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https://issues.apache.org/jira/browse/CASSANDRA-17047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719855#comment-17719855
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Benjamin Lerer commented on CASSANDRA-17047:
--------------------------------------------
I will.
> Dropping a column can break queries until the schema is fully propagated
> (TAKE 2)
> ---------------------------------------------------------------------------------
>
> Key: CASSANDRA-17047
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17047
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Schema
> Reporter: Benjamin Lerer
> Assignee: Benjamin Lerer
> Priority: Normal
> Fix For: 3.0.x, 3.11.x, 4.0.x
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> With a table like:
> {code}
> CREATE TABLE ks.tbl (id int primary key, v1 int, v2 int, v3 int)
> {code}
> and we drop {{v2}}, we get this exception on the replicas which haven't seen
> the schema change:
> {code}
> ERROR [SharedPool-Worker-1] node2 2020-06-24 09:49:08,107
> AbstractLocalAwareExecutorService.java:169 - Uncaught exception on thread
> Thread[SharedPool-Worker-1,5,node2]
> java.lang.IllegalStateException: [ColumnDefinition{name=v1,
> type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, position=-1},
> ColumnDefinition{name=v2, type=org.apache.cassandra.db.marshal.Int32Type,
> kind=REGULAR, position=-1}, ColumnDefinition{name=v3,
> type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, position=-1}]
> is not a subset of [v1 v3]
> at
> org.apache.cassandra.db.Columns$Serializer.encodeBitmap(Columns.java:546)
> ~[main/:na]
> at
> org.apache.cassandra.db.Columns$Serializer.serializeSubset(Columns.java:478)
> ~[main/:na]
> at
> org.apache.cassandra.db.rows.UnfilteredSerializer.serialize(UnfilteredSerializer.java:184)
> ~[main/:na]
> at
> org.apache.cassandra.db.rows.UnfilteredSerializer.serialize(UnfilteredSerializer.java:114)
> ~[main/:na]
> at
> org.apache.cassandra.db.rows.UnfilteredSerializer.serialize(UnfilteredSerializer.java:102)
> ~[main/:na]
> at
> org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.serialize(UnfilteredRowIteratorSerializer.java:132)
> ~[main/:na]
> at
> org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.serialize(UnfilteredRowIteratorSerializer.java:87)
> ~[main/:na]
> ...
> {code}
> Note that it doesn't matter if we {{SELECT *}} or {{SELECT id, v1}}
> CASSANDRA-15899 tried to fix the problem when columns are dropped as well as
> when columns are added. Unfortunately the fix introduced an issue and had to
> be reverted in CASSANDRA-16735.
> If the scenario for ADDED columns is tricky, the original scenario for
> DROPPED columns can be solved in a safe way at the {{ColumnFilter}} level.
> By consequence, I think that we should at least solve that scenario.
> [~bdeggleston], [~samt], [~ifesdjeen] does my proposal makes sense to you?
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