Hadoop QA commented on ZOOKEEPER-417:
-1 overall. Here are the results of testing the latest attachment
against trunk revision 788539.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 12 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
+1 findbugs. The patch does not introduce any new Findbugs warnings.
-1 release audit. The applied patch generated 182 release audit warnings
(more than the trunk's current 181 warnings).
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Release audit warnings:
This message is automatically generated.
> stray message problem when changing servers
> Key: ZOOKEEPER-417
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-417
> Project: Zookeeper
> Issue Type: Bug
> Reporter: Benjamin Reed
> Assignee: Benjamin Reed
> Priority: Blocker
> Fix For: 3.2.0
> Attachments: ZOOKEEPER-417.patch, ZOOKEEPER-417.patch,
> ZOOKEEPER-417.patch, ZOOKEEPER-417.patch
> There is a possibility for stray messages from a previous connection to
> violate ordering and generally cause problems. Here is a scenario: we have a
> client, C, two followers, F1 and F2, and a leader, L. The client is connected
> to F1, which is a slow follower. C sends setData("/a", "1") to F1 and then
> loses the connection, so C reconnects to F2 and sends setData("/a", "2"). it
> is possible, if F1 is slow enough and the setData("/a", "1") got onto the
> network before the connection break, for F1 to forward the setData("/a", "1")
> to L after F2 forwards setData("/a", "2").
> to fix this, the leader should keep track of which follower last registered a
> session for a client and drop any requests from followers for clients for
> whom they do not have a registration.
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