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binlog_path
Binary log (aka transaction log) files path. Optional, default is build-time configured data directory. Introduced in version 1.10-beta.
Binary logs are used for crash recovery of RT index data, and also of attributes updates of plain disk indices that would otherwise only be stored in RAM until flush. When logging is enabled, every transaction COMMIT-ted into RT index gets written into a log file. Logs are then automatically replayed on startup after an unclean shutdown, recovering the logged changes.
binlog_path directive specifies the binary log
files location. It should contain just the path; searchd
will create and unlink multiple binlog.* files in that path as necessary
(binlog data, metadata, and lock files, etc).
Empty value disables binary logging. That improves performance, but puts RT index data at risk.
WARNING! It is strongly recommended to always explicitly define 'binlog_path' option in your config. Otherwise, the default path, which in most cases is the same as working folder, may point to the folder with no write access (for example, /usr/local/var/data). In this case, the searchd will not start at all.
Example:
binlog_path = # disable logging
binlog_path = /var/data # /var/data/binlog.001 etc will be created
