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https://issues.apache.org/jira/browse/CASSANDRA-21462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099898#comment-18099898
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Jon Haddad commented on CASSANDRA-21462:
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I should mention, the randomized test classes
(RandomDifferentialCompactionTest, BtiRandomDifferentialCompactionTest) don't
hardcode their example count or seed — both are read from system properties
with sane small defaults, so they run fast in normal CI but can be scaled way
up for a dedicated bug hunt:
* -Dcassandra.test.differential.examples=N — how many random schema+workload
examples to generate and run (default 10). Each example is a fresh random
schema (via QuickTheories) and a fresh random multi-round mutation workload
against it, compacted through both the iterator and cursor paths and compared
byte-for-byte.
* -Dcassandra.test.differential.seed=N — pins the run to a single specific
seed as example 0, for reproducing one exact failure instead of soaking.
These are how I've found all the issues in the epic.
> Add byte for byte test harness to detect and resolve cursor deviations from
> iterator path
> -----------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21462
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21462
> Project: Apache Cassandra
> Issue Type: Sub-task
> Components: Local/Compaction
> Reporter: Jon Haddad
> Assignee: Jon Haddad
> Priority: High
> Fix For: 6.0
>
>
> This issue addresses various deviations and inconsistencies with the cursor
> path by introducing tests that verify both the old iterator path and the new
> cursor path generate the same outputs given the same inputs. It also fixes
> various issues found in the process of creating this test system that
> resulted in corruption or incorrect values being carried into the resulting
> SSTable.
> It adds a test that uses the JVM's internal memory tracking to assert that we
> do NOT do unnecessary allocations in the cursor path that should guard
> against future regressions, and fixes an unnecessary enum allocation.
> It does NOT add support for BTI, multi-cell columns, counters, etc.
>
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