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DM Changelog

All notable changes to this project will be documented in this file.

[2.0.2] 2021-04-09

Improvements

  • Relay log GA
    • The relay log feature is no longer enabled by setting the source configuration file. Now, the feature is enabled by running commands in dmctl for specified DM-workers #1499
    • DM sends the commands query-status -s and purge-relay to all DM-workers that pull relay logs #1533
    • Align the relay unit‘s behavior of pulling and sending binlogs with that of the secondary MySQL database #1390
    • Reduce the scenarios where relay logs need to be purged #1400
    • Support sending heartbeat events when the relay log feature is enabled to display task progress with regular updates #1404
  • Optimistic sharding DDL mode
    • Optimize operations for resolving DDL conflicts #1496 #1506 #1518 #1551
    • Adjust the DDL coordination behavior in the optimistic mode to avoid data inconsistency in advance #1510 #1512
  • Support automatically recognizing the switching of upstream data sources when the source configuration needs no update, for example, when the IP address does not change #1364
  • Precheck the privileges of the upstream MySQL instance at a finer granularity #1336
  • Support configuring binlog event filtering rules in the source configuration file #1370
  • When binding an idle upstream data source to an idle DM-worker node, DM-master nodes firstly choose the most recent binding of that DM-worker node #1373
  • Improve the stability of DM automatically getting the SQL mode from the binlog file #1382 #1552
  • Support automatically parsing GTIDs of different formats in the source configuration file #1385
  • Extend DM-worker’s TTL for keepalive to reduce scheduling caused by poor network #1405
  • Support reporting an error when the configuration file contains configuration items that are not referenced #1410
  • Improve the display of a GTID set by sorting it in dictionary order #1424
  • Optimize monitoring and alerting rules #1438
  • Support manually transferring an upstream data source to a specified DM-worker #1492
  • Add configurations of etcd compaction and disk quota #1521

Bug fixes

  • Fix the issue of data loss during the full data migration occurred because DM frequently restarts the task #1378
  • Fix the issue that an incremental replication task fails to start when the binlog position is not specified together with GTID in the task configuration #1393
  • Fix the issue that DM-worker’s binding relationships become abnormal when the disk and network environments are poor #1396
  • Fix the issue that enabling the relay log feature might cause data loss when the GTIDs specified in upstream binlog previous_gtids events are not consecutive #1390 #1430
  • Disable the heartbeat feature of DM v1.0 to avoid the failure of high availability scheduling #1467
  • Fix the issue that the migration fails if the upstream binlog sequence number is larger than 999999 #1476
  • Fix the issue that DM commands hang when DM gets stuck in pinging the upstream and downstream databases #1477
  • Fix the issue that the full import fails when the upstream database enables the ANSI_QUOTES mode #1497
  • Fix the issue that DM might duplicate binlog events when the GTID and the relay log are enabled at the same time #1525

Known issues

GitHub issues

[2.0.1] 2020-12-25

Improvements

  • Support the relay log feature in high availability scenarios #1353
    • DM-worker supports storing relay logs only locally.
    • In scenarios where a DM-worker node is down or is offline due to network fluctuations, the newly scheduled DM-worker pulls the upstream binlog again.
  • Restrict the handle-error command to only handle DDL errors to avoid misuse #1303
  • Support simultaneously connecting multiple DM-master nodes and automatically switching connected nodes in dmctl #1349
  • Add the get-config command to get the configuration of migration tasks and DM components #1348
  • Support migrating SQL statements like ALTER TABLE ADD COLUMN (xx, xx) #1345
  • Support automatically filtering SQL statements like CREATE/ALTER/DROP EVENT #1343
  • Support checking whether server-id is set for the upstream MySQL/MariaDB instance before the incremental replication task starts #1315
  • Support replicating schemas and tables with sql in their names during the full import #1259

