################################ GENERAL ##################################### # By default kvrocks listens for connections from localhost interface. # It is possible to listen to just one or multiple interfaces using # the "bind" configuration directive, followed by one or more IP addresses. # # Examples: # # bind 192.168.1.100 10.0.0.1 # bind 127.0.0.1 ::1 # bind 0.0.0.0 # bind 127.0.0.1 # Unix socket. # # Specify the path for the unix socket that will be used to listen for # incoming connections. There is no default, so kvrocks will not listen # on a unix socket when not specified. # unixsocket full_index.sock unixsocketperm 777 # Accept connections on the specified port, default is 6666. # port 6666 # Close the connection after a client is idle for N seconds (0 to disable) timeout 0 # The number of worker's threads, increase or decrease would affect the performance. workers 8 # By default, kvrocks does not run as a daemon. Use 'yes' if you need it. # Note that kvrocks will write a PID file in /var/run/kvrocks.pid when daemonized daemonize yes # Kvrocks implements the cluster solution that is similar to the Redis cluster solution. # You can get cluster information by CLUSTER NODES|SLOTS|INFO command, it also is # adapted to redis-cli, redis-benchmark, Redis cluster SDK, and Redis cluster proxy. # But kvrocks doesn't support communicating with each other, so you must set # cluster topology by CLUSTER SETNODES|SETNODEID commands, more details: #219. # # PLEASE NOTE: # If you enable cluster, kvrocks will encode key with its slot id calculated by # CRC16 and modulo 16384, encoding key with its slot id makes it efficient to # migrate keys based on the slot. So if you enabled at first time, cluster mode must # not be disabled after restarting, and vice versa. That is to say, data is not # compatible between standalone mode with cluster mode, you must migrate data # if you want to change mode, otherwise, kvrocks will make data corrupt. # # Default: no cluster-enabled no # By default, namespaces are stored in the configuration file and won't be replicated # to replicas. This option allows to change this behavior, so that namespaces are also # propagated to slaves. Note that: # 1) it won't replicate the 'masterauth' to prevent breaking master/replica replication # 2) it will overwrite replica's namespace with master's namespace, so be careful of in-using namespaces # 3) cannot switch off the namespace replication once it's enabled # # Default: no repl-namespace-enabled no # Persist the cluster nodes topology in local file($dir/nodes.conf). This configuration # takes effect only if the cluster mode was enabled. # # If yes, it will try to load the cluster topology from the local file when starting, # and dump the cluster nodes into the file if it was changed. # # Default: yes persist-cluster-nodes-enabled yes # Set the max number of connected clients at the same time. By default # this limit is set to 10000 clients. However, if the server is not # able to configure the process file limit to allow for the specified limit # the max number of allowed clients is set to the current file limit # # Once the limit is reached the server will close all the new connections sending # an error 'max number of clients reached'. # maxclients 10000 # Require clients to issue AUTH before processing any other # commands. This might be useful in environments in which you do not trust # others with access to the host running kvrocks. # # This should stay commented out for backward compatibility and because most # people do not need auth (e.g. they run their own servers). # # Warning: since kvrocks is pretty fast an outside user can try up to # 150k passwords per second against a good box. This means that you should # use a very strong password otherwise it will be very easy to break. # # requirepass foobared # If the master is password protected (using the "masterauth" configuration # directive below) it is possible to tell the slave to authenticate before # starting the replication synchronization process. Otherwise, the master will # refuse the slave request. # # masterauth foobared # Master-Salve replication would check db name is matched. if not, the slave should # refuse to sync the db from master. Don't use the default value, set the db-name to identify # the cluster. db-name change.me.db # The working directory # # The DB will be written inside this directory # Note that you must specify a directory here, not a