Hoss Man created SOLR-8849: ------------------------------ Summary: ChaosMonkey should cuase chaos in a more reproducible manner Key: SOLR-8849 URL: https://issues.apache.org/jira/browse/SOLR-8849 Project: Solr Issue Type: Test Reporter: Hoss Man
Looking into the ChaosMonkey code a bit, and it seems like this class -- particularly the way {{monkeyThread}} is defined -- uses randomness in a way that makes it extremely unlikely that it will ever create reproducible failures. Obviously in any test where there are multiple concurrent threads, timing issues might prevent test reproducibility -- but in this case, even the sequence of "chaos" actions the monkeyThread takes won't be reproducible if anyother concurrent test thread accesses {{LuceneTestCase.random()}} ... {code} public void run() { while (!stop) { try { Random random = LuceneTestCase.random(); // ... lots of stuff using random, or calling methods that use LuceneTestCase.random() directly {code} It seems like it would be a lot better if ChaosMonkey's constructor created it's own private {{Random chaosRand}} using {{LuceneTestCase.random()}} as a seed, and then used {{chaosRand}} to make all random choices in it's methods. That way at least the sequence of chaotic operations made by ChaosMonkey would be consistent for a given test seed, even if the exact timing/interleaving of those operations relative to other operations by other threads couldn't be garunteed. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org