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Posted to commits@cassandra.apache.org by mc...@apache.org on 2021/11/18 07:11:21 UTC

[cassandra-website] branch asf-staging updated: generated for e35418ad9542cc50f61e9bcb3610a5a457657bd3

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mck pushed a commit to branch asf-staging
in repository https://gitbox.apache.org/repos/asf/cassandra-website.git


The following commit(s) were added to refs/heads/asf-staging by this push:
     new 58b29b0  generated for e35418ad9542cc50f61e9bcb3610a5a457657bd3
58b29b0 is described below

commit 58b29b03c1002d04d573659ccc0be1ffd3818b7b
Author: mck <mc...@apache.org>
AuthorDate: Thu Nov 18 08:09:55 2021 +0100

    generated for e35418ad9542cc50f61e9bcb3610a5a457657bd3
---
 content/_/blog.html                                |  25 +
 ...and-Verification-Tool-for-Apache-Cassandra.html | 923 +++++++++++++++++++++
 content/search-index.js                            |   2 +-
 content/sitemap-Cassandra.xml                      | 840 +++++++++----------
 content/sitemap-_.xml                              | 128 +--
 5 files changed, 1435 insertions(+), 483 deletions(-)

diff --git a/content/_/blog.html b/content/_/blog.html
index 1a7629c..480afd1 100644
--- a/content/_/blog.html
+++ b/content/_/blog.html
@@ -185,6 +185,31 @@
 <div class="content">
 <div class="openblock card-header">
 <div class="content">
+<h3 id="harry-an-open-source-fuzz-testing-and-verification-tool-for-apache-cassandra" class="discrete">Harry, an Open Source Fuzz Testing and Verification Tool for Apache Cassandra</h3>
+<h4 id="november-18-2021" class="discrete">November 18, 2021</h4>
+</div>
+</div>
+<div class="openblock card-content">
+<div class="content">
+<div class="paragraph">
+<p>Introducing Harry, an Open Source fuzz testing and verification tool for Apache Cassandra that can combine properties of stress- and integration-testing tools. Harry can generate data for an arbitrary schema, execute data modification queries against the cluster, track the progress of operation execution, and make sure that responses to read queries are correct\
+.</p>
+</div>
+<div class="openblock card-btn card-btn--blog">
+<div class="content">
+<div class="paragraph btn btn--alt">
+<p><a href="blog/Harry-an-Open-Source-Fuzz-Testing-and-Verification-Tool-for-Apache-Cassandra.html" class="page">Read More</a></p>
+</div>
+</div>
+</div>
+</div>
+</div>
+</div>
+</div>
+<div class="openblock card shadow relative test">
+<div class="content">
+<div class="openblock card-header">
+<div class="content">
 <h3 id="inside-cassandra-an-interview-with-marcel-birkner-at-instana" class="discrete">Inside Cassandra: an interview with Marcel Birkner at Instana</h3>
 <h4 id="november-17-2021" class="discrete">November 17, 2021</h4>
 </div>
diff --git a/content/_/blog/Harry-an-Open-Source-Fuzz-Testing-and-Verification-Tool-for-Apache-Cassandra.html b/content/_/blog/Harry-an-Open-Source-Fuzz-Testing-and-Verification-Tool-for-Apache-Cassandra.html
new file mode 100644
index 0000000..c6db3ba
--- /dev/null
+++ b/content/_/blog/Harry-an-Open-Source-Fuzz-Testing-and-Verification-Tool-for-Apache-Cassandra.html
@@ -0,0 +1,923 @@
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+        <div class="hero hero--home grad">
+            <div class="eye"></div>
+            <div id="home-content" class="text-center flex flex-center flex-column relative z2 ma-xlarge">
+                <h1>Harry, an Open Source Fuzz Testing and Verification Tool for Apache Cassandra</h1>
+                <h3>November 18, 2021 | Alex Petrov</h3>
+            </div>
+        </div>
+        <div id="blog-post" class="flex-center py-large arrow">
+            <div class="blog-breadcrumb mb-medium">
+                <div class="inner inner--narrow">
+                    <a href="/_/blog.html">« Back to the Apache Cassandra Blog</a>
+                </div>
+            </div>
+            <div class="post-content">
+                <div class="inner inner--narrow">
+                    <div id="preamble">
+<div class="sectionbody">
+<div class="paragraph">
+<p>Over the years working on Apache Cassandra while writing tests or
+trying to reproduce the issues, I’ve always found myself repeating the
+same procedure over and over again: creating schema, writing loops
+generating data, then either manually reconciling it to check the
+results, or comparing the result set against some predetermined
+expected result. Not only is this approach tedious and time-consuming,
+but it also does not scale: if some set of operations work for one
+schema, there’s no way to know if it will also work for any arbitrary