file name. dir ./ # You can configure where to store your server logs by the log-dir. # If you don't specify one, we will use the above `dir` as our default log directory. # We also can send logs to stdout/stderr is as simple as: # log-dir stdout # Log level # Possible values: info, warning, error, fatal # Default: info log-level info # You can configure log-retention-days to control whether to enable the log cleaner # and the maximum retention days that the INFO level logs will be kept. # # if set to -1, that means to disable the log cleaner. # if set to 0, all previous INFO level logs will be immediately removed. # if set to between 0 to INT_MAX, that means it will retent latest N(log-retention-days) day logs. # By default the log-retention-days is -1. log-retention-days -1 # When running in daemonize mode, kvrocks writes a PID file in ${CONFIG_DIR}/kvrocks.pid by # default. You can specify a custom pid file location here. pidfile kvrocks.pid # You can configure a slave instance to accept writes or not. Writing against # a slave instance may be useful to store some ephemeral data (because data # written on a slave will be easily deleted after resync with the master) but # may also cause problems if clients are writing to it because of a # misconfiguration. slave-read-only yes # The slave priority is an integer number published by Kvrocks in the INFO output. # It is used by Redis Sentinel in order to select a slave to promote into a # master if the master is no longer working correctly. # # A slave with a low priority number is considered better for promotion, so # for instance if there are three slave with priority 10, 100, 25 Sentinel will # pick the one with priority 10, that is the lowest. # # However a special priority of 0 marks the replica as not able to perform the # role of master, so a slave with priority of 0 will never be selected by # Redis Sentinel for promotion. # # By default the priority is 100. slave-priority 100 # TCP listen() backlog. # # In high requests-per-second environments you need an high backlog in order # to avoid slow clients connections issues. Note that the Linux kernel # will silently truncate it to the value of /proc/sys/net/core/somaxconn so # make sure to raise both the value of somaxconn and tcp_max_syn_backlog # in order to Get the desired effect. tcp-backlog 511 # If the master is an old version, it may have specified replication threads # that use 'port + 1' as listening port, but in new versions, we don't use # extra port to implement replication. In order to allow the new replicas to # copy old masters, you should indicate that the master uses replication port # or not. # If yes, that indicates master uses replication port and replicas will connect # to 'master's listening port + 1' when synchronization. # If no, that indicates master doesn't use replication port and replicas will # connect 'master's listening port' when synchronization. master-use-repl-port no # Currently, master only checks sequence number when replica asks for PSYNC, # that is not enough since they may have different replication histories even # the replica asking sequence is in the range of the master current WAL. # # We design 'Replication Sequence ID' PSYNC, we add unique replication id for # every write batch (the operation of each command on the storage engine), so # the combination of replication id and sequence is unique for write batch. # The master can identify whether the replica has the same replication history # by checking replication id and sequence. # # By default, it is not enabled since this stricter check may easily lead to # full synchronization. use-rsid-psync no # Master-Slave replication. Use slaveof to make a kvrocks instance a copy of # another kvrocks server. A few things to understand ASAP about kvrocks replication. # # 1) Kvrocks replication is asynchronous, but you can configure a master to # stop accepting writes if it appears to be not connected with at least # a given number of slaves. # 2) Kvrocks slaves are able to perform a partial resynchronization with the # master if the replication link is lost for a relatively small amount of # time. You may want to configure the replication backlog size (see the next # sections of this file) with a sensible value depending on your needs. # 3) Replication is automatic and does not need user intervention. After a # network partition slaves automatically try to reconnect to masters # and resynchronize with