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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-6309) Pig CqlStorage generates ERROR 1108: Duplicate schema alias
Date Thu, 07 Nov 2013 16:51:17 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Liu reassigned CASSANDRA-6309:
-----------------------------------

    Assignee: Alex Liu

> Pig CqlStorage generates  ERROR 1108: Duplicate schema alias
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-6309
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6309
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>            Reporter: Thunder Stumpges
>            Assignee: Alex Liu
>
> In Pig after loading a simple CQL3 table from Cassandra 2.0.1, and dumping contents,
I receive:
> Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 1108: Duplicate schema
alias: author in "cm"
>  cm = load 'cql://thunder_test/cassandra_messages' USING CqlStorage;
>  dump cm
> ERROR org.apache.pig.tools.grunt.Grunt - org.apache.pig.impl.logicalLayer.FrontendException:
ERROR 1066: Unable to open iterator for alias cm
> ...
> Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 1108: Duplicate schema
alias: author in "cm"
>         at org.apache.pig.newplan.logical.visitor.SchemaAliasVisitor.validate(SchemaAliasVisitor.java:75)
> running 'describe cm' gives:
> cm: {message_id: chararray,author: chararray,author: chararray,body: chararray,message_id:
chararray}
> The original table schema in Cassandra is:
> CREATE TABLE cassandra_messages (
>   message_id text,
>   author text,
>   body text,
>   PRIMARY KEY (message_id, author)
> ) WITH
>   bloom_filter_fp_chance=0.010000 AND
>   caching='KEYS_ONLY' AND
>   comment='null' AND
>   dclocal_read_repair_chance=0.000000 AND
>   gc_grace_seconds=864000 AND
>   index_interval=128 AND
>   read_repair_chance=0.100000 AND
>   replicate_on_write='true' AND
>   populate_io_cache_on_flush='false' AND
>   default_time_to_live=0 AND
>   speculative_retry='NONE' AND
>   memtable_flush_period_in_ms=0 AND
>   compaction={'class': 'SizeTieredCompactionStrategy'} AND
>   compression={'sstable_compression': 'LZ4Compressor'};
> it appears that the code in CqlStorage.getColumnMetadata at ~line 478 takes the "keys"
columns (in my case, message_id and author) and appends the columns from getColumnMeta (which
has all three columns). Thus the keys columns are duplicated.



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