phunt commented on a change in pull request #787: ZOOKEEPER-3253: client should
not send requests with cxid=-4, -2, or -1
URL: https://github.com/apache/zookeeper/pull/787#discussion_r259901448
##########
File path: zookeeper-server/src/main/java/org/apache/zookeeper/ClientCnxn.java
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@@ -1510,6 +1511,11 @@ public void close() throws IOException {
* the server. Thus, getXid() must be public.
*/
synchronized public int getXid() {
+ // xid values of -4, -2, and -1 are special, see
SendThread.readResponse
+ // Skip from -5 to 1.
Review comment:
why are we allowing negative numbers at all? shouldn't we check for "about
to rollover" prior to the increment and then reset to 1? It seems to me that
that would be a whole lot easier to grok.
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