them. # # slaveof # slaveof 127.0.0.1 6379 # When a slave loses its connection with the master, or when the replication # is still in progress, the slave can act in two different ways: # # 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will # still reply to client requests, possibly with out-of-date data, or the # data set may just be empty if this is the first synchronization. # # 2) if slave-serve-stale-data is set to 'no' the slave will reply with # an error "SYNC with master in progress" to all kinds of commands # but to INFO and SLAVEOF. # slave-serve-stale-data yes # To guarantee slave's data safe and serve when it is in full synchronization # state, slave still keep itself data. But this way needs to occupy much disk # space, so we provide a way to reduce disk occupation, slave will delete itself # entire database before fetching files from master during full synchronization. # If you want to enable this way, you can set 'slave-delete-db-before-fullsync' # to yes, but you must know that database will be lost if master is down during # full synchronization, unless you have a backup of database. # # This option is similar redis replicas RDB diskless load option: # repl-diskless-load on-empty-db # # Default: no slave-empty-db-before-fullsync no # A Kvrocks master is able to list the address and port of the attached # replicas in different ways. For example the "INFO replication" section # offers this information, which is used, among other tools, by # Redis Sentinel in order to discover replica instances. # Another place where this info is available is in the output of the # "ROLE" command of a master. # # The listed IP address and port normally reported by a replica is # obtained in the following way: # # IP: The address is auto detected by checking the peer address # of the socket used by the replica to connect with the master. # # Port: The port is communicated by the replica during the replication # handshake, and is normally the port that the replica is using to # listen for connections. # # However when port forwarding or Network Address Translation (NAT) is # used, the replica may actually be reachable via different IP and port # pairs. The following two options can be used by a replica in order to # report to its master a specific set of IP and port, so that both INFO # and ROLE will report those values. # # There is no need to use both the options if you need to override just # the port or the IP address. # # replica-announce-ip 5.5.5.5 # replica-announce-port 1234 # If replicas need full synchronization with master, master need to create # checkpoint for feeding replicas, and replicas also stage a checkpoint of # the master. If we also keep the backup, it maybe occupy extra disk space. # You can enable 'purge-backup-on-fullsync' if disk is not sufficient, but # that may cause remote backup copy failing. # # Default: no purge-backup-on-fullsync no # The maximum allowed rate (in MB/s) that should be used by replication. # If the rate exceeds max-replication-mb, replication will slow down. # Default: 0 (i.e. no limit) max-replication-mb 0 # The maximum allowed aggregated write rate of flush and compaction (in MB/s). # If the rate exceeds max-io-mb, io will slow down. # 0 is no limit # Default: 0 max-io-mb 0 # The maximum allowed space (in GB) that should be used by RocksDB. # If the total size of the SST files exceeds max_allowed_space, writes to RocksDB will fail. # Please see: https://github.com/facebook/rocksdb/wiki/Managing-Disk-Space-Utilization # Default: 0 (i.e. no limit) max-db-size 0 # The maximum backup to keep, server cron would run every minutes to check the num of current # backup, and purge the old backup if exceed the max backup num to keep. If max-backup-to-keep # is 0, no backup would be kept. But now, we only support 0 or 1. max-backup-to-keep 1 # The maximum hours to keep the backup. If max-backup-keep-hours is 0, wouldn't purge any backup. # default: 1 day max-backup-keep-hours 24 # max-bitmap-to-string-mb use to limit the max size of bitmap to string transformation(MB). # # Default: 16 max-bitmap-to-string-mb 16 # Whether to enable SCAN-like cursor compatible with Redis. # If enabled, the cursor will be unsigned 64-bit integers. # If disabled, the cursor will be a string. # Default: no redis-cursor-compatible yes # Maximum nesting depth allowed when parsing and serializing # JSON documents while using JSON commands like JSON.SET. # Default: 1024 json-max-nesting-depth 