PostgreSQL 到 Elasticsearch

选择对端数据库：

Elasticsearch

数据链路

基本功能

功能	说明
Schema Migration	If the target index does not exist, BladePipe will create the index mapping in the target based on the source metadata and mapping rules.
Full Data Migration	Migrate data by sequentially scanning data in tables and writing it in batches to the target database.
Incremental Data Sync	Sync of common DML like INSERT, UPDATE, DELETE is supported. UPDATE and DELETE for tables without primary keys are not synced.
Data Verification and Correction	Verify all existing data. Optionally, you can correct the inconsistent data based on verification results. Scheduled DataTasks are supported. For more information, see Create Verification and Correction DataJob.
Subscription Modification	Add, delete, or modify the subscribed tables with support for historical data migration. For more information, see Modify Subscription.
Position Resetting	Reset positions by file position or timestamp. Allow re-consumption of incremental data logs in a past period or since a specific Binlog file and position.
Index Name Mapping	Support the mapping rules, namely, concatenation with underscores (dataJobName_DB_SCHEMA_table), keeping the name the same as that in Source, converting the text to lowercase, converting the text to uppercase, truncating the name by "_digit" suffix.
DDL Sync	PostgreSQL DDL sync is realized by triggers. The user should have the permissions on triggers and tables. For more information, see Permissions Required for PostgreSQL
Metadata Retrieval	Retrieve the target metadata with filtering conditions or target primary keys set from the source table.

高级功能

功能	说明
全量前清空目标数据	运行全量任务前清除老数据，包括重跑任务、定时全量迁移都会触发此能力
重建目标表	运行全量任务前重建目标表，包括重跑任务、定时全量迁移都会触发此能力
ES 时间写入格式	以该字段的第一个时间格式写入 Elasticsearch，如果未设置时间格式，则使用 yyyy-MM-dd'T'HH:mm:ss 格式
ES 时区设置	只有当时间格式的时区为 ZZZZZ 时，才会将页面设置的时区写入到 Elasticsearch
Optional Fields in Indexing	By default, all fields are indexed. Specific fields can be excluded from indexing.
Field-level Analyzers	Allow selecting analyzers for string fields that are indexed. Support STANDARD (default), SIMPLE, and other common analyzers, with the option to specify custom analyzers.
Setting Index _id Field	By default, the _id field is a concatenation of the source primary key values. It can be changed to other field values.
Scheduled Full Data Migration	For more information, see Create Scheduled Full Data DataJob.
Custom Code	For more information, see Custom Code Processing, Debug Custom Code and Logging in Custom Code.
Data Filtering Conditions	Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering.
Setting Target Primary Key	Change the primary key to another field to facilitate data aggregation and other operations.

使用示例

标题	详情
Elasticsearch 对端同步技术详解	文档：Elasticsearch 对端同步技术详解

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源端数据源

前置条件

条件	说明
账号权限	需要权限如下(以自建数据库为例): GRANT ALL PRIVILEGES ON DATABASE 同步库 TO 同步账号（或同步库 information_schema 中所有视图的 SELECT 权限和需要同步表、索引、约束的 SELECT 权限) ALTER USER 同步账号 REPLICATION
增量同步准备	准备动作按如下步骤进行: 修改 postgresql.conf, 设置 wal_level=logical 和 wal_log_hints = on 修改 pg_hba.conf, 设置 host replication 同步账号 CIDR网段 md5 , host 同步库 同步账号 CIDR网段 md5, host postgres 同步账号 CIDR网段 md5 重启 PostgreSQL
网络准备	迁移同步节点（sidecar）可连接 PostgreSQL 标准交互接口（如 5432）

任务参数

参数名称	说明
fullFetchSize	全量扫描数据设置的 fetch size
eventStoreSize	缓存解析完毕的增量事件缓存大小
ignoreGisSRID	解析 GIS 数据类型时是否忽略 SRID
defaultGisSRID	设置 GIS 数据类型的 SRID

Tips: 通用参数配置请参考 通用参数及功能

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目标端数据源

前置条件

条件	说明
账号权限	具备索引的 create, delete, create_index, delete_index, read, write 权限
网络准备	迁移同步节点（sidecar）可连接 Elasticsearch 节点

任务参数

参数名称	说明
maxBulkSizeMb	单表最大攒批容量，超过此容量则刷出数据到写入队列
totalDataInMemMb	攒批写入，内存中最大数据容量，超过此容量或超过 asyncFlushIntervalSec 则刷出数据到写入队列
asyncFlushIntervalSec	攒批写入，等待刷出的间隔时间，超过此时间或超过 totalDataInMemMb 则刷出数据到写入队列
realFlushPauseSec	使用 Bulk Write 刷出数据到 ElasticSearch 的等待时间，0 则不等待
pkSeparator	拼接 _id 的分隔符（字段数 > 1）
enableBulkSizeThreshold	启用批量写入模式（默认开启）

Tips: 通用参数配置请参考 通用参数及功能