PD Config

Learn how to configure the Placement Driver.

PD (Placement Driver) is the cluster manager of TiKV. This document describes how to configure PD parameters that are not included in command-line parameters. See the default PD configuration file.

lease

  • The timeout of the PD Leader Key lease. After the timeout, the system re-elects a Leader.
  • Default value: 3
  • unit: second

tso-save-interval

  • The interval for PD to allocate TSOs for persistent storage in etcd
  • Default value: "3s"

initial-cluster-state

  • The initial state of the cluster
  • Default value: "new"

enable-prevote

  • Enables or disables raft prevote
  • Default value: true

quota-backend-bytes

  • The storage size of the meta-information database, which is 8GiB by default
  • Default value: 8589934592

auto-compaction-mod

  • The automatic compaction modes of the meta-information database
  • Available options: periodic (by cycle) and revision (by version number).
  • Default value: periodic

auto-compaction-retention

  • The time interval for automatic compaction of the meta-information database when auto-compaction-retention is periodic. When the compaction mode is set to revision, this parameter indicates the version number for the automatic compaction.
  • Default value: 1h

force-new-cluster

  • Determines whether to force PD to start as a new cluster and modify the number of Raft members to 1
  • Default value: false

tick-interval

  • The tick period of etcd Raft
  • Default value: "100ms"

election-interval

  • The timeout for the etcd leader election
  • Default value: "3s"

use-region-storage

  • Enables or disables independent Region storage
  • Default value: false

security

Configuration items related to security

cacert-path

  • The path of the CA file
  • Default value: "”

cert-path

  • The path of the Privacy Enhanced Mail (PEM) file that contains the X509 certificate
  • Default value: "”

key-path

  • The path of the PEM file that contains the X509 key
  • Default value: "”

log

Configuration items related to log

format

  • The log format, which can be specified as “text”, “json”, or “console”
  • Default value: "text"

disable-timestamp

  • Whether to disable the automatically generated timestamp in the log
  • Default value: false

log.file

Configuration items related to the log file

max-size

  • The maximum size of a single log file. When this value is exceeded, the system automatically splits the log into several files.
  • Default value: 300
  • Unit: MiB
  • Minimum value: 1

max-days

  • The maximum number of days in which a log is kept
  • Default value: 28
  • Minimum value: 1

max-backups

  • The maximum number of log files to keep
  • Default value: 7
  • Minimum value: 1

metric

Configuration items related to monitoring

interval

  • The interval at which monitoring metric data is pushed to Prometheus
  • Default value: "15s"

schedule

Configuration items related to scheduling

max-merge-region-size

  • Controls the size limit of Region Merge. When the Region size is greater than the specified value, PD does not merge the Region with the adjacent Regions.
  • Default value: 20

max-merge-region-keys

  • Specifies the upper limit of the Region Merge key. When the Region key is greater than the specified value, the PD does not merge the Region with its adjacent Regions.
  • Default value: 200000

patrol-region-interval

  • Controls the running frequency at which replicaChecker checks the health state of a Region. The smaller this value is, the faster replicaChecker runs. Normally, you do not need to adjust this parameter.
  • Default value: "100ms"

split-merge-interval

  • Controls the time interval between the split and merge operations on the same Region. That means a newly split Region will not be merged for a while.
  • Default value: 1h

max-snapshot-count

  • Control the maximum number of snapshots that a single store receives or sends at the same time. PD schedulers depend on this configuration to prevent the resources used for normal traffic from being preempted.
  • Default value value: 3

max-pending-peer-count

  • Controls the maximum number of pending peers in a single store. PD schedulers depend on this configuration to prevent too many Regions with outdated logs from being generated on some nodes.
  • Default value: 16

max-store-down-time

  • The downtime after which PD judges that the disconnected store can not be recovered. When PD fails to receive the heartbeat from a store after the specified period of time, it adds replicas at other nodes.
  • Default value: "30m"

leader-schedule-limit

  • The number of Leader scheduling tasks performed at the same time
  • Default value: 4

region-schedule-limit

  • The number of Region scheduling tasks performed at the same time
  • Default value: 2048

replica-schedule-limit

  • The number of Replica scheduling tasks performed at the same time
  • Default value: 64

merge-schedule-limit

  • The number of the Region Merge scheduling tasks performed at the same time. Set this parameter to 0 to disable Region Merge.
  • Default value: 8

high-space-ratio

  • The threshold ratio below which the capacity of the store is sufficient
  • Default value: 0.7
  • Minimum value: greater than 0
  • Maximum value: less than 1

low-space-ratio

  • The threshold ratio above which the capacity of the store is insufficient
  • Default value: 0.8
  • Minimum value: greater than 0
  • Maximum value: less than 1

tolerant-size-ratio

  • Controls the balance buffer size
  • Default value: 0 (automatically adjusts the buffer size)
  • Minimum value: 0

disable-remove-down-replica

  • Determines whether to disable the feature that automatically removes DownReplica. When this parameter is set to true, PD does not automatically clean up the copy in the down state.
  • Default value: false

disable-replace-offline-replica

  • Determines whether to disable the feature that migrates OfflineReplica. When this parameter is set to true, PD does not migrate the replicas in the offline state.
  • Default value: false

disable-make-up-replica

  • Determines whether to disable the feature that automatically supplements replicas. When this parameter is set to true, PD does not supplement replicas for the Region with insufficient replicas.
  • Default value: false

disable-remove-extra-replica

  • Determines whether to disable the feature that removes extra replicas. When this parameter is set to true, PD does not remove the extra replicas from the Region with excessive replicas.
  • Default value: false

disable-location-replacement

  • Determines whether to disable isolation level check. When this parameter is set to true, PD does not increase the isolation level of the Region replicas through scheduling.
  • Default value: false

store-balance-rate

  • Determines the maximum number of operations related to adding peers within a minute
  • Default value: 15

replication

Configuration items related to replicas

max-replicas

  • The number of replicas
  • Default value: 3

location-labels

  • The topology information of a TiKV cluster
  • Default value: []

strictly-match-label

  • Enables the strict check for whether the TiKV label matches PD’s location-labels.
  • Default value: false

enable-placement-rules

  • Enables placement-rules.
  • Default value: false
  • An experimental feature of v4.0.

label-property

Configuration items related to labels

key

  • The label key for the store that rejected the Leader
  • Default value: ""

value

  • The label value for the store that rejected the Leader
  • Default value: ""