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Date: Mon, 2 Feb 2015 17:35:34 +0000 (UTC)
From: "Brandon Williams (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-8715) Possible Deadlock in Cqlsh in a
 Kerberos-enabled environment when using "COPY ... FROM ..."
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     [ https://issues.apache.org/jira/browse/CASSANDRA-8715?page=3Dcom.atla=
ssian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams updated CASSANDRA-8715:
----------------------------------------
    Priority: Minor  (was: Critical)

> Possible Deadlock in Cqlsh in a Kerberos-enabled environment when using "=
COPY ... FROM ..."
> -------------------------------------------------------------------------=
------------------
>
>                 Key: CASSANDRA-8715
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8715
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 2.1.2.160, cqlsh 5.0.1, Native protocol v3
>            Reporter: Eduard Tudenhoefner
>            Assignee: Tyler Hobbs
>            Priority: Minor
>              Labels: cqlsh
>             Fix For: 2.1.3
>
>
> When running a COPY ... FROM ... command in a Kerberos environment, I see=
 the number of rows processed, but eventually, Cqlsh never returns. I can v=
erify, that all the data was copied, but the progress bar shows me the last=
 shown info and cqlsh hangs there and never returns.
> Please note that this issue did *not* occur in the exact same environment=
 with *Cassandra 2.0.12.156*.
> With the help of Tyler Hobbs, I investigated the problem a little bit fur=
ther and added some debug statements at specific points. For example, in th=
e CountdownLatch class at https://github.com/apache/cassandra/blob/a323a1a6=
d5f28ced1a51ba559055283f3eb356ff/pylib/cqlshlib/async_insert.py#L35-L36 I c=
an see that the counter always stays above zero and therefore never returns=
 (even when the data to be copied is already copied).
> I've also seen that somehow when I type in one cqlsh command, there will =
be actually two commands. Let me give you an example:
> I added a debug statement just before https://github.com/apache/cassandra=
/blob/d76450c7986202141f3a917b3623a4c3138c1094/bin/cqlsh#L920
> {code}
> cqlsh> use libdata ;=E2=80=A8
> 2015-01-30 18:54:56,113 [DEBUG] root: STATEMENT: [('K_USE', 'use', (0, 3)=
), ('identifier', 'libdata', (4, 11)), ('endtoken', ';', (12, 13))]=E2=80=
=A8
> 2015-01-30 18:54:56,113 [DEBUG] root: STATEMENT: [('K_USE', 'use', (0, 3)=
), ('identifier', 'libdata', (4, 11)), ('endtoken', ';', (12, 13))]
> {code}
> and saw that all commands I enter, they end up being executed twice (same=
 goes for the COPY command).
> If I can provide any other input for debugging purposes, please let me kn=
ow.


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