athanatos edited a comment 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-467962868 @phunt I was unable to find anything server side that actually compares cxids other than to check equality. I believe this patch to be safe so long as two requests with the same cxid on the same session are not live at the same time -- which a 31 bit cxid is probably sufficient to ensure. Note, the current implementation already permits wrapping from MAX to MIN. This behavior occurs regularly in our environment and the only misbehavior it seems to cause is that the requests submitted with a cxid value of -4, -2, or -1 hang or cause a reconnect. The patch also includes a test to exercise the behavior specifically.
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