1024 # The underlying storage format of JSON data type # NOTE: This option only affects newly written/updated key-values # The CBOR format may reduce the storage size and speed up JSON commands # Available values: json, cbor # Default: json json-storage-format json ################################## TLS ################################### # By default, TLS/SSL is disabled, i.e. `tls-port` is set to 0. # To enable it, `tls-port` can be used to define TLS-listening ports. # tls-port 0 # Configure a X.509 certificate and private key to use for authenticating the # server to connected clients, masters or cluster peers. # These files should be PEM formatted. # # tls-cert-file kvrocks.crt # tls-key-file kvrocks.key # If the key file is encrypted using a passphrase, it can be included here # as well. # # tls-key-file-pass secret # Configure a CA certificate(s) bundle or directory to authenticate TLS/SSL # clients and peers. Kvrocks requires an explicit configuration of at least one # of these, and will not implicitly use the system wide configuration. # # tls-ca-cert-file ca.crt # tls-ca-cert-dir /etc/ssl/certs # By default, clients on a TLS port are required # to authenticate using valid client side certificates. # # If "no" is specified, client certificates are not required and not accepted. # If "optional" is specified, client certificates are accepted and must be # valid if provided, but are not required. # # tls-auth-clients no # tls-auth-clients optional # By default, only TLSv1.2 and TLSv1.3 are enabled and it is highly recommended # that older formally deprecated versions are kept disabled to reduce the attack surface. # You can explicitly specify TLS versions to support. # Allowed values are case insensitive and include "TLSv1", "TLSv1.1", "TLSv1.2", # "TLSv1.3" (OpenSSL >= 1.1.1) or any combination. # To enable only TLSv1.2 and TLSv1.3, use: # # tls-protocols "TLSv1.2 TLSv1.3" # Configure allowed ciphers. See the ciphers(1ssl) manpage for more information # about the syntax of this string. # # Note: this configuration applies only to <= TLSv1.2. # # tls-ciphers DEFAULT:!MEDIUM # Configure allowed TLSv1.3 ciphersuites. See the ciphers(1ssl) manpage for more # information about the syntax of this string, and specifically for TLSv1.3 # ciphersuites. # # tls-ciphersuites TLS_CHACHA20_POLY1305_SHA256 # When choosing a cipher, use the server's preference instead of the client # preference. By default, the server follows the client's preference. # # tls-prefer-server-ciphers yes # By default, TLS session caching is enabled to allow faster and less expensive # reconnections by clients that support it. Use the following directive to disable # caching. # # tls-session-caching no # Change the default number of TLS sessions cached. A zero value sets the cache # to unlimited size. The default size is 20480. # # tls-session-cache-size 5000 # Change the default timeout of cached TLS sessions. The default timeout is 300 # seconds. # # tls-session-cache-timeout 60 # By default, a replica does not attempt to establish a TLS connection # with its master. # # Use the following directive to enable TLS on replication links. # # tls-replication yes ################################## SLOW LOG ################################### # The Kvrocks Slow Log is a mechanism to log queries that exceeded a specified # execution time. The execution time does not include the I/O operations # like talking with the client, sending the reply and so forth, # but just the time needed to actually execute the command (this is the only # stage of command execution where the thread is blocked and can not serve # other requests in the meantime). # # You can configure the slow log with two parameters: one tells Kvrocks # what is the execution time, in microseconds, to exceed in order for the # command to get logged, and the other parameter is the length of the # slow log. When a new command is logged the oldest one is removed from the # queue of logged commands. # The following time is expressed in microseconds, so 1000000 is equivalent # to one second. Note that -1 value disables the slow log, while # a value of zero forces the logging of every command. slowlog-log-slower-than 100000 # There is no limit to this length. Just be aware that it will consume memory. # You can reclaim memory used by the slow log with SLOWLOG RESET. slowlog-max-len 128 # If you run kvrocks from upstart or systemd, kvrocks can interact with your # supervision