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From Charles Lamanna <char...@metricshub.com>
Subject Fixing the schema for a Column Family
Date Sat, 29 Dec 2012 01:22:15 GMT
Hello folks --

I just ran into this nasty Cassandra issue:
https://issues.apache.org/jira/browse/CASSANDRA-4805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel

As a result, one of my column families had its schema reset. For example,
when I created the column family, this was its schema:

CREATE TABLE values (   rk text,   ck text,   cnt counter,   sum counter,
PRIMARY KEY (rk, ck) );

And now, it's schema has become:

cqlsh:metrics> describe COLUMNFAMILy values;
CREATE TABLE fifteenminutes (  rk text PRIMARY KEY )


*Is there a way to restore the schema? (all my client code expects the
original schema?)*

I can add back the cnt / sum columns by updating the column_metadata in the
Cassandra-Cli -- however, I cannot find a way to fix the compound primary
key. This is the command that restored everything but the compound primary
key:

alter column family values
  with column_type = 'Standard'
  and comparator =
'CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type)'
  and default_validation_class = 'CounterColumnType'
  and key_validation_class = 'UTF8Type'
  and read_repair_chance = 0.0
  and dclocal_read_repair_chance = 0.0
  and gc_grace = 864000
  and min_compaction_threshold = 4
  and max_compaction_threshold = 32
  and replicate_on_write = true
  and compaction_strategy =
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'
  and caching = 'KEYS_ONLY'
  and compression_options = {'sstable_compression' :
'org.apache.cassandra.io.compress.SnappyCompressor'}
  and column_metadata=[
        { column_name:'cnt', validation_class:CounterColumnType },
        { column_name:'sum', validation_class:CounterColumnType }
    ];


Also, FWIW, if I describe the schema of my busted CF, I see the following
errors:

Unexpected table structure; may not translate correctly to CQL. expected
composite key CF to have column aliases, but found none
Unexpected table structure; may not translate correctly to CQL. expected
[u'rk'] length to be 2, but it's 1.


Thanks!
Charles

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