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https://issues.apache.org/jira/browse/CASSANDRA-16262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472002#comment-17472002
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Alex Petrov commented on CASSANDRA-16262:
-----------------------------------------
[patch|https://github.com/apache/cassandra/pull/1382]
This introduces several ways to test Cassandra with Harry.
1. Creating unit tests using the history builder
{code}
test(new SchemaGenerators.Builder("harry")
.partitionKeySpec(1, 5)
.clusteringKeySpec(1, 5)
.regularColumnSpec(1, 10)
.generator(),
historyBuilder -> {
historyBuilder.nextPartition()
.simultaneously()
.randomOrder()
.partitionDeletion()
.rangeDeletion()
.finish();
});
{code}
2. Generating SSTables
{code}
SSTableLoadingVisitor sstableVisitor = new SSTableLoadingVisitor(run,
1000);
LtsVisitor visitor = new GeneratingVisitor(run, sstableVisitor);
Set<Long> pds = new HashSet<>();
run.tracker.onLtsStarted((lts) -> {
pds.add(run.pdSelector.pd(lts, run.schemaSpec));
});
for (int i = 0; i < 1000; i++)
visitor.visit();
sstableVisitor.forceFlush(0);
{code}
3. "normal" Harry capabilities (i.e. generate data using visitors and validate
them using the model).
> 4.0 Quality: Coordination & Replication Fuzz Testing
> ----------------------------------------------------
>
> Key: CASSANDRA-16262
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16262
> Project: Cassandra
> Issue Type: Task
> Components: Test/fuzz
> Reporter: Caleb Rackliffe
> Assignee: Alex Petrov
> Priority: Normal
> Labels: pull-request-available
> Fix For: 4.x
>
>
> CASSANDRA-16180, CASSANDRA-16181, and CASSANDRA-15977 have largely focused on
> auditing the existing tests around coordination, replication, and
> read-repair, respectively. We've expanded existing test cases, added coverage
> around components that we've refactored along the way, and added in-JVM dtest
> upgrade tests where possible.
> What remains is verifying the distributed read and write paths in the face of
> common operational events, namely node restarts, bootstrapping, decommission,
> and cleanup. If we can find a way to simulate these events,
> [Harry|https://github.com/apache/cassandra-harry] seems like a good candidate
> to host the verification logic itself.
> To keep things simple initially, I would propose that we start by testing
> simple read-only and write-only workloads (the former without read repair).
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