tree. Options: # supervised no - no supervision interaction # supervised upstart - signal upstart by putting kvrocks into SIGSTOP mode # supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET # supervised auto - detect upstart or systemd method based on # UPSTART_JOB or NOTIFY_SOCKET environment variables # Note: these supervision methods only signal "process is ready." # They do not enable continuous liveness pings back to your supervisor. supervised no ################################## PERF LOG ################################### # The Kvrocks Perf Log is a mechanism to log queries' performance context that # exceeded a specified execution time. This mechanism uses rocksdb's # Perf Context and IO Stats Context, Please see: # https://github.com/facebook/rocksdb/wiki/Perf-Context-and-IO-Stats-Context # # This mechanism is enabled when profiling-sample-commands is not empty and # profiling-sample-ratio greater than 0. # It is important to note that this mechanism affects performance, but it is # useful for troubleshooting performance bottlenecks, so it should only be # enabled when performance problems occur. # The name of the commands you want to record. Must be original name of # commands supported by Kvrocks. Use ',' to separate multiple commands and # use '*' to record all commands supported by Kvrocks. # Example: # - Single command: profiling-sample-commands get # - Multiple commands: profiling-sample-commands get,mget,hget # # Default: empty # profiling-sample-commands "" # Ratio of the samples would be recorded. It is a number between 0 and 100. # We simply use the rand to determine whether to record the sample or not. # # Default: 0 profiling-sample-ratio 0 # There is no limit to this length. Just be aware that it will consume memory. # You can reclaim memory used by the perf log with PERFLOG RESET. # # Default: 256 profiling-sample-record-max-len 256 # profiling-sample-record-threshold-ms use to tell the kvrocks when to record. # # Default: 100 millisecond profiling-sample-record-threshold-ms 100 ################################## CRON ################################### # Compact Scheduler, auto compact at schedule time # time expression format is the same as crontab(currently only support * and int) # e.g. compact-cron 0 3 * * * 0 4 * * * # would compact the db at 3am and 4am everyday # compact-cron 0 3 * * * # The hour range that compaction checker would be active # e.g. compaction-checker-range 0-7 means compaction checker would be worker between # 0-7am every day. compaction-checker-range 0-7 # When the compaction checker is triggered, the db will periodically pick the SST file # with the highest "deleted percentage" (i.e. the percentage of deleted keys in the SST # file) to compact, in order to free disk space. # However, if a specific SST file was created more than "force-compact-file-age" seconds # ago, and its percentage of deleted keys is higher than # "force-compact-file-min-deleted-percentage", it will be forcely compacted as well. # Default: 172800 seconds; Range: [60, INT64_MAX]; # force-compact-file-age 172800 # Default: 10 %; Range: [1, 100]; # force-compact-file-min-deleted-percentage 10 # Bgsave scheduler, auto bgsave at scheduled time # time expression format is the same as crontab(currently only support * and int) # e.g. bgsave-cron 0 3 * * * 0 4 * * * # would bgsave the db at 3am and 4am every day # Command renaming. # # It is possible to change the name of dangerous commands in a shared # environment. For instance, the KEYS command may be renamed into something # hard to guess so that it will still be available for internal-use tools # but not available for general clients. # # Example: # # rename-command KEYS b840fc02d524045429941cc15f59e41cb7be6c52 # # It is also possible to completely kill a command by renaming it into # an empty string: # # rename-command KEYS "" ################################ MIGRATE ##################################### # If the network bandwidth is completely consumed by the migration task, # it will affect the availability of kvrocks. To avoid this situation, # migrate-speed is adopted to limit the migrating speed. # Migrating speed is limited by controlling the duration between sending data, # the duration is calculated by: 1000000 * migrate-pipeline-size / migrate-speed (us). # Value: [0,INT_MAX], 0 means no limit # # Default: 4096 migrate-speed 4096 # In order to reduce data transmission times and improve the efficiency of