Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/50#discussion_r47257077
--- 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 --
> is the purpose to test only system iterators, as opposed to generic tests
to check user-defined iterators? That makes more sense.
Yep. First and foremost, my goal was to provide a framework for users to
test iterators without running them through Accumulo (since it's often hard to
know when you're hitting some of the edge cases). However, I can totally see it
growing into a framework to catch "common pitfalls" like you outlined :)
> Some users may define iterators that expect a column family, whereas all
the tests seek with Collections.<ByteSequence> emptySet(), false
Yeah, this is something I'm not quite sure how to handle colfams (I'm
throwing that into the same bucket as the compaction stuff and more that Keith
pointed out).
> If we make this public API, we should state that user iterators do not
necessarily need to pass all the IteratorTestCases, or at least that failing an
IteratorTestCase does not imply a bug.
Very good point. We don't really have an "evolving" annotation. Maybe we
just talk about it and the lack of public API declares it as evolving
intrinsically?
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