TiDB Log Backup and PITR Command Manual
This document describes the commands used in TiDB log backup and point-in-time recovery (PITR).
For more information about log backup and PITR, refer to:
Perform log backup
You can start and manage log backup using the br log
command.
./br log --help
backup stream log from TiDB/TiKV cluster
Usage:
br log [command]
Available Commands:
metadata get the metadata of log dir
pause pause a log backup task
resume resume a log backup task
start start a log backup task
status get status for the log backup task
stop stop a log backup task
truncate truncate the log data until sometime
Each subcommand is described as follows:
br log start
: start a log backup task.br log status
: query the status of the log backup task.br log pause
: pause a log backup task.br log resume
: resume a paused log backup task.br log stop
: stop a log backup task and delete the task metadata.br log truncate
: clean up the log backup data from the backup storage.br log metadata
: query the metadata of the log backup data.
Start a backup task
You can run the br log start
command to start a log backup task. This task runs in the background of your TiDB cluster and automatically backs up the change log of KV storage to the backup storage.
Run br log start --help
to see the help information:
./br log start --help
start a log backup task
Usage:
br log start [flags]
Flags:
-h, --help help for start
--start-ts string usually equals last full backupTS, used for backup log. Default value is current ts. support TSO or datetime, e.g. '400036290571534337' or '2018-05-11 01:42:23+0800'.
--task-name string The task name for the backup log task.
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
-s, --storage string specify the url where backup storage, eg, "s3://bucket/path/prefix"
The example output only shows the common parameters. These parameters are described as follows:
--start-ts
: specifies the start timestamp for the log backup. If this parameter is not specified, the backup program uses the current time asstart-ts
.task-name
: specifies the task name for the log backup. This name is also used to query, pause, and resume the backup task.--ca
,--cert
,--key
: specifies the mTLS encryption method to communicate with TiKV and PD.--pd
: specifies the PD address for the backup cluster. BR needs to access PD to start the log backup task.--storage
: specifies the backup storage address. Currently, BR supports Amazon S3, Google Cloud Storage (GCS), or Azure Blob Storage as the storage for log backup. The preceding command uses Amazon S3 as an example. For details, see URL format of backup storages.
Usage example:
./br log start --task-name=pitr --pd="${PD_IP}:2379" \
--storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
Query the backup status
You can run the br log status
command to query the backup status.
Run br log status --help
to see the help information:
./br log status --help
get status for the log backup task
Usage:
br log status [flags]
Flags:
-h, --help help for status
--json Print JSON as the output.
--task-name string The task name for backup stream log. If default, get status of all of tasks (default "*")
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
In the example output, task-name
is used to specify the name of the backup task. The default value is *
, which means querying the status of all tasks.
Usage example:
./br log status --task-name=pitr --pd="${PD_IP}:2379"
Expected output:
● Total 1 Tasks.
> #1 <
name: pitr
status: ● NORMAL
start: 2022-07-14 20:08:03.268 +0800
end: 2090-11-18 22:07:45.624 +0800
storage: s3://backup-101/logbackup
speed(est.): 0.82 ops/s
checkpoint[global]: 2022-07-25 22:52:15.518 +0800; gap=2m52s
The output fields are described as follows:
status
: the status of the backup task, which can beNORMAL
,ERROR
, orPAUSE
.start
: the start time of the backup task. It is thestart-ts
value specified when the backup task is started.storage
: the backup storage address.speed
: the total QPS of the backup task. QPS means the number of logs backed per second.checkpoint [global]
: all data before this checkpoint is backed up to the backup storage. This is the latest timestamp available for restoring the backup data.error [store]
: the error the log backup program encounters on the storage node.
Pause and resume a backup task
You can run the br log pause
command to pause a running backup task.
Run br log pause --help
to see the help information:
./br log pause --help
pause a log backup task
Usage:
br log pause [flags]
Flags:
--gc-ttl int the TTL (in seconds) that PD holds for BR's GC safepoint (default 86400)
-h, --help help for status
--task-name string The task name for backup stream log.
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
Usage example:
./br log pause --task-name=pitr --pd="${PD_IP}:2379"
You can run the br log resume
command to resume a paused backup task.
Run br log resume --help
to see the help information:
./br log resume --help
resume a log backup task
Usage:
br log resume [flags]
Flags:
-h, --help help for status
--task-name string The task name for backup stream log.
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
After the backup task is paused for more than 24 hours, running br log resume
reports an error, and BR prompts that backup data is lost. To handle this error, refer to Backup & Restore FAQs.
Usage example:
./br log resume --task-name=pitr --pd="${PD_IP}:2379"
Stop and restart a backup task
You can stop a log backup task by running the br log stop
command and restart a backup task that is stopped by using the original --storage
directory.
Stop a backup task
You can run the br log stop
command to stop a log backup task. This command cleans up the task metadata in the backup cluster.
Run br log stop --help
to see the help information:
./br log stop --help
stop a log backup task
Usage:
br log stop [flags]
Flags:
-h, --help help for status
--task-name string The task name for the backup log task.
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
Usage example:
./br log stop --task-name=pitr --pd="${PD_IP}:2379"
Restart a backup task
After running the br log stop
command to stop a log backup task, you can create a new log backup task in another --storage
directory or restart the log backup task in the original --storage
directory by running the br log start
command. If you restart the task in the original --storage
directory, pay attention to the following points:
- Parameters of the
--storage
directory for restarting a task must be the same as the task that is stopped. - The
--start-ts
does not need to be specified. BR automatically starts the backup from the last backup checkpoint. - If the task is stopped for a long time and multiple versions of the data have been garbage collected, the error
BR:Backup:ErrBackupGCSafepointExceeded
is reported when you attempt to restart the task. In this case, you have to create a new log backup task in another--storage
directory.
