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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-626) create an iterator fuzz tester
Date Thu, 10 Dec 2015 17:17:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051276#comment-15051276
] 

ASF GitHub Bot commented on ACCUMULO-626:
-----------------------------------------

Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/50#discussion_r47255171
  
    --- Diff: iterator-test-harness/src/main/java/org/apache/accumulo/iteratortest/testcases/DeepCopyTestCase.java
---
    @@ -0,0 +1,63 @@
    +/*
    + * 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.iteratortest.testcases;
    +
    +import java.io.IOException;
    +import java.util.Collections;
    +import java.util.TreeMap;
    +
    +import org.apache.accumulo.core.data.ByteSequence;
    +import org.apache.accumulo.core.data.Key;
    +import org.apache.accumulo.core.data.Value;
    +import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
    +import org.apache.accumulo.iteratortest.IteratorTestInput;
    +import org.apache.accumulo.iteratortest.IteratorTestOutput;
    +import org.apache.accumulo.iteratortest.IteratorTestUtil;
    +import org.apache.accumulo.iteratortest.environments.SimpleIteratorEnvironment;
    +
    +/**
    + * Test case that verifies that an iterator can use the generated instance from {@code
deepCopy}.
    + */
    +public class DeepCopyTestCase extends OutputVerifyingTestCase {
    +
    +  @Override
    +  public IteratorTestOutput test(IteratorTestInput testInput) {
    +    final SortedKeyValueIterator<Key,Value> skvi = IteratorTestUtil.instantiateIterator(testInput);
    +    final SortedKeyValueIterator<Key,Value> source = IteratorTestUtil.createSource(testInput);
    +
    +    try {
    +      skvi.init(source, testInput.getIteratorOptions(), new SimpleIteratorEnvironment());
    +
    +      SortedKeyValueIterator<Key,Value> copy = skvi.deepCopy(new SimpleIteratorEnvironment());
    --- End diff --
    
    Thanks for taking a look, Dylan!
    
    > call deepCopy in the middle of an iteration, in addition to the beginning after init()
but before any next() calls
    
    Yeah, there are lots of good tests we can do around deepCopy. I'll see if I can add one
for this specific case. Please feel free to send a PR if you definitely want to see this in
the initial changeset :)
    
    >  Some iterators may do this in order to "save" the iteration at a certain point.
    
    But that's not something the "system" does, is it? I can see the value, but I'm not sure
if that's something that would happen through "normal" Accumulo use.


> create an iterator fuzz tester
> ------------------------------
>
>                 Key: ACCUMULO-626
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-626
>             Project: Accumulo
>          Issue Type: New Feature
>          Components: test
>            Reporter: Eric Newton
>            Assignee: Josh Elser
>
> Users often write iterators without fully understanding its limits and lifetime. Accumulo
should have an iterator fuzz-tester which will take user data and run the iterator under extreme
conditions.  For example, it should re-create and re-seek the iterator with every key returned.
 It could automatically compare results of such a run with the naive run, which seeks to the
beginning and scans all the data.



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