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https://issues.apache.org/jira/browse/DRILL-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16039799#comment-16039799
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ASF GitHub Bot commented on DRILL-5325:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/808#discussion_r120497564
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/managed/SortMemoryManager.java
---
@@ -0,0 +1,506 @@
+/*
+ * 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
+ *
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ */
+package org.apache.drill.exec.physical.impl.xsort.managed;
+
+public class SortMemoryManager {
--- End diff --
Not sure how transferable the logic here is. This is, essentially, a
mathematical model of how memory is used by the sort/merge algorithm. Each
operator needs its own model, else we're back to using made up logic that does
not map to the actual code behavior.
For the most part, the numbers and algorithms are no longer "fuzzy."
Instead, they reflect actual code behavior as determined first by inspection,
then relentless QA testing. Any places where the estimates don't match reality
have resulted in bugs filed against the sort.
> Implement sub-operator unit tests for managed external sort
> -----------------------------------------------------------
>
> Key: DRILL-5325
> URL: https://issues.apache.org/jira/browse/DRILL-5325
> Project: Apache Drill
> Issue Type: Improvement
> Components: Tools, Build & Test
> Affects Versions: 1.11.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Fix For: 1.11.0
>
>
> Validate the proposed sub-operator test framework, by creating low-level unit
> tests for the managed version of the external sort.
> The external sort has a small number of existing tests, but those tests are
> quite superficial; the "managed sort" project found many bugs. The managed
> sort itself was tested with ad-hoc system-level tests created using the new
> "cluster fixture" framework. But, again, such tests could not reach deep
> inside the sort code to exercise very specific conditions.
> As a result, we spent far too much time using QA functional tests to identify
> specific code issues.
> Using the sub-opeator unit test framework, we can instead test each bit of
> functionality at the unit test level.
> If doing so works, and is practical, it can serve as a model for other
> operator testing projects.
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