Clean up backup data
You can run the br log truncate
command to clean up the outdated or no longer needed log backup data.
Run br log truncate --help
to see the help information:
./br log truncate --help
truncate the incremental log until sometime.
Usage:
br log truncate [flags]
Flags:
--dry-run Run the command but don't really delete the files.
-h, --help help for truncate
--until string Remove all backup data until this TS.(support TSO or datetime, e.g. '400036290571534337' or '2018-05-11 01:42:23+0800'.)
-y, --yes Skip all prompts and always execute the command.
Global Flags:
-s, --storage string specify the url where backup storage, eg, "s3://bucket/path/prefix"
This command only accesses the backup storage and does not access the TiDB cluster. Some parameters are described as follows:
--dry-run
: run the command but do not really delete the files.--until
: delete all log backup data before the specified timestamp.--storage
: the backup storage address. Currently, BR supports Amazon S3, GCS, or Azure Blob Storage as the storage for log backup. For details, see URL format of backup storages.
Usage example:
./br log truncate --until='2022-07-26 21:20:00+0800' \
–-storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
Expected output:
Reading Metadata... DONE; take = 277.911599ms
We are going to remove 9 files, until 2022-07-26 21:20:00.0000.
Sure? (y/N) y
Clearing data files... DONE; take = 43.504161ms, kv-count = 53, kv-size = 4573(4.573kB)
Removing metadata... DONE; take = 24.038962ms
View the backup metadata
You can run the br log metadata
command to view the backup metadata in the storage system, such as the earliest and latest timestamp that can be restored.
Run br log metadata --help
to see the help information:
./br log metadata --help
get the metadata of log backup storage
Usage:
br log metadata [flags]
Flags:
-h, --help help for metadata
Global Flags:
-s, --storage string specify the url where backup storage, eg, "s3://bucket/path/prefix"
This command only accesses the backup storage and does not access the TiDB cluster.
The --storage
parameter is used to specify the backup storage address. Currently, BR supports Amazon S3, GCS, or Azure Blob Storage as the storage for log backup. For details, see URL format of backup storages.
Usage example:
./br log metadata –-storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
Expected output:
[2022/07/25 23:02:57.236 +08:00] [INFO] [collector.go:69] ["log metadata"] [log-min-ts=434582449885806593] [log-min-date="2022-07-14 20:08:03.268 +0800"] [log-max-ts=434834300106964993] [log-max-date="2022-07-25 23:00:15.618 +0800"]
Restore to a specified point in time (PITR)
You can run the br restore point
command to perform a PITR on a new cluster or just restore the log backup data.
Run br restore point --help
to see the help information:
./br restore point --help
restore data from log until specify commit timestamp
Usage:
br restore point [flags]
Flags:
--full-backup-storage string specify the backup full storage. fill it if want restore full backup before restore log.
-h, --help help for point
--restored-ts string the point of restore, used for log restore. support TSO or datetime, e.g. '400036290571534337' or '2018-05-11 01:42:23+0800'
--start-ts string the start timestamp which log restore from. support TSO or datetime, e.g. '400036290571534337' or '2018-05-11 01:42:23+0800'
Global Flags:
--ca string CA certificate path for TLS connection
--cert string Certificate path for TLS connection
--key string Private key path for TLS connection
-u, --pd strings PD address (default [127.0.0.1:2379])
-s, --storage string specify the url where backup storage, eg, "s3://bucket/path/prefix"
The example output only shows the common parameters. These parameters are described as follows:
--full-backup-storage
: the storage address for the snapshot (full) backup. To use PITR, specify this parameter and choose the latest snapshot backup before the restore timestamp. To restore only log backup data, you can omit this parameter. Currently, BR supports Amazon S3, GCS, or Azure Blob Storage as the storage for log backup. For details, see URL format of backup storages.--restored-ts
: the timestamp that you want to restore data to. If this parameter is not specified, BR restores data to the latest timestamp available in the log backup, that is, the checkpoint of the backup data.--start-ts
: the start timestamp that you want to restore log backup data from. If you only need to restore log backup data, you must specify this parameter.--pd
: the PD address of the restore cluster.--ca
,--cert
,--key
: specify the mTLS encryption method to communicate with TiKV and PD.--storage
: the storage address for the log backup. Currently, BR supports Amazon S3, GCS, or Azure Blob Storage as the storage for log backup. For details, see URL format of backup storages.
Usage example:
./br restore point --pd="${PD_IP}:2379"
--storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
--full-backup-storage='s3://backup-101/snapshot-202205120000?access-key=${access-key}&secret-access-key=${secret-access-key}"'
Full Restore <--------------------------------------------------------------------------------------------------------------------------------------------------------> 100.00%
*** ***["Full Restore success summary"] ****** [total-take=3.112928252s] [restore-data-size(after-compressed)=5.056kB] [Size=5056] [BackupTS=434693927394607136] [total-kv=4] [total-kv-size=290B] [average-speed=93.16B/s]
Restore Meta Files <--------------------------------------------------------------------------------------------------------------------------------------------------> 100.00%
Restore KV Files <----------------------------------------------------------------------------------------------------------------------------------------------------> 100.00%
"restore log success summary"] [total-take=192.955533ms] [restore-from=434693681289625602] [restore-to=434693753549881345] [total-kv-count=33] [total-size=21551]