Bug fixes

  • Fix the issue that restarting a task might cause fail to initial unit Sync of subtask error #1274
  • Fix the issue that the pause-task command might be blocked when it is executed during the full import #1269 #1277
  • Fix the issue that DM fails to create a data source for a MariaDB instance when enable-gtid: true is configured #1344
  • Fix the issue that the query-status command might be blocked when it is executed #1293
  • Fix the issue that concurrently coordinating multiple DDL statements in the pessimistic shard DDL mode might block the task #1263
  • Fix the issue that running the pause-task command might get the meaningless sql: connection is already closed error #1304
  • Fix the issue that the full migration fails when the upstream instance does not have the REPLICATION privilege #1326
  • Fix the issue that the route-rules configuration of a shard merge task does not take effect in the full import when the SQL_MODE of the task contains ANSI_QUOTES #1314
  • Fix the issue that DM fails to automatically apply the SQL_MODE of the upstream database during the incremental replication #1307
  • Fix the issue that DM logs the fail to parse binlog status_vars warning when automatically parsing the SQL_MODE of the upstream database #1299

[2.0.0] 2020-10-30

Improvements

  • Optimize the setting of safe-mode to ensure the eventual consistency of data when the upstream database, such as Amazon Aurora and Aliyun RDS, does not support FTWRL in the full export #981 #1017
  • Support automatic configuration of sql_mode for data migration based on the global sql_mode of upstream and downstream databases and sql_mode of binlog events #1005 #1071 #1137
  • Support automatic configuration of the max_allowed_packet from DM to the downstream TiDB, based on the global max_allowed_packet value of the downstream TiDB #1071
  • Optimize the incremental replication speed compared with DM 2.0 RC version #1203
  • Improve performance by using optimistic transaction to migrate data to TiDB by default #1107
  • Support DM-worker automatically fetching and using the list of DM-master nodes in the cluster #1180
  • Disable auto-resume behavior for more errors that cannot be automatically recovered #979 #1085 #1216

Bug fixes

  • Fix the issue that failure to automatically set the default value of statement-size for full export might cause the packet for query is too large error or the OOM issue in TiDB #1133
  • Fix DM-worker panic when there are concurrent checkpoint operations during the full import #1182
  • Fix the issue that the migration task might have table checkpoint position * less than global checkpoint position error and be interrupted after the upstream MySQL/MariaDB instance is restarted #1041
  • Fix the issue that migration tasks might be interrupted when the upstream database does not enable GTID #1123
  • Fix the issue that the DM-master node does not start properly after conflicts occur during the shard DDL coordination #1199
  • Fix the issue that the incremental replication might be too slow when there are multiple common indexes in the table to be migrated #1063
  • Fix the issue that the progress display is abnormal after restarting the migration task during the full import #1043
  • Fix the issue that paused migration subtasks cannot be obtained by query-status after being scheduled to another DM-worker #1183
  • Fix the issue that FileSize might not take effect during the full export #1191
  • Fix the issue that the -s parameter in extra-args does not take effect during the full export #1196
  • Fix the issue that enabling the online DDL feature might cause not allowed operation: alter multiple tables in one statement error #1192
  • Fix the issue that during the incremental replication, the migration task might be interrupted when the DDL statements to be migrated are associated with other tables, such as DDL statements related to foreign keys #1101 #1108
  • Fix the issue that database names and table names with character / are not correctly parsed during the full migration #991
  • Fix the issue that after failing to migrate DDL statements to the downstream TiDB database during the incremental replication, migration tasks might not be paused and the corresponding error cannot be obtained from query-status #1059
  • Fix the issue that concurrently coordinating multiple DDL statements in the optimistic shard DDL mode might block the task #1051
  • Fix the issue that a DM-master might try to forward requests to other DM-master nodes after it becomes the leader #1157
  • Fix the issue that DM cannot parse GRANT CREATE TABLESPACE during the precheck #1113
  • Fix the issue that migration tasks are interrupted when migrating DROP TABLE statements but corresponding tables don’t exist #990
  • Fix the issue that operate-schema might not work properly when the --source parameter is specified #1106
  • Fix the issue that list-member cannot be executed correctly after enabling TLS #1050
  • Fix the issue that mixing https and http in the config items might cause the cluster to not work properly after enabling TLS #1220
  • Fix the issue that the HTTP API cannot work properly after configuring the cert-allowed-cn parameter for DM-masters #1036
  • Fix the issue that for incremental replication tasks, the configuration check fails when binlog-gtid is only specified in the meta of the task configuration #987
  • Fix the issue that in the interactive mode, dmctl cannot correctly execute some commands starting or ending with blank characters #1202
  • Fix the issue that the converting NULL to string is unsupported error is output to the log file during the full export #1014
  • Fix the issue that the progress might be displayed as NaN during the full import #1209

