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0152c000bb
The commitlog api originally implied that the commitlog_directory would contain files from a single commitlog instance. This is checked in segment_manager::list_descriptors, if it encounters a file with an unknown prefix, an exception occurs in commitlog::descriptor::descriptor, which is logged with the WARN level. A new schema commitlog was added recently, which shares the filesystem directory with the main commitlog. This causes warnings to be emitted on each boot. This patch solves the warnings problem by moving the schema commitlog to a separate directory. In addition, the user can employ the new schema_commitlog_directory parameter to move the schema commitlog to another disk drive. By default, the schema commitlog directory is nested in the commitlog_directory. This can help avoid problems during an upgrade if the commitlog_directory in the custom scylla.yaml is located on a separate disk partition. This is expected to be released in 5.3. As #13134 (raft tables->schema commitlog) is also scheduled for 5.3, and it already requires a clean rolling restart (no cl segments to replay), we don't need to specifically handle upgrade here. Fixes: #11867