+schema, whether it will work if operations are executed in a different
+order, or if operations themselves are slightly different.</p>
+</div>
+<div class="paragraph">
+<p>While preparing Apache Cassandra for 4.0 release, we’ve made extensive
+progress in how we test. The new in-tree in-JVM distributed test
+framework enables us to easily write tests that exercise coordinated
+query execution code paths while giving us flexibility and control
+that was previously offered only by CQLTester, a tool for exercising
+node-local query paths. Many subsystems were audited and covered with
+tests. Cassandra users tried the new version out in their clusters and
+reported their findings. All of these things are useful and important,
+but we still needed a tool that would give us the same or higher
+degree of confidence for every commit so that we could know that the
+database is working as expected, not only for an exact set of
+operations that exercised by unit and integration tests, but
+potentially for any use-case and combination of operations under
+circumstances comparable to production.</p>
+</div>
+<div class="paragraph">
+<p>This all led us to develop Harry, a tool that can combine properties
+of stress- and integration-testing tools. Harry is a tool that can
+generate data for an arbitrary schema, execute data modification
+queries against the cluster, track the progress of operation
+execution, and make sure that responses to read queries are correct.</p>
+</div>
+<div class="paragraph">
+<p>After reading this post, you will understand:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>how Harry generates the data</p>
+</li>
+<li>
+<p>how Harry performs verification</p>
+</li>
+<li>
+<p>which properties values generated by  Harry make verification not only possible but also efficient.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>The primary audience for this post is Cassandra contributors, so you
+will need to be familiar with Apache Cassandra and its tooling.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="fuzz-testing"><a class="anchor" href="#fuzz-testing"></a>Fuzz testing</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Since most of the bugs are reproduced by taking a sequence of actions
+following some pattern, we need to specify what actions can be used to
+lead to a given state. However, there’s a lot of flexibility regarding
+which values exactly are written in specific columns.</p>
+</div>
+<div class="paragraph">
+<p>For example, if we look at
+<a href="https://issues.apache.org/jira/browse/CASSANDRA-16453" target="_blank" rel="noopener">CASSANDRA-16453</a>,
+which was reproduced using Harry. Code to reproduce the issue with
+in-JVM DTests looks something like this:</p>
+</div>
+<div class="listingblock">
+<div class="title">Repro.java</div>
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">try (Cluster cluster = init(builder().withNodes(2).start()))
+{
+    cluster.schemaChange(withKeyspace("CREATE TABLE distributed_test_keyspace.table_0 (pk0 bigint,ck0 bigint,regular0 bigint,regular1 bigint,regular2 bigint, PRIMARY KEY (pk0, ck0)) WITH  CLUSTERING ORDER BY (ck0 ASC);"));
+    cluster.coordinator(1).execute("DELETE FROM distributed_test_keyspace.table_0 USING TIMESTAMP 1 WHERE pk0=1 AND ck0&gt;2;", ConsistencyLevel.ALL);
+    cluster.get(2).executeInternal("DELETE FROM distributed_test_keyspace.table_0 USING TIMESTAMP 1 WHERE pk0=1;");
+    cluster.coordinator(1).execute("SELECT * FROM distributed_test_keyspace.table_0 WHERE pk0=1 AND ck0&gt;=1 AND ck0&lt;3;",
+                                   ConsistencyLevel.ALL, 1L, 1L, 3L);
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>You can see that, at first glance, there are only three things that
+that are important to reproduce the issue:</p>
+</div>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>The table has to have at least one clustering column</p>
+</li>
+<li>
+<p>Two actions are executed against the cluster: a range deletion, and a partition deletion</p>
+</li>
+<li>
+<p>Both operations have the same timestamp</p>
+</li>
+</ol>
+</div>
+<div class="paragraph">
+<p>The rest of the details do not matter: size of the cluster, number of
+replicas, clustering order, consistency level with which operations
+are executed, types of clustering keys and values written, and so on.</p>
+</div>
+<div class="paragraph">
+<p>The simplest way to cover a case like this with a test is to hardcode
+the schema and then execute a partition deletion and a range deletion
+hardcoding the values, much as we did above. This might work, but
+there’s still a chance that the proposed fix may not work for some
+other schema or some combination of values.</p>
