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https://issues.apache.org/jira/browse/ZOOKEEPER-2684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856615#comment-15856615
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Kfir Lev-Ari commented on ZOOKEEPER-2684:
-----------------------------------------
Hi Ryan, is it possible that the reason you see this type of bad behavior is
because it wasn't examined before in the commit processor? i.e., it's a new
error message that we added in order to notify that commit messages don't
follow their client order.
I wonder, can you to add to an un-patched version the same error message? (and
see if you get that error)
e.g., before
[this|https://github.com/apache/zookeeper/commit/9fc632c4f0a340b0a00ec6dff39c7b454c802822?diff=split#diff-5cc688a027068714af01b0ad4d292fe5L223]
point, add something like
if (pending != null && pending.sessionId == request.sessionId && pending.cxid >
request.cxid)
LOG.error("Got cxid 0x " + Long.toHexString(request.cxid) + " expected 0x" +
Long.toHexString(pending.cxid) + " for client session id " +
Long.toHexString(request.sessionId));
throw new IOException("Error: unexpected cxid for" + "client session");
> 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.
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