[
https://issues.apache.org/jira/browse/ZOOKEEPER-2684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857452#comment-15857452
]
Ryan Zhang commented on ZOOKEEPER-2684:
---------------------------------------
Alex, yes, I think the solution is pretty much along this line after we know
what leads to this crash.
Kfir, I am sorry that I can't really make out exactly what those "this" links
point to, can you put a line number somewhere?
In any case, I have a fix along the line of knowing the first CXid of the
session this server sees and only does the comparison to queue head when it's
larger than that. I am testing it internally and also trying to figure out how
to do that github and "pull request" thing if I am happy with the result. I am
still working on a test case that can repro this reliably and being
unsuccessful so far.
> 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
>
> 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)