+</div>
+<div class="paragraph">
+<p>To improve the situation, we can express the test in more abstract
+terms and, instead of writing a repro using specific statements, we
+can only use the constraints we’ve specified above:</p>
+</div>
+<div class="listingblock">
+<div class="title">HarryDsl.java</div>
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">test(new SchemaGenerators.Builder("harry")
+                         .partitionKeySpec(1, 5)
+                         .clusteringKeySpec(1, 5)
+                         .regularColumnSpec(1, 10)
+                         .generator(),
+     historyBuilder -&gt; {
+         historyBuilder.nextPartition()
+                       .simultaneously()
+                       .randomOrder()
+                       .partitionDeletion()
+                       .rangeDeletion()
+                       .finish();
+     });</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>This spec can be used to generate clusters of different sizes,
+configured with different schemas, executing the given sequence of
+actions both in isolation and combined with other randomly generated
+ones, with failure-injection. Best of all, this test will <em>not only</em>
+ensure that such a sequence of actions does not produce an exception
+but also ensures that a cluster will respond with correct results to
+<em>any</em> allowed read query.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="generating-data"><a class="anchor" href="#generating-data"></a>Generating data</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Generating random values and sequences of actions and reconciling them
+during verification is in itself not a difficult task. Making this
+process time- and memory-efficient is what makes it more interesting.</p>
+</div>
+<div class="paragraph">
+<p>For space efficiency, the log of actions generated using Harry is not
+kept in memory or saved anywhere on disk since any generated operation
+can be reproduced from its sequence number. In Harry, a sequence
+number consists of two parts: the logical timestamp (LTS, which has
+1-1 mapping to real-time timestamp), and the modification ID, which
+allows having multiple uniquely identifiable operations for each
+logical timestamp. For the sake of simplicity, we’ll just say that
+each operation is represented by its sequence number / LTS.</p>
+</div>
+<div class="paragraph">
+<p>In the example above, the operation order is determined by the seed
+for the given run. Let’s say that partition deletion is executed
+first. To produce a <code>DELETE</code> statement from it, we now need to
+generate a partition key and get a timestamp. Similarly, to generate a
+range deletion, we will need a partition key, two clustering keys that
+will serve as lower and higher bounds for the range tombstone, and a
+timestamp.</p>
+</div>
+<div class="paragraph">
+<p>Using the sequence number and knowing the operation type, we can now
+produce <em>descriptors</em> that are used as the compact internal
+representation of data in Harry. No matter how many parts it consists
+of, any partition key is represented by a single <code>long</code>. The same is
+true for the clustering keys: any clustering key, single-part or
+composite, is represented using a single <code>long</code> descriptor. If we were
+to generate an <code>INSERT</code> or <code>UPDATE</code> operation, each value for a
+regular or a static column would have its own descriptor since we
+would want to distinguish between two writes made by two different
+operations.</p>
+</div>
+<div class="paragraph">
+<p>To summarise, every operation has a sequence number, which determines
+everything that is required to fully reproduce this operation,
+including descriptors that we will later use to generate values
+themselves:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>partition deletion only has a partition descriptor</p>
+</li>
+<li>
+<p>range deletion has a partition descriptor and two clustering descriptors, specifying tombstone bounds</p>
+</li>
+<li>
+<p>insert or update operation has a partition descriptor, a clustering descriptor, and a set of value descriptors, one for each regular and static column.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>Using descriptors rather than specific values for verification can be
+extremely useful for efficiency. Instead of comparing potentially
+large values, we could just compare two longs that uniquely identify
+them. This means that we have to have a way to not <em>only</em> generate a
+value from the descriptor, but <em>also</em> to compute a descriptor the
+value was generated from.</p>
+</div>
+<div class="paragraph">
