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Posted to commits@cassandra.apache.org by "Alex Petrov (Jira)" <ji...@apache.org> on 2020/08/24 10:17:00 UTC
[jira] [Commented] (CASSANDRA-15899) Dropping a column can break
queries until the schema is fully propagated
[ https://issues.apache.org/jira/browse/CASSANDRA-15899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183133#comment-17183133 ]
Alex Petrov commented on CASSANDRA-15899:
-----------------------------------------
A minor comment: shouold we consider implementing {{isPlaceholder}} on {{Placeholder}} class to avoid instanceOf checks? Also, it might be useful to add tests for {{*}} not only {{id, v1}} in {{SchemaTest.java}}.
> Dropping a column can break queries until the schema is fully propagated
> ------------------------------------------------------------------------
>
> Key: CASSANDRA-15899
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15899
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Schema
> Reporter: Marcus Eriksson
> Assignee: Blake Eggleston
> Priority: Normal
> Fix For: 3.0.x
>
>
> 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}}
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