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From "Nick Bailey (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6373) describe_ring hangs with hsha thrift server
Date Fri, 13 Dec 2013 16:54:10 GMT


Nick Bailey commented on CASSANDRA-6373:

[~xedin] I've verified its *only* the describe_ring call. Other calls seem to work fine. Let
me know if you want access to the machine I used to reproduce.

> describe_ring hangs with hsha thrift server
> -------------------------------------------
>                 Key: CASSANDRA-6373
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Nick Bailey
>            Assignee: Pavel Yaskevich
>             Fix For: 2.0.4
>         Attachments: describe_ring_failure.patch
> There is a strange bug with the thrift hsha server in 2.0 (we switched to lmax disruptor
> The bug is that the first call to describe_ring from one connection will hang indefinitely
when the client is not connecting from localhost (or it at least looks like the client is
not on the same host). Additionally the cluster must be using vnodes. When connecting from
localhost the first call will work as expected. And in either case subsequent calls from the
same connection will work as expected. According to git bisect the bad commit is the switch
to the lmax disruptor server:
> I've attached the patch I used to reproduce the error in the unit tests. The command
to reproduce is: 
> {noformat}
> PYTHONPATH=test nosetests --tests=system.test_thrift_server:TestMutations.test_describe_ring
> {noformat}
> I reproduced on ec2 and a single machine by having the server bind to the private ip
on ec2 and the client connect to the public ip (so it appears as if the client is non local).
I've also reproduced with two different vms though.

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