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From mjwall <>
Subject [GitHub] accumulo pull request: 4148 inmemorymap counter
Date Mon, 28 Mar 2016 16:16:38 GMT
Github user mjwall commented on a diff in the pull request:
    --- Diff: test/src/test/java/org/apache/accumulo/test/ ---
    @@ -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
    + *
    + *
    + *
    + * 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 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.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 static org.junit.Assert.assertEquals;
    +import static;
    +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
    + * <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
In addition to NativeMapWrapper and DefaultMap,
    + * LocalityGroupMap was add in
    + *
    + * 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()) {
    --- End diff --
    So it would be preferred to ignore this IT if the libaccumulo library is not built instead
of failing?  I put this check in because the tests would pass even if you didn't have libaccumulo.
 The behavior of the InMemoryMap is to use non native maps and continue.

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