phunt commented on issue #787: ZOOKEEPER-3253: client should not send requests with cxid=-4, -2, or -1 URL: https://github.com/apache/zookeeper/pull/787#issuecomment-469939867 +1, lgtm. thanks @athanatos I also reviewed the server side code and it looks like client xid "going back in time" (my earlier concern) is fine. I did notice this however - notice negative client xids circumvent throttling! So we're fixing this bug as well by resetting the xid before it rolls over. ``` public void incrOutstandingAndCheckThrottle(RequestHeader h) { if (h.getXid() <= 0) { return; } if (zkServer.shouldThrottle(outstandingCount.incrementAndGet())) { disableRecv(false); } } ```
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