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Posted to commits@cassandra.apache.org by "Tyler Hobbs (JIRA)" <ji...@apache.org> on 2015/02/24 01:34:12 UTC
[jira] [Resolved] (CASSANDRA-8715) Possible Deadlock in Cqlsh in a
Kerberos-enabled environment when using "COPY ... FROM ..."
[ https://issues.apache.org/jira/browse/CASSANDRA-8715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tyler Hobbs resolved CASSANDRA-8715.
------------------------------------
Resolution: Cannot Reproduce
I'm going to mark this as Cannot Reproduce for now. If you're able to narrow it down to a problem in cqlsh itself, feel free to re-open the ticket.
> 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: 2.1.4
>
>
> When running a COPY ... FROM ... command in a Kerberos environment, I see the number of rows processed, but eventually, Cqlsh never returns. I can verify, 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 further and added some debug statements at specific points. For example, in the CountdownLatch class at https://github.com/apache/cassandra/blob/a323a1a6d5f28ced1a51ba559055283f3eb356ff/pylib/cqlshlib/async_insert.py#L35-L36 I can 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 ;
> 2015-01-30 18:54:56,113 [DEBUG] root: STATEMENT: [('K_USE', 'use', (0, 3)), ('identifier', 'libdata', (4, 11)), ('endtoken', ';', (12, 13))]
> 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 know.
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