Adam Holmberg created CASSANDRA-10328:
-----------------------------------------
Summary: Inconsistent Schema Change Events Between Table and View
Key: CASSANDRA-10328
URL: https://issues.apache.org/jira/browse/CASSANDRA-10328
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Adam Holmberg
I'm seeing inconsistent event delivery when it comes to dropping materialized
views (when compared to tables or indexes).
For example, create/drop/alter for a table:
{code}
cassandra@cqlsh:test> create TABLE t (k int PRIMARY KEY , v int);
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'CREATED', 'target_type':
u'TABLE', u'table': u't'}, stream_id=-1)>
cassandra@cqlsh:test> alter TABLE t add v1 int;
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'TABLE', u'table': u't'}, stream_id=-1)>
cassandra@cqlsh:test> drop TABLE t;
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'DROPPED', 'target_type':
u'TABLE', u'table': u't'}, stream_id=-1)>
{code}
And for a view:
{code}
cassandra@cqlsh:test> create MATERIALIZED VIEW mv as select * from scores WHERE
game IS NOT NULL AND score IS NOT NULL AND user IS NOT NULL AND year IS NOT
NULL AND month IS NOT NULL AND day IS NOT NULL PRIMARY KEY (game, user,
year, month, day, score) WITH CLUSTERING ORDER BY (score desc);
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'CREATED', 'target_type':
u'TABLE', u'table': u'mv'}, stream_id=-1)>
cassandra@cqlsh:test> alter materialized view all with min_index_interval = 100;
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'TABLE', u'table': u'all'}, stream_id=-1)>
cassandra@cqlsh:test> drop MATERIALIZED VIEW mv;
<EventMessage(event_type=u'SCHEMA_CHANGE', trace_id=None,
event_args={'keyspace': u'test', 'change_type': u'UPDATED', 'target_type':
u'KEYSPACE'}, stream_id=-1)>
{code}
The latter sequence is missing a table update event, meaning clients cannot
tell that a view was dropped.
This is on a [branch
in-progress|https://github.com/iamaleksey/cassandra/commits/9921-3.0] for
CASSANDRA-9921
As a side note, I also believe they keyspace update events are unnecessary in
both scenarios. To my knowledge, drivers only use these events to refresh meta
on the keyspace definition itself, not the entities it contains. Please let me
know if this is worthy of discussion or a distinct ticket.
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