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From "Sotirios Delimanolis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11429) DROP TABLE IF EXISTS fails against table with similar name
Date Thu, 24 Mar 2016 21:07:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15210950#comment-15210950
] 

Sotirios Delimanolis commented on CASSANDRA-11429:
--------------------------------------------------

It's not. The deployment process starts and blocks on a single host in the cluster. So all
those CREATE IF NOT EXISTS/DROP/ALTER are only run on one node, sequentially. I haven't seen
anything that suggests that this process isn't working as intended.

Why is Cassandra associating the old table with the found new table {{cf_id}}, {{c712a590-f194-11e5-891d-2d7ca98597ba}}?
Please clarify "Cassandra isn't confusing the two.".

Only restarting the nodes didn't help. I had to actually clear those cache files.

> DROP TABLE IF EXISTS fails against table with similar name
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-11429
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11429
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Sotirios Delimanolis
>
> We had a table named {{our_keyspace.native_address_book_uploads_cache}} (note the uploads*)
which we dropped. We then created a new table named {{our_keyspace.native_address_book_upload_cache}}
(note the upload*).
> We have a patching component that applies commands to prepare the schema using the C#
driver. When we deploy, it tries to execute
> {noformat}
> DROP TABLE IF NOT EXISTS our_keyspace.native_address_book_uploads_cache;
> {noformat}
> This fails with
> {noformat}
> Caught an exception Cassandra.ServerErrorException: java.lang.RuntimeException: java.util.concurrent.ExecutionException:
java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column
family ID mismatch (found c712a590-f194-11e5-891d-2d7ca98597ba; expected b8b40ed0-f194-11e5-b481-d944f7ad0ce3)
> {noformat}
> showing the Cassandra Java exception through the C# driver. Note the {{found}} cf_id
of {{c712a590-f194-11e5-891d-2d7ca98597ba}}.
> I can reproduce this with {{cqlsh}}.
> {noformat}
> selimanolis$ cqlsh
> Connected to Default Cluster at hostname:9042.
> [cqlsh 5.0.1 | Cassandra 2.1.13-SNAPSHOT | CQL spec 3.2.1 | Native protocol v3]
> Use HELP for help.
> cqlsh> SELECT cf_id from system.schema_columnfamilies  where keyspace_name = 'our_keyspace'
and columnfamily_name ='native_address_book_uploads_cache';
>  keyspace_name | columnfamily_name | bloom_filter_fp_chance | caching | cf_id | column_aliases
| comment | compaction_strategy_class | compaction_strategy_options | comparator | compression_parameters
| default_time_to_live | default_validator | dropped_columns | gc_grace_seconds | index_interval
| is_dense | key_aliases | key_validator | local_read_repair_chance | max_compaction_threshold
| max_index_interval | memtable_flush_period_in_ms | min_compaction_threshold | min_index_interval
| read_repair_chance | speculative_retry | subcomparator | type | value_alias
> ---------------+-------------------+------------------------+---------+-------+----------------+---------+---------------------------+-----------------------------+------------+------------------------+----------------------+-------------------+-----------------+------------------+----------------+----------+-------------+---------------+--------------------------+--------------------------+--------------------+-----------------------------+--------------------------+--------------------+--------------------+-------------------+---------------+------+-------------
> (0 rows)
> cqlsh> SELECT cf_id from system.schema_columnfamilies  where keyspace_name = 'our_keyspace'
and columnfamily_name ='native_address_book_upload_cache';
>  cf_id
> --------------------------------------
>  c712a590-f194-11e5-891d-2d7ca98597ba
> (1 rows)
> cqlsh> drop TABLE IF EXISTS our_keyspace.native_address_book_uploads_cache;
> InvalidRequest: code=2200 [Invalid query] message="No keyspace has been specified. USE
a keyspace, or explicitly specify keyspace.tablename"
> cqlsh> drop TABLE IF EXISTS our_keyspace.native_address_book_uploads_cache;
> ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.RuntimeException:
java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException:
Column family ID mismatch (found c712a590-f194-11e5-891d-2d7ca98597ba; expected b8b40ed0-f194-11e5-b481-d944f7ad0ce3)">
> cqlsh> 
> {noformat}
> The table doesn't exist. A table that has a similar name does. You'll notice that the
new table has same {{cf_id}} found in the error message above. Why does Cassandra confuse
the two?
> Our expectation is for the {{DROP TABLE IF EXISTS}} to silently succeed.
> Similarly, we expect a {{DROP TABLE}} to fail because the table doesn't exist. That's
not what happens if you see below
> {noformat}
> cqlsh> DROP TABLE our_keyspace.native_address_book_uploads_cache;
> ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.RuntimeException:
java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException:
Column family ID mismatch (found c712a590-f194-11e5-891d-2d7ca98597ba; expected b8b40ed0-f194-11e5-b481-d944f7ad0ce3)">
> cqlsh> DROP TABLE our_keyspace.native_address_book_uploads_cacheadsfasdf;
> InvalidRequest: code=2200 [Invalid query] message="unconfigured columnfamily native_address_book_uploads_cacheadsfasdf"
> {noformat}
> ----
> I cannot reproduce the problem with entirely new tables.



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