data migration, # pipeline is adopted to send multiple data at once. Pipeline size can be set by this option. # Value: [1, INT_MAX], it can't be 0 # # Default: 16 migrate-pipeline-size 16 # In order to reduce the write forbidden time during migrating slot, we will migrate the incremental # data several times to reduce the amount of incremental data. Until the quantity of incremental # data is reduced to a certain threshold, slot will be forbidden write. The threshold is set by # this option. # Value: [1, INT_MAX], it can't be 0 # # Default: 10000 migrate-sequence-gap 10000 ################################ ROCKSDB ##################################### # Specify the capacity of column family block cache. A larger block cache # may make requests faster while more keys would be cached. Max Size is 400*1024. # Default: 4096MB rocksdb.block_cache_size 4096 # A global cache for table-level rows in RocksDB. If almost always point # lookups, enlarging row cache may improve read performance. Otherwise, # if we enlarge this value, we can lessen metadata/subkey block cache size. # # Default: 0 (disabled) rocksdb.row_cache_size 0 # Number of open files that can be used by the DB. You may need to # increase this if your database has a large working set. Value -1 means # files opened are always kept open. You can estimate number of files based # on target_file_size_base and target_file_size_multiplier for level-based # compaction. For universal-style compaction, you can usually set it to -1. # Default: 8096 rocksdb.max_open_files 8096 # Amount of data to build up in memory (backed by an unsorted log # on disk) before converting to a sorted on-disk file. # # Larger values increase performance, especially during bulk loads. # Up to max_write_buffer_number write buffers may be held in memory # at the same time, # so you may wish to adjust this parameter to control memory usage. # Also, a larger write buffer will result in a longer recovery time # the next time the database is opened. # # Note that write_buffer_size is enforced per column family. # See db_write_buffer_size for sharing memory across column families. # default is 64MB rocksdb.write_buffer_size 64 # Target file size for compaction, target file size for Level N can be calculated # by target_file_size_base * (target_file_size_multiplier ^ (L-1)) # # Default: 128MB rocksdb.target_file_size_base 128 # The maximum number of write buffers that are built up in memory. # The default and the minimum number is 2, so that when 1 write buffer # is being flushed to storage, new writes can continue to the other # write buffer. # If max_write_buffer_number > 3, writing will be slowed down to # options.delayed_write_rate if we are writing to the last write buffer # allowed. rocksdb.max_write_buffer_number 4 # Maximum number of concurrent background jobs (compactions and flushes). # For backwards compatibility we will set `max_background_jobs = # max_background_compactions + max_background_flushes` in the case where user # sets at least one of `max_background_compactions` or `max_background_flushes` # (we replace -1 by 1 in case one option is unset). rocksdb.max_background_jobs 4 # DEPRECATED: it is automatically decided based on the value of rocksdb.max_background_jobs # Maximum number of concurrent background compaction jobs, submitted to # the default LOW priority thread pool. rocksdb.max_background_compactions -1 # DEPRECATED: it is automatically decided based on the value of rocksdb.max_background_jobs # Maximum number of concurrent background memtable flush jobs, submitted by # default to the HIGH priority thread pool. If the HIGH priority thread pool # is configured to have zero threads, flush jobs will share the LOW priority # thread pool with compaction jobs. rocksdb.max_background_flushes -1 # This value represents the maximum number of threads that will # concurrently perform a compaction job by breaking it into multiple, # smaller ones that are run simultaneously. # Default: 2 rocksdb.max_sub_compactions 2 # In order to limit the size of WALs, RocksDB uses DBOptions::max_total_wal_size # as the trigger of column family flush. Once WALs exceed this size, RocksDB # will start forcing the flush of column families to allow deletion of some # oldest WALs. This config can be useful when column families are updated at # non-uniform frequencies. If there's no size limit, users may need to keep # really old WALs when the infrequently-updated column families