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Ryan Zhang commented on ZOOKEEPER-2684: --------------------------------------- Kfir Lev-Ari, no, you are not missing anything. I just wondered how does ZK guarantee that the same request won't be send to the commit processor twice as a lot of strange things can happen in a distributed system. I would like to add a check in the commit processor but it was a bit messy, otherwise it won't hurt even if this never happens. > Fix a crashing bug in the mixed workloads commit processor > ---------------------------------------------------------- > > Key: ZOOKEEPER-2684 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2684 > Project: ZooKeeper > Issue Type: Bug > Components: server > Affects Versions: 3.6.0 > Environment: with pretty heavy load on a real cluster > Reporter: Ryan Zhang > Assignee: Ryan Zhang > Priority: Blocker > Attachments: ZOOKEEPER-2684.patch > > > We deployed our build with ZOOKEEPER-2024 and it quickly started to crash > with the following error > atla-buh-05-sr1.prod.twttr.net: 2017-01-18 22:24:42,305 - ERROR > [CommitProcessor:2] > -org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:268) > – Got cxid 0x119fa expected 0x11fc5 for client session id 1009079ba470055 > atla-buh-05-sr1.prod.twttr.net: 2017-01-18 22:32:04,746 - ERROR > [CommitProcessor:2] > -org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:268) > – Got cxid 0x698 expected 0x928 for client session id 4002eeb3fd0009d > atla-buh-05-sr1.prod.twttr.net: 2017-01-18 22:34:46,648 - ERROR > [CommitProcessor:2] > -org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:268) > – Got cxid 0x8904 expected 0x8f34 for client session id 51b8905c90251 > atla-buh-05-sr1.prod.twttr.net: 2017-01-18 22:43:46,834 - ERROR > [CommitProcessor:2] > -org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:268) > – Got cxid 0x3a8d expected 0x3ebc for client session id 2051af11af900cc > clearly something is not right in the new commit processor per session queue > implementation. -- This message was sent by Atlassian JIRA (v6.3.15#6346)