Very long delay on "Writing Memtable-local@xyz.."

Hi all, anyone knows what exactly happens when I see *Writing Memtable-local@57746066(0.472KiB serialized bytes, 15 ops, 0%/0% of on/off-heap limit)* during startup of C* processes in the cassandra-log? When updating our 10-node cluster I see this for +10mins as last log entry. There's some diskio

Data loss after system_keyspace-table removal?

Hi experts! Seems, that we have a data loss after a rolling update of our Cassandra 2.2.7 nodes. The nodes failed to start with an exception: IllegalStateException: empty rows returned when reading system.schema_keyspaces à ( https://issues.apache.org/jira/browse/CASSANDRA-12351) *Workarou