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

[2.0.0-rc.2] 2020-09-01

Improvements

  • Support more AWS Aurora-specific privileges when pre-checking the data migration task #950
  • Check whether GTID is enabled for the upstream MySQL/MariaDB when configuring enable-gtid: true and creating a data source #957

Bug fixes

  • Fix the Column count doesn't match value count error that occurs in the running migration task after automatically upgrading the DM cluster from v1.0.x to v2.0.0-rc #952
  • Fix the issue that the DM-worker or DM-master component might not correctly exit #963
  • Fix the issue that the --no-locks argument does not take effect on the dump processing unit in DM v2.0 #961
  • Fix the field remove-meta not found in type config.TaskConfig error that occurs when using the task configuration file of the v1.0.x cluster to start the task of a v2.0 cluster #965
  • Fix the issue that when the domain name is used as the connection address of each component, the component might not be correctly started #955
  • Fix the issue that the connection between the upstream and downstream might not be released after the migration task is stopped #943
  • Fix the issue that in the optimistic sharding DDL mode, concurrently executing the DDL statement on multiple sharded tables might block the sharding DDL coordination #944
  • Fix the issue that the newly started DM-master might cause the list-member to panic #970

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

[2.0.0-rc] 2020-08-21

Improvements

  • Support high availability for data migration tasks
  • Add an optimistic mode for sharding DDL statements
  • Add the handle-error command to handle errors during DDL incremental replication
  • Add a workaround field in the error returned by query-status to suggest the error handling method
  • Improve the monitoring dashboards and alert rules
  • Replace Mydumper with Dumpling as the full export unit
  • Support the GTID mode when performing incremental replication to the downstream
  • Support TLS connections between upstream and downstream databases, and between DM components
  • Support the incremental replication scenarios where the table of the downstream has more columns than that of the upstream
  • Add a --remove-meta option to the start-task command to clean up metadata related to data migration tasks
  • Support dropping columns with single-column indices
  • Support automatically cleaning up temporary files after a successful full import
  • Support checking whether the table to be migrated has a primary key or a unique key before starting a migration task
  • Support connectivity check between dmctl and DM-master while starting dmctl
  • Support connectivity check for downstream TiDB during the execution of start-task/check-task
  • Support replacing task names with task configuration files for some commands such as pause-task
  • Support logs in json format for DM-master and DM-worker components
  • Remove the call stack information and redundant fields in the error message returned by query-status
  • Improve the binlog position information of the upstream database returned by query-status
  • Improve the processing of auto resume when an error is encountered during the full export

Bug fixes

  • Fix the issue of goroutine leak after executing stop-task
  • Fix the issue that the task might not be paused after executing pause-task
  • Fix the issue that the checkpoint might not be saved correctly in the initial stage of incremental replication
  • Fix the issue that the BIT data type is incorrectly handled during incremental replication

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Support high availability for data migration tasks #473
  • Add an optimistic mode for sharding DDL statements #568
  • Add the handle-error command to handle errors during DDL incremental replication #850
  • Add a workaround field in the error returned by query-status to suggest the error handling method #753
  • Improve the monitoring dashboards and alert rules #853
  • Replace Mydumper with Dumpling as the full export unit #540
  • Support the GTID mode when performing incremental replication to the downstream #521
  • Support TLS connections between upstream and downstream databases, and between DM components #569
  • Support the incremental replication scenarios where the table of the downstream has more columns than that of the upstream #379
  • Add a --remove-meta option to the start-task command to clean up metadata related to data migration tasks #651
  • Support dropping columns with single-column indices #801
  • Support automatically cleaning up temporary files after a successful full import #770
  • Support checking whether the table to be migrated has a primary key or a unique key before starting a migration task #870
  • Support connectivity check between dmctl and DM-master while starting dmctl #786
  • Support connectivity check for downstream TiDB during the execution of start-task/check-task #769
  • Support replacing task names with task configuration files for some commands such as pause-task #854
  • Support logs in json format for DM-master and DM-worker components #808
  • Remove the call stack information in the error message returned by query-status #746
  • Remove the redundant fields in the error message returned by query-status #771
  • Improve the binlog position information of the upstream database returned by query-status #830
  • Improve the processing of auto resume when an error is encountered during the full export #872
  • Fix the issue of goroutine leak after executing stop-task #731
  • Fix the issue that the task might not be paused after executing pause-task #644
  • Fix the issue that the checkpoint might not be saved correctly in the initial stage of incremental replication #758
  • Fix the issue that the BIT data type is incorrectly handled during incremental replication #876

