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https://issues.apache.org/jira/browse/CASSANDRA-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983364#action_12983364
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Gary Dusbabek commented on CASSANDRA-2001:
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If you bypass the ClassCastException that 926 introduced, you end up with an
avro error:
org.apache.avro.AvroTypeException: Found
{"type":"record","name":"CfDef","namespace":"org.apache.cassandra.avro","fields":[{"name":"keyspace","type":"string"},{"name":"name","type":"string"},{"name":"column_type","type":["string","null"]},{"name":"comparator_type","type":["string","null"]},{"name":"subcomparator_type","type":["string","null"]},{"name":"comment","type":["string","null"]},{"name":"row_cache_size","type":["double","null"]},{"name":"key_cache_size","type":["double","null"]},{"name":"read_repair_chance","type":["double","null"]},{"name":"gc_grace_seconds","type":["int","null"]},{"name":"default_validation_class","type":["null","string"],"default":null},{"name":"min_compaction_threshold","type":["null","int"],"default":null},{"name":"max_compaction_threshold","type":["null","int"],"default":null},{"name":"row_cache_save_period_in_seconds","type":["int","null"],"default":0},{"name":"key_cache_save_period_in_seconds","type":["int","null"],"default":3600},{"name":"memtable_flush_after_mins","type":["int","null"],"default":60},{"name":"memtable_throughput_in_mb","type":["null","int"],"default":null},{"name":"memtable_operations_in_millions","type":["null","double"],"default":null},{"name":"id","type":["int","null"]},{"name":"column_metadata","type":[{"type":"array","items":{"type":"record","name":"ColumnDef","fields":[{"name":"name","type":"bytes"},{"name":"validation_class","type":"string"},{"name":"index_type","type":[{"type":"enum","name":"IndexType","symbols":["KEYS"],"aliases":["org.apache.cassandra.config.avro.IndexType"]},"null"]},{"name":"index_name","type":["string","null"]}]}},"null"]}]},
expecting
{"type":"record","name":"CfDef","namespace":"org.apache.cassandra.avro","fields":[{"name":"keyspace","type":"string"},{"name":"name","type":"string"},{"name":"column_type","type":["string","null"]},{"name":"comparator_type","type":["string","null"]},{"name":"subcomparator_type","type":["string","null"]},{"name":"comment","type":["string","null"]},{"name":"row_cache_size","type":["double","null"]},{"name":"key_cache_size","type":["double","null"]},{"name":"read_repair_chance","type":["double","null"]},{"name":"gc_grace_seconds","type":["int","null"]},{"name":"default_validation_class","type":["null","string"],"default":null},{"name":"min_compaction_threshold","type":["null","int"],"default":null},{"name":"max_compaction_threshold","type":["null","int"],"default":null},{"name":"row_cache_save_period_in_seconds","type":["int","null"],"default":0},{"name":"key_cache_save_period_in_seconds","type":["int","null"],"default":3600},{"name":"memtable_flush_after_mins","type":["int","null"],"default":60},{"name":"memtable_throughput_in_mb","type":["null","int"],"default":null},{"name":"memtable_operations_in_millions","type":["null","double"],"default":null},{"name":"id","type":["int","null"]},{"name":"column_metadata","type":[{"type":"array","items":{"type":"record","name":"ColumnDef","fields":[{"name":"name","type":"bytes"},{"name":"validation_class","type":"string"},{"name":"index_type","type":[{"type":"enum","name":"IndexType","symbols":["KEYS"],"aliases":["org.apache.cassandra.config.avro.IndexType"]},"null"]},{"name":"index_name","type":["string","null"]}],"aliases":["org.apache.cassandra.config.avro.ColumnDef"]}},"null"]},{"name":"replicate_on_write","type":["boolean","null"]}],"aliases":["org.apache.cassandra.config.avro.CfDef"]}
basically, avro was expecting to see replicate_on_write.
> 0.7 migrations/schema serializations are incompatible with trunk
> ----------------------------------------------------------------
>
> Key: CASSANDRA-2001
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2001
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Gary Dusbabek
> Assignee: Gary Dusbabek
> Priority: Minor
> Fix For: 0.8
>
> Attachments: data.zip,
> v1-0001-use-the-writer-schema-and-not-the-current-schema-when-.txt,
> v1-0002-get-rid-of-the-avro-db.migrations-classes-that-were-du.txt,
> v1-0003-fix-order-of-replicate_on_write-and-make-sure-it-s-not.txt
>
>
> Two problems:
> 1. inserting replicate_on_write into the middle of the CfDef members created
> a problem with serialization.
> 2. merging the genavro files created a strange namespacing problem.
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