How can I see the number of rollbacks in my STM in Clojure?

Question

How can I see the number of rollbacks in my STM in Clojure?

Answer 1

If you're feeling frisky, you could hack the Clojure source and rebuild (it's easy to rebuild the Clojure source). Transaction retries happen in src/jvm/clojure/lang/LockingTransaction.java in the run() method. There's a big for loop there that goes until done or RETRY_LIMIT. The value of i when the loop exits should be the retry count.