ifesdjeen opened a new pull request, #4058:
URL: https://github.com/apache/cassandra/pull/4058
* Improve Journal threading model (switch to a single maintenance executer
in place of multiple executors)
* Improve signalling during segment allocation; avoid using wait queues
for both segment allocation and flushes
* Get rid of callback queues and record pointers, and instead use
Allocation for signalling flush completion
* Fix an issue with segment availability for read during switching
* Wire up failure callbacks for journal
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