hanm commented on a change in pull request #1172: ZOOKEEPER-3594: Ability to
skip proposing requests with error transactions
URL: https://github.com/apache/zookeeper/pull/1172#discussion_r360623718
##########
File path:
zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/LearnerHandler.java
##########
@@ -1159,4 +1178,43 @@ public void setFirstPacket(boolean value) {
needOpPacket = value;
}
+ private final SkippedRequestQueue skippedRequestQueue = new
SkippedRequestQueue();
+
+ /**
+ * This method must be called from the RP chain thread
+ * right after PrepRequestProcessor. Once it's known that
+ * the request is invalid we can skip sending PROPOSE and go directly to
+ * COMMIT but we need to wait to do that in order with the other requests.
+ *
+ * The request will be immediately sent back to the learner if there is no
pending commits
+ * otherwise the request will be put inside the handler's queue to wait
for pending commit
+ * to complete before is sent so we make sure we send all requests in
order.
+ */
Review comment:
we can remove these comments, they are duplicate of the same comments on the
`SkipRequestHandler` interface.
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