force_recovery

If force_recovery equals true, Tarantool tries to continue if there is an error while reading a snapshot file (at server instance start) or a write-ahead log file (at server instance start or when applying an update at a replica): skips invalid records, reads as much data as possible and lets the process finish with a warning. Users can prevent the error from recurring by writing to the database and executing box.snapshot().

Otherwise, Tarantool aborts recovery if there is an error while reading.

Type: boolean
Default: false
Dynamic: no
rows_per_wal

How many log records to store in a single write-ahead log file. When this limit is reached, Tarantool creates another WAL file named <first-lsn-in-wal>.xlog. This can be useful for simple rsync-based backups.

Type: integer
Default: 500000
Dynamic: no
wal_max_size

The maximum number of bytes in a single write-ahead log file. When a request would cause an .xlog file to become larger than wal_max_size, Tarantool creates another WAL file – the same effect that happens when the rows_per_wal limit is reached.

Type: integer
Default: 268435456 (256 * 1024 * 1024)
Dynamic: no
snap_io_rate_limit

Reduce the throttling effect of box.snapshot on INSERT/UPDATE/DELETE performance by setting a limit on how many megabytes per second it can write to disk. The same can be achieved by splitting wal_dir and memtx_dir locations and moving snapshots to a separate disk. The limit also affects what box.stat.vinyl().regulator may show for the write rate of dumps to .run and .index files.

Type: float
Default: null
Dynamic: yes
wal_mode

Specify fiber-WAL-disk synchronization mode as:

  • none: write-ahead log is not maintained;
  • write: fibers wait for their data to be written to the write-ahead log (no fsync(2));
  • fsync: fibers wait for their data, fsync(2) follows each write(2);
Type: string
Default: “write”
Dynamic: yes
wal_dir_rescan_delay

Number of seconds between periodic scans of the write-ahead-log file directory, when checking for changes to write-ahead-log files for the sake of replication or hot standby.

Type: float
Default: 2
Dynamic: no