+<p>In Harry, we call such a generator <code>Bijection&lt;T&gt;</code>, and every bijection
+can <em>inflate</em> a descriptor into the value of type <code>T</code>. Then <em>deflate</em>
+the value of type <code>T</code> back into the descriptor where it was originally
+generated.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="validating-results"><a class="anchor" href="#validating-results"></a>Validating results</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Applying a predetermined sequence of operations against a single
+partition produces some partition state. Knowing the status of
+execution of each operation, we can deterministically determine the
+state of each node in the cluster and validate the results of
+execution of any <code>SELECT</code> query.</p>
+</div>
+<div class="paragraph">
+<p>Since we can represent any operation as a sequence of descriptors, we
+know the order of operations (since the timestamp determines it). We
+can assume we know the status of each operation (whether or not it has
+been executed against some node), and we can deterministically produce
+partition state for any given point in time. Partition state is
+nothing but a sorted map, where the key is a clustering descriptor,
+and value is a row state. Row state, in this case, holds value
+descriptors for each column, and timestamps where operations were
+executed:</p>
+</div>
+<div class="listingblock">
+<div class="title">PartitionState.java</div>
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class PartitionState implements Iterable&lt;RowState&gt; {
+    long partitionDescriptor;
+    NavigableMap&lt;Long, RowState&gt; rowStates;
+}
+
+public static class RowState {
+    long[] valueDescriptors;
+    long[] logicalTimestamps;
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Similarly, since any value written to the database is generated using
+a bijection, we can produce the partition state from the result set by
+deflating every value returned by the database into the descriptor
+that it was generated from.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="generating-descriptors"><a class="anchor" href="#generating-descriptors"></a>Generating Descriptors</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Reproducible operation sequences can be generated from a set of rules
+that determines what the sequence is going to look like. For example,
+we can specify probability distributions for each operation type or
+give operations relative weights, which can be turned into the
+distribution internally later. Configuration for an insert / update /
+delete workload with a probability of an insert operation (100/251)
+being twice as high as a probability of a row deletion (50/251), and
+ten times more probable than a partition deletion (1/251), would look
+like:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>INSERT: 100
+UPDATE: 100
+DELETE_ROW: 50
+DELETE_PARTITION: 1</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Since each operation is uniquely determined by its sequence number, we
+can deterministically compute its operation type by taking these
+probability distributions. One way to do this is by using PCG random
+number generator, which has some useful properties we’re going to use
+for generating our pseudorandom values.</p>
+</div>
+<div class="paragraph">
+<p>If you’d like to learn more about the mathematical underpinnings of
+PCG, you should read this paper
+(<a href="https://www.pcg-random.org/pdf/hmc-cs-2014-0905.pdf" target="_blank" rel="noopener">https://www.pcg-random.org/pdf/hmc-cs-2014-0905.pdf</a>). However,
+to be able to use PCG, it is not necessary to know any of the
+internals. We need a random number generator that will have the
+following properties:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Long period: sequence of numbers it produces does not repeat
+frequently; ideally the period should be 2^64 when generating a
+random number from 64 bits of entropy</p>
+</li>
+<li>
+<p>Stream selection: the ability to produce different random
+sequences from the same seed, identified by some stream id.</p>
+</li>
+<li>
+<p>Addressability: any number produced by the generator can be
+reproduced from the seed and its sequence number. Ideally, we’d
+like to have methods such as <code>long randomNumber(long
+sequenceNumber, long stream)</code> and <code>long sequenceNumber(long
+randomNumber, long stream)</code>. In other words, we should be able to
+determine the sequence number of the random number in the given
+stream. Using this method, we can also determine <code>distance(long x,
+long y)</code> : how many random numbers we should skip to get <code>y</code> after
