Configuration Instructions
This document provides the configurations that need to be adjusted or paid attention to when using CCR.
FE Configurationβ
Configured in fe.conf, for example, restore_reset_index_id = true.
| Name | Description | Default Value | Version |
|---|---|---|---|
restore_reset_index_id | If inverted index or bitmap index is used in the synchronized table, it should be set to false. | false | Starting from 2.1.8 and 3.0.4. |
ignore_backup_tmp_partitions | To avoid synchronization interruption caused by upstream creating tmp partition, it should be set to true. | false | Starting from 2.1.8 and 3.0.4. |
max_backup_restore_job_num_per_db | Limit on the number of backup/restore jobs per DB in memory, it is recommended to set it to 2. | 10 | All versions. |
label_num_threshold | Controls the number of TXN Labels to prevent transaction recovery from being too fast; too large may occupy more memory, too small may cause data duplication in exceptional situations, the default value is sufficient in most cases. | 2000 | Starting from 2.1. |
restore_job_compressed_serialization | It is recommended to configure as true when the number of tablets exceeds 100,000. Before downgrading, turn off the configuration and ensure FE completes a checkpoint. When upgrading from 2.1 to 3.0, at least upgrade to 3.0.3. | false | Starting from 2.1.8 and 3.0.3. |
backup_job_compressed_serialization | It is recommended to configure as true when the number of tablets exceeds 100,000. Before downgrading, turn off the configuration and ensure FE completes a checkpoint. When upgrading from 2.1 to 3.0, at least upgrade to 3.0.3. | false | Starting from 2.1.8 and 3.0.3. |
backup_job_default_timeout_ms | Timeout for backup/restore jobs, both source and target cluster FE need to be configured. | None | Set according to requirements |
enable_restore_snapshot_rpc_compression | Enable snapshot info compression to reduce RPC message size, it is recommended to set it to true. | true | Starting from 2.1.8 and 3.0.3. |
BEβ
Configured in be.conf, for example, thrift_max_message_size = 2000000000.
| Name | Description | Default Value | Version |
|---|---|---|---|
thrift_max_message_size | BE thrift server single RPC packet limit, it is recommended to set to 2000000000 when the number of tablets involved in CCR jobs is large. | 100MB | All versions |
be_thrift_max_pkg_bytes | BE Thrift RPC message package size limit. | 20MB | Specific to 2.0. |
max_download_speed_kbps | Download speed limit for each download worker in downstream BE, default is 50MB/s per thread. | 50MB/s | All versions |
download_worker_count | Number of threads for download jobs, set according to network card, disk, and load. | 1 | All versions |
Table Attributesβ
Set in Create Table or Alter Table.
| Name | Description | Default Value | Version |
|---|---|---|---|
binlog.max_bytes | Maximum memory usage for binlog, it is recommended to keep at least 4GB. | Unlimited | All versions |
binlog.ttl_seconds | Retention time for binlog. | Unlimited before 2.0.5, starting from 2.0.5 it is 1 day (86400) | All versions |
