---
Title: Write-behind configuration file
aliases: /integrate/redis-data-integration/write-behind/reference/config-yaml-reference/
alwaysopen: false
categories:
- docs
- integrate
- rs
- rdi
description: Write-behind configuration file reference
group: di
linkTitle: Write-behind configuration file
summary:
Redis Data Integration keeps Redis in sync with the primary database in near
real time.
type: integration
weight: 10
---
## Write-behind Configuration File
**Properties**
| Name | Type | Description | Required |
| ------------------------------------------------------------------------------------------ | ---------------- | ----------- | -------- |
| [**applier**](#applier)
(Configuration details of Write-behind Applier Gear) | `object`, `null` | | |
| [**connections**](#connections) | `object` | | |
### applier: Configuration details of Write-behind Applier Gear
**Properties**
| Name | Type | Description | Required |
| ------------------------------------------------------------------------------------------------------------------------------------ | ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- | ------------ | --- |
| **on_failed_retry_interval**
(Interval \(in seconds\) on which to perform retry on failure) | `integer`, `string` | Default: `5`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **read_batch_size**
(The batch size for reading data from source database) | `integer`, `string` | Default: `2000`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **debezium_lob_encoded_placeholder**
(Enable Debezium LOB placeholders) | `string` | Default: `"X19kZWJleml1bV91bmF2YWlsYWJsZV92YWx1ZQ=="`
| |
| **dedup**
(Enable deduplication mechanism) | `boolean` | Default: `false`
| |
| **dedup_max_size**
(Max size of the deduplication set) | `integer` | Default: `1024`
Minimum: `1`
| |
| **duration**
(Time \(in ms\) after which data will be read from stream even if read_batch_size was not reached) | `integer`, `string` | Default: `100`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **write_batch_size**
(The batch size for writing data to target Redis database\. Should be less or equal to the read_batch_size) | `integer`, `string` | Default: `200`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **error_handling**
(Error handling strategy: ignore \- skip, dlq \- store rejected messages in a dead letter queue) | `string` | Default: `"dlq"`
Pattern: ``^\${.\*}$ | ignore | dlq``
| |
| **dlq_max_messages**
(Dead letter queue max messages per stream) | `integer`, `string` | Default: `1000`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **target_data_type**
(Target data type: hash/json \- RedisJSON module must be in use in the target DB) | `string` | Default: `"hash"`
Pattern: ``^\${.\*}$ | hash | json``
| |
| **json_update_strategy**
(Target update strategy: replace/merge \- RedisJSON module must be in use in the target DB) | `string` | (DEPRECATED)
Property 'json_update_strategy' will be deprecated in future releases. Use 'on_update' job-level property to define the json update strategy.
Default: `"replace"`
Pattern: ``^\${.\*}$ | replace | merge``
| |
| **initial_sync_processes**
(Number of processes Write-behind Engine creates to process the initial sync with the source) | `integer`, `string` | Default: `4`
Pattern: `^\${.*}$`
Minimum: `1`
Maximum: `32`
| |
| **wait_enabled**
(Checks if the data has been written to the replica shard of the target database) | `boolean` | Default: `false`
| |
| **wait_timeout**
(Timeout in milliseconds when checking write to the replica shard of the target database) | `integer`, `string` | Default: `1000`
Pattern: `^\${.*}$`
Minimum: `1`
| |
| **retry_on_replica_failure**
(Ensures that the data has been written to the replica shard and keeps retrying if not) | `boolean` | Default: `true`
| |
**Additional Properties:** not allowed
### connections: Connections
**Properties (Pattern)**
| Name | Type | Description | Required |
| ------------------------ | ---- | ----------- | -------- |
| **\.\*** | | | |
| **additionalProperties** | | | |