Thomas Steinmaurer created CASSANDRA-16442: ----------------------------------------------
Summary: Improve handling of failed prepared statement loading Key: CASSANDRA-16442 URL: https://issues.apache.org/jira/browse/CASSANDRA-16442 Project: Cassandra Issue Type: Improvement Reporter: Thomas Steinmaurer In an internal DEV cluster, when going from 3.0 to 3.11 we have seen the following WARN logs constantly upon Cassandra startup. {noformat} ... WARN [main] 2021-02-05 09:25:06,892 QueryProcessor.java:160 - prepared statement recreation error: SELECT n,v FROM "Ts2Volatile60Min" WHERE k=? LIMIT ?; WARN [main] 2021-02-05 09:25:06,895 QueryProcessor.java:160 - prepared statement recreation error: INSERT INTO "Ts2Final01Min" (k,n,v) VALUES (?,?,?) USING TIMESTAMP ?; ... {noformat} I guess 3.11 tries to pre-load prepared statements for tables which don't exist anymore. On how we got into this situation was our fault I think (Cas 3.0 => Upgrade 3.11 => Downgrade 3.0 => with 3.0 some tables got dropped => Upgrade 3.11.10). Still, perhaps there is room for improvement when it comes to loading persisted prepared statements, which might fail. I thought about: * An additional {{nodetool}} option to wipe the persisted prepared statement cache * Perhaps even make the startup code smarter in a way, when loading of a prepared statement fails, due to a table not being available anymore, then auto-wipe such entries from the {{prepared_statements}} system table To get rid of the WARN log, I currently need to work directly on the "prepared_statements" system table, but I don't know if it is safe to run e.g. a TRUNCATE statement, thus currently, it seems we need to take each node offline, execute a Linux {{rm}} command on SSTables for the system table. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org