[jira] [Created] (CASSANDRA-8715) Possible Deadlock in Cqlsh in a Kerberos-enabled environment when using "COPY ... FROM ..."

["Eduard Tudenhoefner (JIRA)" <ji...@apache.org>]

Eduard Tudenhoefner created CASSANDRA-8715:
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             Summary: 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
            Priority: Critical


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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