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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