## case study

It is a guide to replicate single mysql table to elasticsearch.

## configuration

```
<source>
  type mysql_replicator

  # Set connection settings for replicate source.
  host localhost
  username your_mysql_user
  password your_mysql_password
  database myweb

  # Set replicate query configuration.
  query SELECT id, text, updated_at from search_test;
  primary_key id # specify unique key (default: id)
  interval 10s  # execute query interval (default: 1m)

  # Enable detect deletion event not only insert/update events. (default: yes)
  # It is useful to use `enable_delete no` that keep following recently updated record with this query.
  # `SELECT * FROM search_test WHERE DATE_ADD(updated_at, INTERVAL 5 MINUTE) > NOW();`
  enable_delete yes

  # Format output tag for each events. Placeholders usage as described below.
  tag replicator.myweb.search_test.${event}.${primary_key}
  # ${event} : the variation of row event type by insert/update/delete.
  # ${primary_key} : the value of `replicator_manager.settings.primary_key` in manager table.
</source>

<match replicator.**>
  type mysql_replicator_elasticsearch

  # Set Elasticsearch connection.
  host localhost
  port 9200

  # Set Elasticsearch index, type, and unique id (primary_key) from tag.
  tag_format (?<core_name>[^\.]+)\.(?<event>[^\.]+)\.(?<primary_key>[^\.]+)$

  # Set frequency of sending bulk request to Elasticsearch node.
  flush_interval 5s

  # Set maximum retry interval (required fluentd >= 0.10.41)
  max_retry_wait 1800

  # Queued chunks are flushed at shutdown process.
  flush_at_shutdown yes
</match>
```