[1.0.6] 2020-06-17

Improvements

  • Support the original plaintext passwords for upstream and downstream databases
  • Support configuring session variables for DM’s connections to upstream and downstream databases
  • Remove the call stack information in some error messages returned by the query-status command when the data migration task encounters an exception
  • Filter out the items that pass the precheck from the message returned when the precheck of the data migration task fails

Bug fixes

  • Fix the issue that the data migration task is not automatically paused and the error cannot be identified by executing the query-status command if an error occurs when the load unit creates a table
  • Fix possible DM-worker panics when data migration tasks run simultaneously
  • Fix the issue that the existing data migration task cannot be automatically restarted when the DM-worker process is restarted if the enable-heartbeat parameter of the task is set to true
  • Fix the issue that the shard DDL conflict error may not be returned after the task is resumed
  • Fix the issue that the replicate lag information is displayed incorrectly for an initial period of time when the enable-heartbeat parameter of the data migration task is set to true
  • Fix the issue that replicate lag cannot be calculated using the heartbeat information when lower_case_table_names is set to 1 in the upstream database
  • Disable the meaningless auto-resume tasks triggered by the unsupported collation error during data migration

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Support the original plaintext passwords for upstream and downstream databases #676
  • Support configuring session variables for DM’s connections to upstream and downstream databases #692
  • Remove the call stack information in some error messages returned by the query-status command when the data migration task encounters an exception #733 #747
  • Filter out the items that pass the precheck from the message returned when the precheck of the data migration task fails #730
  • Fix the issue that the data migration task is not automatically paused and the error cannot be identified by executing the query-status command if an error occurs when the load unit creates a table #747
  • Fix possible DM-worker panics when data migration tasks run simultaneously #710
  • Fix the issue that the existing data migration task cannot be automatically restarted when the DM-worker process is restarted if the enable-heartbeat parameter of the task is set to true #739
  • Fix the issue that the shard DDL conflict error may not be returned after the task is resumed #739 #742
  • Fix the issue that the replicate lag information is displayed incorrectly for an initial period of time when the enable-heartbeat parameter of the data migration task is set to true #704
  • Fix the issue that replicate lag cannot be calculated using the heartbeat information when lower_case_table_names is set to 1 in the upstream database #704
  • Disable the meaningless auto-resume tasks triggered by the unsupported collation error during data migration #735
  • Optimize some logs #660 #724 #738

[1.0.5] 2020-04-27

Improvements

  • Improve the incremental replication speed when the UNIQUE KEY column has the NULL value
  • Add retry for the Write conflict (9007 and 8005) error returned by TiDB

Bug fixes

  • Fix the issue that the Duplicate entry error might occur during the full data import
  • Fix the issue that the replication task cannot be stopped or paused when the full data import is completed and the upstream has no written data
  • Fix the issue the monitoring metrics still display data after the replication task is stopped

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Improve the incremental replication speed when the UNIQUE KEY column has the NULL value #588 #597
  • Add retry for the Write conflict (9007 and 8005) error returned by TiDB #632
  • Fix the issue that the Duplicate entry error might occur during the full data import #554
  • Fix the issue that the replication task cannot be stopped or paused when the full data import is completed and the upstream has no written data #622
  • Fix the issue the monitoring metrics still display data after the replication task is stopped #616
  • Fix the issue that the Column count doesn't match value count error might be returned during the sharding DDL replication #624
  • Fix the issue that some metrics such as data file size are incorrectly displayed when the paused task of full data import is resumed #570
  • Add and fix multiple monitoring metrics #590 #594