hasn't flushed # for a while. # # In kvrocks, we use multiple column families to store metadata, subkeys, etc. # If users always use string type, but use list, hash and other complex data types # infrequently, there will be a lot of old WALs if we don't set size limit # (0 by default in rocksdb), because rocksdb will dynamically choose the WAL size # limit to be [sum of all write_buffer_size * max_write_buffer_number] * 4 if set to 0. # # Moreover, you should increase this value if you already set rocksdb.write_buffer_size # to a big value, to avoid influencing the effect of rocksdb.write_buffer_size and # rocksdb.max_write_buffer_number. # # default is 512MB rocksdb.max_total_wal_size 512 # We implement the replication with rocksdb WAL, it would trigger full sync when the seq was out of range. # wal_ttl_seconds and wal_size_limit_mb would affect how archived logs will be deleted. # If WAL_ttl_seconds is not 0, then WAL files will be checked every WAL_ttl_seconds / 2 and those that # are older than WAL_ttl_seconds will be deleted# # # Default: 3 Hours rocksdb.wal_ttl_seconds 10800 # If WAL_ttl_seconds is 0 and WAL_size_limit_MB is not 0, # WAL files will be checked every 10 min and if total size is greater # then WAL_size_limit_MB, they will be deleted starting with the # earliest until size_limit is met. All empty files will be deleted # Default: 16GB rocksdb.wal_size_limit_mb 16384 # Approximate size of user data packed per block. Note that the # block size specified here corresponds to uncompressed data. The # actual size of the unit read from disk may be smaller if # compression is enabled. # # Default: 16KB rocksdb.block_size 16384 # Indicating if we'd put index/filter blocks to the block cache # # Default: yes rocksdb.cache_index_and_filter_blocks yes # Specify the compression to use. Only compress level greater # than 2 to improve performance. # Accept value: "no", "snappy", "lz4", "zstd", "zlib" # default snappy rocksdb.compression snappy # If non-zero, we perform bigger reads when doing compaction. If you're # running RocksDB on spinning disks, you should set this to at least 2MB. # That way RocksDB's compaction is doing sequential instead of random reads. # When non-zero, we also force new_table_reader_for_compaction_inputs to # true. # # Default: 2 MB rocksdb.compaction_readahead_size 2097152 # he limited write rate to DB if soft_pending_compaction_bytes_limit or # level0_slowdown_writes_trigger is triggered. # If the value is 0, we will infer a value from `rater_limiter` value # if it is not empty, or 16MB if `rater_limiter` is empty. Note that # if users change the rate in `rate_limiter` after DB is opened, # `delayed_write_rate` won't be adjusted. # rocksdb.delayed_write_rate 0 # If enable_pipelined_write is true, separate write thread queue is # maintained for WAL write and memtable write. # # Default: no rocksdb.enable_pipelined_write no # Soft limit on number of level-0 files. We start slowing down writes at this # point. A value <0 means that no writing slow down will be triggered by # number of files in level-0. # # Default: 20 rocksdb.level0_slowdown_writes_trigger 20 # Maximum number of level-0 files. We stop writes at this point. # # Default: 40 rocksdb.level0_stop_writes_trigger 40 # Number of files to trigger level-0 compaction. # # Default: 4 rocksdb.level0_file_num_compaction_trigger 4 # if not zero, dump rocksdb.stats to LOG every stats_dump_period_sec # # Default: 0 rocksdb.stats_dump_period_sec 0 # if yes, the auto compaction would be disabled, but the manual compaction remain works # # Default: no rocksdb.disable_auto_compactions no # BlobDB(key-value separation) is essentially RocksDB for large-value use cases. # Since 6.18.0, The new implementation is integrated into the RocksDB core. # When set, large values (blobs) are written to separate blob files, and only # pointers to them are stored in SST files. This can reduce write amplification # for large-value use cases at the cost of introducing a level of indirection # for reads. Please see: https://github.com/facebook/rocksdb/wiki/BlobDB. # # Note that when enable_blob_files is set to yes, BlobDB-related configuration # items will take effect. # # Default: no rocksdb.enable_blob_files no # The size of the smallest value to be stored separately in a blob file. Values # which have an uncompressed size smaller than this threshold are stored alongside # the keys in SST files in the usual fashion. # # Default: 4096 byte, 