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https://issues.apache.org/jira/browse/CASSANDRA-14822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792912#comment-16792912
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Jordan West commented on CASSANDRA-14822:
-----------------------------------------
[~jolynch] reading CASSANDRA-13910 it looks like the decision to throw an
exception in this case was explicit – to inform the user the feature was
removed vs. silently accepting it but doing nothing. Perhaps the exception
could be better instead?
Separately, it seems like the Python driver needs to be updated as you mention
and upgrading to a newer version is likely a pre-requisite for migrating to
4.0.
> Cassandra 4.0 doesn't output DESCRIBE TABLE representations that are valid
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-14822
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14822
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Tools
> Reporter: Joseph Lynch
> Assignee: Joseph Lynch
> Priority: Low
> Labels: cqlsh
>
> Looks like right now on 4.0 the {{DESCRIBE}} output of a table is no longer
> valid since {{dclocal_read_repair_chance}} was removed:
> {noformat}
> cqlsh> CREATE KEYSPACE test WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 1};
> cqlsh> CREATE TABLE test.test (key text, value text, PRIMARY KEY(key));
> cqlsh> DESCRIBE TABLE test.test
> CREATE TABLE test.test (
> key text PRIMARY KEY,
> value text
> ) WITH bloom_filter_fp_chance = 0.01
> AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
> AND comment = ''
> AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
> AND compression = {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND crc_check_chance = 1.0
> AND dclocal_read_repair_chance = 0.0
> AND default_time_to_live = 0
> AND gc_grace_seconds = 864000
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.0
> AND speculative_retry = '99p';
> {noformat}
> If you then try to copy and past that output it fails:
> {noformat}
> cqlsh> CREATE TABLE test.test2 (
> ... key text PRIMARY KEY,
> ... value text
> ... ) WITH bloom_filter_fp_chance = 0.01
> ... AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
> ... AND comment = ''
> ... AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
> ... AND compression = {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> ... AND crc_check_chance = 1.0
> ... AND dclocal_read_repair_chance = 0.0
> ... AND default_time_to_live = 0
> ... AND gc_grace_seconds = 864000
> ... AND max_index_interval = 2048
> ... AND memtable_flush_period_in_ms = 0
> ... AND min_index_interval = 128
> ... AND read_repair_chance = 0.0
> ... AND speculative_retry = '99p';
> SyntaxException: Unknown property 'dclocal_read_repair_chance'
> {noformat}
> Currently we leave in {{dclocal_read_repair_chance}} and
> {{read_repair_chance}} for the drivers per the comments left during
> CASSANDRA-13910.
> I think we can just ignore those parameters in the validation/creation.
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