogger(InMemoryMapIT.class);
+
+ @Rule
+ public TemporaryFolder tempFolder = new TemporaryFolder(new
File(System.getProperty("user.dir") + "/target"));
+
+ @BeforeClass
+ public static void ensureNativeLibrary() throws FileNotFoundException {
+ File nativeMapLocation = NativeMapIT.nativeMapLocation();
+ log.debug("Native map location " + nativeMapLocation);
+ NativeMap.loadNativeLib(Collections.singletonList(nativeMapLocation));
+ if (!NativeMap.isLoaded()) {
+ fail("Missing the native library from " +
nativeMapLocation.getAbsolutePath() + "\nYou need to build the libaccumulo
binary first. "
+ + "\nTry running 'mvn clean install -Dit.test=InMemoryMapIT
-Dtest=foo -DfailIfNoTests=false -Dfindbugs.skip -Dcheckstyle.skip'");
+ // afterwards, you can run the following
+ // mvn clean verify -Dit.test=InMemoryMapIT -Dtest=foo
-DfailIfNoTests=false -Dfindbugs.skip -Dcheckstyle.skip -pl :accumulo-test
--- End diff --
The Maven reactor should be smart enough to pick up artifacts from a
previous module in the same execution. The only time this wouldn't work is if
you `cd test` first, but it doesn't look like you're actually doing this (or,
your command would work just fine from the root dir of the project).
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