0 means that all values are stored in blob files rocksdb.min_blob_size 4096 # The size limit for blob files. When writing blob files, a new file is # opened once this limit is reached. # # Default: 268435456 bytes rocksdb.blob_file_size 268435456 # Enables garbage collection of blobs. Valid blobs residing in blob files # older than a cutoff get relocated to new files as they are encountered # during compaction, which makes it possible to clean up blob files once # they contain nothing but obsolete/garbage blobs. # See also rocksdb.blob_garbage_collection_age_cutoff below. # # Default: yes rocksdb.enable_blob_garbage_collection yes # The percentage cutoff in terms of blob file age for garbage collection. # Blobs in the oldest N blob files will be relocated when encountered during # compaction, where N = (garbage_collection_cutoff/100) * number_of_blob_files. # Note that this value must belong to [0, 100]. # # Default: 25 rocksdb.blob_garbage_collection_age_cutoff 25 # The purpose of the following three options are to dynamically adjust the upper limit of # the data that each layer can store according to the size of the different # layers of the LSM. Enabling this option will bring some improvements in # deletion efficiency and space amplification, but it will lose a certain # amount of read performance. # If you want to know more details about Levels' Target Size, you can read RocksDB wiki: # https://github.com/facebook/rocksdb/wiki/Leveled-Compaction#levels-target-size # # Default: yes rocksdb.level_compaction_dynamic_level_bytes yes # The total file size of level-1 sst. # # Default: 268435456 bytes rocksdb.max_bytes_for_level_base 268435456 # Multiplication factor for the total file size of L(n+1) layers. # This option is a double type number in RocksDB, but kvrocks is # not support the double data type number yet, so we use integer # number instead of double currently. # # Default: 10 rocksdb.max_bytes_for_level_multiplier 10 # This feature only takes effect in Iterators and MultiGet. # If yes, RocksDB will try to read asynchronously and in parallel as much as possible to hide IO latency. # In iterators, it will prefetch data asynchronously in the background for each file being iterated on. # In MultiGet, it will read the necessary data blocks from those files in parallel as much as possible. # Default no rocksdb.read_options.async_io no # If yes, the write will be flushed from the operating system # buffer cache before the write is considered complete. # If this flag is enabled, writes will be slower. # If this flag is disabled, and the machine crashes, some recent # rites may be lost. Note that if it is just the process that # crashes (i.e., the machine does not reboot), no writes will be # lost even if sync==false. # # Default: no rocksdb.write_options.sync no # If yes, writes will not first go to the write ahead log, # and the write may get lost after a crash. # # Default: no rocksdb.write_options.disable_wal no # If enabled and we need to wait or sleep for the write request, fails # immediately. # # Default: no rocksdb.write_options.no_slowdown no # If enabled, write requests are of lower priority if compaction is # behind. In this case, no_slowdown = true, the request will be canceled # immediately. Otherwise, it will be slowed down. # The slowdown value is determined by RocksDB to guarantee # it introduces minimum impacts to high priority writes. # # Default: no rocksdb.write_options.low_pri no # If enabled, this writebatch will maintain the last insert positions of each # memtable as hints in concurrent write. It can improve write performance # in concurrent writes if keys in one writebatch are sequential. # # Default: no rocksdb.write_options.memtable_insert_hint_per_batch no # Support RocksDB auto-tune rate limiter for the background IO # if enabled, Rate limiter will limit the compaction write if flush write is high # Please see https://rocksdb.org/blog/2017/12/18/17-auto-tuned-rate-limiter.html # # Default: yes rocksdb.rate_limiter_auto_tuned yes # Enable this option will schedule the deletion of obsolete files in a background thread # on iterator destruction. It can reduce the latency if there are many files to be removed. # see https://github.com/facebook/rocksdb/wiki/IO#avoid-blocking-io # # Default: yes # rocksdb.avoid_unnecessary_blocking_io yes ################################ NAMESPACE ##################################### # namespace.test change.me backup-dir .//backup