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https://issues.apache.org/jira/browse/CASSANDRA-14822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795215#comment-16795215
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Jordan West commented on CASSANDRA-14822:
-----------------------------------------
{quote}At the very minimum we need to make it so that 4.0 can understand
schemas that were outputted by 4.0 itself. So I'll get that done regardless I
guess.
{quote}
Agreed.
{quote}To achieve the goal of having the current Cassandra release be backwards
compatible with the previous version (server and client) we'd have to cut
releases of the pre 4.0 drivers as well.
{quote}
There is certainly a goal of having the server be backwards compatible but do
we expect old client's to be compatible with a new server? Thats a reasonable
ask but I'm not sure its currently the case – my understanding is that we
require the client to be upgraded first and the client must be backwards
compatible with older server versions. Maybe something to bring up on the
mailing list?
{quote}I think we should just WARN in 4.0 as suggested
{quote}
That's reasonable but it seems like this was already debated and decided in
CASSANDRA-13910. Maybe its worth revisiting after discussing the above?
> 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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