[1.0.4] 2020-03-13

Improvements

  • Add English UI for DM-portal
  • Add the --more parameter in the query-status command to show complete replication status information

Bug fixes

  • Fix the issue that resume-task might fail to resume the replication task which is interrupted by the abnormal connection to the downstream TiDB server
  • Fix the issue that the online DDL operation cannot be properly replicated after a failed replication task is restarted because the online DDL meta information has been cleared after the DDL operation failure
  • Fix the issue that query-error might cause the DM-worker to panic after start-task goes into error
  • Fix the issue that the relay log file and relay.meta cannot be correctly recovered when restarting an abnormally stopped DM-worker process before relay.meta is successfully written

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Add English UI for DM-portal #480
  • Add the --more parameter in the query-status command to show complete replication status information #533
  • Fix the issue that resume-task might fail to resume the replication task which is interrupted by the abnormal connection to the downstream TiDB server #436
  • Fix the issue that the online DDL operation cannot be properly replicated after a failed replication task is restarted because the online DDL meta information is cleared after the DDL operation failure #465
  • Fix the issue that query-error might cause the DM-worker to panic after start-task goes into error #519
  • Fix the issue that the relay log file and relay.meta cannot be correctly recovered when restarting an abnormally stopped DM-worker process before relay.meta is successfully written #534
  • Fix the issue that the value out of range error might be reported when getting server-id from the upstream #538
  • Fix the issue that when Prometheus is not configured DM-Ansible prints the wrong error message that DM-master is not configured #438

[1.0.3] 2019-12-13

Improvements

  • Add the command mode in dmctl
  • Support replicating the ALTER DATABASE DDL statement
  • Optimize the error message output

Bug fixes

  • Fix the panic-causing data race issue occurred when the full import unit pauses or exits
  • Fix the issue that stop-task and pause-task might not take effect when retrying SQL operations to the downstream

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Add the command mode in dmctl #364
  • Optimize the error message output #351
  • Optimize the output of the query-status command #357
  • Optimize the privilege check for different task modes #374
  • Support checking the duplicate quotaed route-rules or filter-rules in task config#385
  • Support replicating the ALTER DATABASE DDL statement #389
  • Optimize the retry mechanism for anomalies #391
  • Fix the panic issue caused by the data race when the import unit pauses or exits #353
  • Fix the issue that stop-task and pause-task might not take effect when retrying SQL operations to the downstream #400
  • Upgrade golang to v1.13 and upgrade the version of other dependencies #362
  • Filter the error that the context is canceled when a SQL statement is being executed #382
  • Fix the issue that the error occurred when performing a rolling update to DM monitor using DM-ansible causes the update to fail #408

[1.0.2] 2019-10-30

Improvements

  • Generate some config items for DM-worker automatically
  • Generate some config items for replication task automatically
  • Simplify the output of query-status without arguments
  • Manage DB connections directly for downstream

Bug fixes

  • Fix some panic when starting up or executing SQL statements
  • Fix abnormal sharding DDL replication on DDL execution timeout
  • Fix starting task failure caused by the checking timeout or any inaccessible DM-worker
  • Fix SQL execution retry for some error

Action required

  • When upgrading from a previous version, note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Generate random server-id for DM-worker config automatically #337
  • Generate flavor for DM-worker config automatically #328
  • Generate relay-binlog-name and relay-binlog-gtid for DM-worker config automatically #318
  • Generate table name list for dumping in task config from black & white table lists automatically #326
  • Add concurrency items (mydumper-thread, loader-thread and syncer-thread) for task config #314
  • Simplify the output of query-status without arguments #340
  • Fix abnormal sharding DDL replication on DDL execution timeout #338
  • Fix potential DM-worker panic when restoring subtask from local meta #311
  • Fix DM-worker panic when committing a DML transaction failed #313
  • Fix DM-worker or DM-master panic when the listening port is being used #301
  • Fix retry for error code 1105 #321, #332
  • Fix retry for Duplicate entry and Data too long for column #313
  • Fix task check timeout when having large amounts of tables in upstream #327
  • Fix starting task failure when any DM-worker is not accessible #319
  • Fix potential DM-worker startup failure in GTID mode after being recovered from corrupt relay log #339
  • Fix in-memory TPS count for sync unit #294
  • Manage DB connections directly for downstream #325
  • Improve error system by refining error information passed between components #320

