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https://issues.apache.org/jira/browse/ACCUMULO-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997167#comment-14997167
]
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_r44316590
--- Diff:
iterator-test-harness/src/main/java/org/apache/accumulo/iteratortest/IteratorTestUtil.java
---
@@ -0,0 +1,44 @@
+/*
+ * 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;
+
+import java.util.Objects;
+
+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.core.iterators.SortedMapIterator;
+import
org.apache.accumulo.core.iterators.system.ColumnFamilySkippingIterator;
+import org.apache.accumulo.iteratortest.testcases.IteratorTestCase;
+
+/**
+ * A collection of methods that are helpful to the development of {@link
IteratorTestCase}s.
+ */
+public class IteratorTestUtil {
+
+ public static SortedKeyValueIterator<Key,Value>
instantiateIterator(IteratorTestInput input) {
+ try {
+ return
Objects.requireNonNull(input.getIteratorClass()).newInstance();
+ } catch (InstantiationException | IllegalAccessException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ public static SortedKeyValueIterator<Key,Value>
createSource(IteratorTestInput input) {
+ return new ColumnFamilySkippingIterator(new
SortedMapIterator(Objects.requireNonNull(input).getInput()));
--- End diff --
> Storing the output of a source in a list or map without making a copy is
a common pitfall.
Ooo, that's a good one I didn't think to test. Sounds like a good idea to
implicitly test. I can also see a test that checks that Keys and values aren't
reused (with a reference check).
> 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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