+seeing <code>x</code>.</p>
+</li>
+<li>
+<p>Walkability: the ability to produce a number immediately following
+<code>long next(long randomNumber, long stream)</code> or preceding <code>long
+prev(long randomNumber, long stream)</code> the given random number in
+the random sequence.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>You might have noticed that there are two ways to achieve the same
+thing. We can get a pseudorandom number from some number known by the
+system by using <code>randomNumber(i, stream)</code> and by using <code>prev(i,
+stream)</code>. Both variants are valid, and both operations can be
+inverted. We have a slight preference toward using <code>prev</code>, since its
+inverse can be computed in constant time.</p>
+</div>
+<div class="paragraph">
+<p>These properties allow us to reproduce partition state from just
+configuration (i.e., known distributions, schema, size of the
+partition, etc) and a seed:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Partition descriptor for <code>N</code> th operation can be picked as <code>M</code> th
+random number in the stream of partition descriptors, and the
+relation between <code>N</code> and <code>M</code> is determined by the chosen pattern
+for visiting partitions.</p>
+</li>
+<li>
+<p>Clustering descriptor for <code>N</code> th operation can be picked as <code>M</code> th
+random number in the stream of clustering descriptors <strong>for the
+given partition</strong>, where maximum <code>M</code> is determined by the maximum
+partition size, so there can be no more than <code>max(M)</code> rows in any
+generated partition.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>One of the simplest useful ways to represent a pattern for picking a
+descriptor from the sequence is to use a sliding window. The sliding
+window begins with a preset number of items in it and allows to visit
+each item in the current window one or several times in a round-robin
+fashion. After this, it cycles one of the items out and adds a new one
+in its place.</p>
+</div>
+<div class="paragraph">
+<p>Once operation type, partition descriptor, and clustering descriptors
+are determined, all we have left to cover is how to generate value
+descriptors for <code>INSERT</code> and <code>UPDATE</code> operations. Value descriptor for
+a column is uniquely identified by its sequence number and is bound by
+partition descriptor, clustering descriptor, and column.</p>
+</div>
+<div class="paragraph">
+<p>To summarise, all operations in Harry are deterministic and are
+represented using their descriptors. Descriptors can be computed
+hierarchically using the following rules:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Partition descriptor is picked from the <em>stream</em> of partition descriptors. Its position in that stream is determined by some rule (for example, a sliding window):</p>
+</li>
+</ul>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">long pd = rng.randomNumber(positionFor(sequenceNumber), PARTITION_DESCRIPTOR_STREAM_ID)</code></pre>
+</div>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Clustering descriptor is picked from the <em>stream</em> of clustering descriptors <strong>for the given partition</strong>.</p>
+</li>
+</ul>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">long cd = rng.prev(positionInPartition, pd);</code></pre>
+</div>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Value descriptor is picked from the <em>stream</em> of descriptors identified by which partition, clustering, and column the value belongs to:</p>
+</li>
+</ul>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">long vd = rng.randomNumber(sequenceNumber, pd ^ cd ^ col);</code></pre>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="inflation-and-deflation"><a class="anchor" href="#inflation-and-deflation"></a>Inflation and Deflation</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>We’ve mentioned before that one reason Harry state is so compact and
+can be validated so efficiently is because every value read from the
+database can be traced back to the descriptor it was generated
+from. To achieve this, we generate all values using order-preserving
+bijections. In other words, for any value generated from a descriptor,
+it should be possible to quickly find a descriptor this value was
+generated from, and two values generated from two distinct descriptors
+should sort the same as descriptors themselves.</p>
+</div>
+<div class="paragraph">
+<p>Implementing an order-preserving bijection for 64-bit longs is trivial
+and can be achieved by using an identity function. Essentially, any
