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PD Change Log

v3.0.0-beta

  • Add RegionStorage to store Region metadata separately #1237
  • Add shuffle hot Region scheduler #1361
  • Add scheduling parameter related metrics #1406
  • Add cluster label related metrics #1402
  • Add the importing data simulator #1263
  • Fix the Watch issue about leader election #1396

v2.1.2

  • Fix the Region information update issue about Region merge #1377

v2.1.1

  • Fix the issue that some configuration items cannot be set to 0 in the configuration file #1334
  • Check the undefined configuration when starting PD #1362
  • Avoid transferring the leader to a newly created peer, to optimize the possible delay #1339
  • Fix the issue that RaftCluster cannot stop caused by deadlock #1370

v2.1.0

v2.1.0-rc.5

  • Fix the issues related to pd-ctl reading the Region key #1298 #1299 #1308
  • Fix the issue that the regions/check API returns the wrong result #1311
  • Fix the issue that PD cannot restart join after a PD join failure #1279
  • Fix the issue that watch leader might lose events in some cases #1317

v2.1.0-rc.4

  • Fix the issue that the tombstone TiKV is not removed from Grafana #1261
  • Fix the data race issue when grpc-go configures the status #1265
  • Fix the issue that the PD server gets stuck caused by etcd startup failure #1267
  • Fix the issue that data race might occur during leader switching #1273
  • Fix the issue that extra warning logs might be output when TiKV becomes tombstone #1280

v2.1.0-rc.3

New feature

  • Add the API to get the Region list by size in reverse order #1254

Improvement

  • Return more detailed information in the Region API #1252

Bug fix

  • Fix the issue that adjacent-region-scheduler might lead to a crash after PD switches the leader #1250

v2.1.0-rc2

Features

  • Support the GetAllStores interface
  • Add the statistics of scheduling estimation in Simulator

Improvements

  • Optimize the handling process of down stores to make up replicas as soon as possible
  • Optimize the start of Coordinator to reduce the unnecessary scheduling caused by restarting PD
  • Optimize the memory usage to reduce the overhead caused by heartbeats
  • Optimize error handling and improve the log information
  • Support querying the Region information of a specific store in pd-ctl
  • Support querying the topN Region information based on version
  • Support more accurate TSO decoding in pd-ctl

Bug fix

  • Fix the issue that pd-ctl uses the hot store command to exit wrongly

v2.1.0-rc1

Features

  • Introduce the version control mechanism and support rolling update of the cluster with compatibility
  • Enable the region merge feature
  • Support the GetPrevRegion interface
  • Support splitting Regions in batch
  • Support storing the GC safepoint

Improvements

  • Optimize the issue that TSO allocation is affected by the system clock going backwards
  • Optimize the performance of handling Region hearbeats
  • Optimize the Region tree performance
  • Optimize the performance of computing hotspot statistics
  • Optimize returning the error code of API interface
  • Add options of controlling scheduling strategies
  • Prohibit using special characters in label
  • Improve the scheduling simulator
  • Support splitting Regions using statistics in pd-ctl
  • Support formatting JSON output by calling jq in pd-ctl
  • Add metrics about etcd Raft state machine

Bug fixes

  • Fix the issue that the namespace is not reloaded after switching Leader
  • Fix the issue that namespace scheduling exceeds the schedule limit
  • Fix the issue that hotspot scheduling exceeds the schedule limit
  • Fix the issue that wrong logs are output when the PD client closes
  • Fix the wrong statistics of Region heartbeat latency

v2.1.0-beta

Improvements

  • Enable Raft PreVote between PD nodes to avoid leader reelection when network recovers after network isolation
  • Optimize the issue that Balance Scheduler schedules small Regions frequently
  • Optimize the hotspot scheduler to improve its adaptability in traffic statistics information jitters
  • Skip the Regions with a large number of rows when scheduling region merge
  • Enable raft learner by default to lower the risk of unavailable data caused by machine failure during scheduling
  • Remove max-replica from pd-recover
  • Add Filter metrics

Bug Fixes

  • Fix the issue that Region information is not updated after tikv-ctl unsafe recovery
  • Fix the issue that TiKV disk space is used up caused by replica migration in some scenarios

Compatibility notes

  • Do not support rolling back to v2.0.x or earlier due to update of the new version storage engine
  • Enable raft learner by default in the new version of PD. If the cluster is upgraded from 1.x to 2.1, the machine should be stopped before upgrade or a rolling update should be first applied to TiKV and then PD

v2.0.4

Improvement

  • Improve the behavior of the unset scheduling argument max-pending-peer-count by changing it to no limit for the maximum number of PendingPeers

v2.0.3

Bug Fixes

  • Fix the issue about scheduling of the obsolete Regions
  • Fix the panic issue when collecting the hot-cache metrics in specific conditions

v2.0.2

Improvements

  • Make the balance leader scheduler filter the disconnected nodes
  • Make the tick interval of patrol Regions configurable
  • Modify the timeout of the transfer leader operator to 10s

Bug Fixes

  • Fix the issue that the label scheduler does not schedule when the cluster Regions are in an unhealthy state
  • Fix the improper scheduling issue of evict leader scheduler

v2.0.1

New Feature

  • Add the Scatter Range scheduler to balance Regions with the specified key range

Improvements

  • Optimize the scheduling of Merge Region to prevent the newly split Region from being merged
  • Add Learner related metrics

Bug Fixes

  • Fix the issue that the scheduler is mistakenly deleted after restart
  • Fix the error that occurs when parsing the configuration file
  • Fix the issue that the etcd leader and the PD leader are not synchronized
  • Fix the issue that Learner still appears after it is closed
  • Fix the issue that Regions fail to load because the packet size is too large

v2.0.0-GA

New Feature

  • Support using pd-ctl to scatter specified Regions for manually adjusting hotspot Regions in some cases

Improvements

  • Improve configuration check rules to prevent unreasonable scheduling configuration
  • Optimize the scheduling strategy when a TiKV node has insufficient space so as to prevent the disk from being fully occupied
  • Optimize hot-region scheduler execution efficiency and add more metrics
  • Optimize Region health check logic to avoid generating redundant schedule operators

v2.0.0-rc.5

New Feature

  • Support adding the learner node

Improvements

  • Optimize the Balance Region Scheduler to reduce scheduling overhead
  • Adjust the default value of schedule-limit configuration
  • Fix the compatibility issue when adding a new scheduler

Bug Fix

  • Fix the issue of allocating IDs frequently

v2.0.0-rc.4

New Feature

  • Support splitting Region manually to handle the hot spot in a single Region

Improvement

  • Optimize metrics

Bug Fix

  • Fix the issue that the label property is not displayed when pdctl runs config show all

v2.0.0-rc3

New Feature

  • Support Region Merge, to merge empty Regions or small Regions after deleting data

Improvements

  • Ignore the nodes that have a lot of pending peers during adding replicas, to improve the speed of restoring replicas or making nodes offline
  • Optimize the scheduling speed of leader balance in scenarios of unbalanced resources within different labels
  • Add more statistics about abnormal Regions

Bug Fix

  • Fix the frequent scheduling issue caused by a large number of empty Regions