[1.0.1] 2019-09-10

Bug fixes

  • Fix a bug that may cause database connection re-establish too frequent #280
  • Fix a potential panic bug when we query-status during subtask unit transforming between different units #274

[1.0.0] 2019-09-06

v1.0.0 What's New

Improvements

  • Add auto recovery framework
  • Make task retryable when encounters a database driver error
  • Make task retryable when encounters network issue
  • Improve the DDL compatibility in DM

Bug fixes

  • Fix the bug that has a risk of data loss when the upstream database connection is abnormal

Action required

  • When upgrading from a previous version, please note that you must upgrade all DM components (dmctl/DM-master/DM-worker) together

Detailed Bug Fixes and Changes

  • Retry for upstream bad connection #265
  • Added some retryable errors in underlying database implementation #256
  • Added task auto recovery framework #246
  • Unify DB operation into one pkg for load and binlog replication #236
  • Fixed a bug in task handler that may cause dm-worker panic #225
  • Refactor DM error system #216
  • Add strictly config verification in dm-master, dm-worker and task #212
  • Limit DM error and log message length #257
  • Support case insensitive binlog event filter in binlog replication #188
  • Refactor DM log with pingcap/log #195
  • Use INSERT instead of REPLACE under non safe-mode #199

[1.0.0-rc.1] 2019-07-01

  • Remove the restriction of "the next shard DDL statement cannot be executed unless the current shard DDL operation is completely finished in shard merge scene for binlog replication" #177
  • Support retry task on the invalid connection error for binlog replication #66
  • Support generating -schema-create.sql files automatically for full migration #186
  • Use TiDB SQL Parser to parse and restore DDL statements in binlog query events, and remove the use db statement when replicating to downstream #54
  • Support migrating tables with generated column for full migration and binlog replication #42 #60
  • Support appending the task name as a suffix to the dumped data directory (dir in the task configuration file) for full migration #100
  • Support resuming tasks automatically after the DM-worker process restarted #88 #116
  • Support skipping pre-check items when starting tasks #65
  • Support case-insensitive in binlog event type of Binlog Event Filter rules #188
  • Optimize relay log mechanism to improve compatibility with upstream MySQL/MariaDB #92 #108 #117 #140 #171
  • Optimize RPC framework to limit the concurrency between DM-master and DM-worker #157
  • Redirect the log of mydumper into the log of DM-worker #93
  • Support using --print-sample-config command flag to show the sample config of DM-worker and DM-master #28
  • Support showing the status of sharding DDL replication in the Grafana dashboard and optimize the dashboard #96 #101 #120
  • Support setting the max_allowed_packet parameter for the database connection to the upstream and downstream #99
  • Support using unsafe_cleanup in DM Ansible to clean components of DM cluster #128
  • Fix flushing checkpoint wrongly when existing multiple sharding groups #124
  • Fix the wrong progress status when loading dumped files #89
  • Greatly improve the test to ensure correctness
  • Fix many other bugs that don't affect correctness

[1.0.0-alpha] 2019-01-18

  • Support the full data migration and the incremental data migration from MySQL/MariaDB into TiDB
  • Support running multi independent synchronization tasks concurrently on one DM-worker instance
  • Support synchronizing a certain table of the upstream MySQL/MariaDB instance to the specified table in TiDB by table routing
  • Support only synchronizing or filtering all operations of some databases or some tables by black and white lists
  • Support synchronizing or filtering some of the binlog events by binlog event filter
  • Support modifying auto-increment primary key fields to resolve the conflicts for shard tables by column mapping
  • Support merging the original shard instances and tables into TiDB but with some restrictions
  • Support synchronizing data definition changed by online DDL tools (including pt-osc and gh-ost)
  • Support handling synchronization trouble caused by DDL which is not supported by TiDB