+long descriptor <em>is</em> the value it represents:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">long inflate(long descriptor) {
+  return descriptor;
+}
+
+long deflate(long value) {
+  return value;
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>There are many ways to make a bijection for strings. One of the ways
+to do it is to have a set of 256 short strings of the same length in a
+sorted array. When inflating a 64-bit long descriptor into the string,
+we’ll be iterating over these 64 bits, taking 8 bits (one byte) at a
+time, using the value of this byte as an index in an array of 256
+strings.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">String inflate(long descriptor) {
+    StringBuilder builder = new StringBuilder();
+
+    for (int i = 0; i &lt; Long.BYTES; i++) {
+            int idx = getByte(descriptor, i);
+            builder.append(nibbles[idx]);
+    }
+    return builder.toString();
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>One thing we should take into account here is that strings are
+compared byte-wise, while longs use signed comparison. To make sure
+generated strings have the same order as descriptors, we need to XOR
+the sign bit.</p>
+</div>
+<div class="paragraph">
+<p>Since any two strings produced by this generator will be unique, and
+we can produce at most 2^64 values using this generator, to generate
+longer strings we do not even need larger nibbles. We can append
+random data of arbitrary length to the end of the string. This does
+not change the order since it is determined by the prefix generated
+from nibbles that is unique to each value.</p>
+</div>
+<div class="paragraph">
+<p>Such simple bijections can represent data types used for regular and
+static columns. We’ve previously mentioned that partition and
+clustering keys are also represented using 64-bit
+descriptors. Partition and clustering keys are composite: they consist
+of multiple distinct parts. One way to implement bijection for a
+composite type is to “slice” 64 bits of entropy into smaller chunks,
+each chunk giving some entropy to generate a different part of the
+key. Each slice is then inflated using a bijection that corresponds to
+the part of the key it represents. To convert the value back to the
+descriptor, we must deflate each part of the key and then “stitch” the
+values back together into a 64-bit descriptor.</p>
+</div>
+<div class="paragraph">
+<p>To summarise, key generators are just bijections that can generate
+multiple values for a single 64-bit descriptor instead of one. A
+simplified and generalized version of such bijection may look
+something like this:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">Object[] inflate(long descriptor) {
+  long[] slices = slice(descriptor);
+  Object[] key = new Object[slices.length];
+  for (int i = 0; i &lt; slices.length; i++) {
+     key[i] = children[i].inflate(slices[i]);
+  }
+  return key;
+}
+
+long deflate(Object[] value) {
+  long[] slices = new long[value.length];
+  for (int i = 0; i &lt; value.length; i++) {
+     slices[i] = children[i].deflate(value[i]);
+  }
+  return stitch(slices);
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Values generated by key generators preserve the order of descriptors
+they were generated from, which allows efficiently checking the order
+of results, comparing clustering descriptors, and validating range
+deletions.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="putting-it-all-together"><a class="anchor" href="#putting-it-all-together"></a>Putting it all together</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>In this post, we’ve learned how the various parts of Harry work,
+starting with how to reproduce a sequence of operations up to how the
+values are generated. Using this information, we can create a
+quiescent model checker that can validate the state of the database in
+the absence of in-flight operations, assuming we know the state of all
+operations before this moment.</p>
+</div>
+<div class="paragraph">
+<p>As we’ve discussed, Harry is working with reproducible histories of
+operations, where the following information identifies each operation:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">class Operation {
+  long lts; // logical timestamp of the operation
+  long pd;  // partition descriptor, derived from LTS
+  long cd;  // clustering descriptor, derived from LTS and PD
+  long OperationKind; // operation type, derived from LTS and PD
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Now, all we need to do is to produce a sequence of operations. For example, each operation with <code>INSERT</code> kind is going to be represented by:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">class Insert {
