Repro for bug in concurrent schema changes for many tables and indexing involved. Do alter tables by doing in parallel new table creation, alter a table (_alter), and index other tables (_index). Original repro had sets of 20 of those and slept for 20 seconds to settle. This repro does it for Scylla with just 1 set and 1 second. This issue goes away once Raft is enabled. https://github.com/scylladb/scylla/issues/1207 Originally at https://issues.apache.org/jira/browse/CASSANDRA-10250 Signed-off-by: Alejo Sanchez <alejo.sanchez@scylladb.com>