+   long lts;   // logical timestamp
+   long pd;    // partition descriptor
+   long cd;    // clustering descriptor
+   long[] vds; // value descriptors for each column
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>We can compile this information into an INSERT statement by inflating
+partition, clustering, and value descriptors, and deriving the
+real-time timestamp from the logical timestamp. This statement can
+then be executed against the system under test (our Cassandra
+cluster).</p>
+</div>
+<div class="paragraph">
+<p>We know from the history of operations which partitions were visited,
+and which operations were executed against them. To validate the state
+of any given partition, all we need to do is to query the database to
+retrieve partition state from the database, deflate every row returned
+in the results: deflate all clustering keys into clustering
+descriptors, and values into corresponding value descriptors,
+producing internal PartitionState.</p>
+</div>
+<div class="paragraph">
+<p>To verify that this partition state is also correct, we replay the
+sequence of operations again. But instead of going all the way to the
+generated INSERT statement, we operate with only descriptors and apply
+operations sequentially to the PartitionState following usual
+Cassandra reconciliation rules (i.e. last-write-wins, partition
+tombstone &gt; tombstone &gt; write), compute logical timestamps and value
+descriptors for each row.</p>
+</div>
+<div class="paragraph">
+<p>Now, having two partition states: one “deflated” from the result set
+returned by the system under test and one “inflated” from the logical
+timestamp, we can directly compare them. If there are any
+inconsistencies between the two sets, we can conclude there has been
+an error.</p>
+</div>
+<div class="paragraph">
+<p>Validating query results by reproducing the sequence of events is more
+efficient than working with full operation logs holding all values for
+every operation executed against the database state. This process can
+be made even more efficient by validating rows individually while
+having enough state in memory to validate a single row.</p>
+</div>
+<div class="paragraph">
+<p>Since implementing other Cassandra features, such as partition
+deletions, writes without primary key liveness, static columns, column
+deletions, etc., do not require any additional information, and
+follows the same rules, for the sake of brevity, it is not covered in
+this post.</p>
+</div>
+<div class="paragraph">
+<p>Quiescent checker is a very useful tool and can validate data sets
+generated by sequential or concurrent runners, as long as the state of
+each operation is known at the moment of validation. Since we simply
+replay the sequence of events to reproduce the state, we can not have
+any events whose state is unknown to the system.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="closing-words"><a class="anchor" href="#closing-words"></a>Closing words</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Harry is a tool that allows the testing of databases in ways we
+weren’t able to before. Instead of creating test cases expressed in
+specific schemas and statements, it enables us to describe sequences
+of events we’d like tested and generate schemas and possible
+interleavings of statements corresponding to given
+specifications. Creating exhaustive test suites can take a lot of
+time, and we can have contributor creativity poured into patches and
+features, not into test examples. This approach also allows testing
+different features in combination and checking old behaviors in the
+presence of new ones without explicitly creating new tests.</p>
+</div>
+<div class="paragraph">
+<p>That said, integration testing is not always enough, and often we do
+not know which areas of the codebase can be problematic. Harry can be
+helpful here, too, since it will generate data, execute the workload
+against the system and validate the results. Contributors can focus on
+implementing test scenarios such as behavior in presence of unexpected
+failures, cluster expansions, or node replacements.</p>
+</div>
+<div class="paragraph">
+<p>Harry is a productivity tool that encapsulates the properties of a
+stress test and a model checker, allowing us to find issues and
+improve the quality of Cassandra in ways that were not possible
+before.</p>
+</div>
+</div>
+</div>
+                </div>
+            </div>
+        </div>
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index 79f5a7a..7c5e00b 100644
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