说明
不知道是否对7.*所有版本有效 我目前是7.4 如果按照下面方法不行 最好是下载源码调试
源码获取参考 https://www.cnblogs.com/LQBlog/p/12177295.html#autoid-3-0-0
支持的同步
输入端
canal adapter个人理解是canal实现的 数据同步增量全量到ES和和各个数据库 暂时只支持以下几种可以看出接口打了SPI注解 如果我们输出到其他端可以扩展
输出端
如以下配置 我大概看了源码 tcp增量数据来源是binlog 也可以是kafka和rocketMQ
canal.conf:
mode: tcp # kafka rocketMQ 数据来源TCP则是binlog 其他则增量数据来源是kafka和rocketMQ
同步到ES7.*源码修改
因为各个ES版本客户端api都不一致，默认只支持到了6.4以下的版本，如果以上版本 则需要自行替换es客户端 然后某些不兼容的地方修改,这里我拿ES7.4做比较
/canal-canal-1.1.4/client-adapter/elasticsearch/pom.xml
1.修改POM文件 提高客户端版本
<!-- <dependency>--> <!-- <groupId>org.elasticsearch</groupId>--> <!-- <artifactId>elasticsearch</artifactId>--> <!-- <version>6.4.3</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>org.elasticsearch.client</groupId>--> <!-- <artifactId>transport</artifactId>--> <!-- <version>6.4.3</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>org.elasticsearch.client</groupId>--> <!-- <artifactId>elasticsearch-rest-client</artifactId>--> <!-- <version>6.4.3</version>--> <!-- </dependency>--> <!-- <dependency>--> <!-- <groupId>org.elasticsearch.client</groupId>--> <!-- <artifactId>elasticsearch-rest-high-level-client</artifactId>--> <!-- <version>6.4.3</version>--> <!-- </dependency>--> <!--liqiangtodo 版本提高改动--> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-high-level-client</artifactId> <version>7.4.0</version> </dependency> <dependency> <groupId>org.elasticsearch</groupId> <artifactId>elasticsearch</artifactId> <version>7.4.0</version> </dependency> <!--7.4.0没有对应版本的transport 所以我还是使用6.4.3--> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>transport</artifactId> <version>6.4.3</version> </dependency> <dependency>
2.放开mapping判断
com.alibaba.otter.canal.client.adapter.es.support.ESConnection#getMapping
public MappingMetaData getMapping(String index, String type) { MappingMetaData mappingMetaData = null; if (mode == ESClientMode.TRANSPORT) { ImmutableOpenMap<String, MappingMetaData> mappings; try { mappings = transportClient.admin() .cluster() .prepareState() .execute() .actionGet() .getState() .getMetaData() .getIndices() .get(index) .getMappings(); } catch (NullPointerException e) { throw new IllegalArgumentException("Not found the mapping info of index: " + index); } mappingMetaData = mappings.get(type); } else { ImmutableOpenMap<String, ImmutableOpenMap<String, MappingMetaData>> mappings; try { GetMappingsRequest request = new GetMappingsRequest(); request.indices(index); GetMappingsResponse response; // try { // response = restHighLevelClient // .indices() // .getMapping(request, RequestOptions.DEFAULT); // // 6.4以下版本直接使用该接口会报错 // } catch (Exception e) { // logger.warn("Low ElasticSearch version for getMapping"); response = RestHighLevelClientExt.getMapping(restHighLevelClient, request, RequestOptions.DEFAULT); // } mappings = response.mappings(); } catch (NullPointerException e) { throw new IllegalArgumentException("Not found the mapping info of index: " + index); } catch (IOException e) { logger.error(e.getMessage(), e); return null; } mappingMetaData = mappings.get(index).get(type); } return mappingMetaData; }
将红色部分改为
//liqiangtodo 版本提高改动 public MappingMetaData getMapping(String index, String type) { MappingMetaData mappingMetaData = null; if (mode == ESClientMode.TRANSPORT) { ImmutableOpenMap<String, MappingMetaData> mappings; try { mappings = transportClient.admin() .cluster() .prepareState() .execute() .actionGet() .getState() .getMetaData() .getIndices() .get(index) .getMappings(); } catch (NullPointerException e) { throw new IllegalArgumentException("Not found the mapping info of index: " + index); } mappingMetaData = mappings.get(type); } else { ImmutableOpenMap<String, ImmutableOpenMap<String, MappingMetaData>> mappings; try { GetMappingsRequest request = new GetMappingsRequest(); request.indices(index); GetMappingsResponse response; response = RestHighLevelClientExt.getMapping(restHighLevelClient, request, RequestOptions.DEFAULT); mappings = response.mappings(); } catch (NullPointerException e) { throw new IllegalArgumentException("Not found the mapping info of index: " + index); } catch (IOException e) { logger.error(e.getMessage(), e); return null; } // mappingMetaData = mappings.get(index).get(type); //liqiangtodo 版本提高改动 mappingMetaData = mappings.get(index).get("properties"); } return mappingMetaData; }
3.bulk版本兼容改动
com.alibaba.otter.canal.client.adapter.es.support.ESConnection.ESBulkRequest#bulk
红色部分是我的改动，刷新策略是 我需要理解可见 因为用户下单后 同步到es 需要马上在订单列表可见
ublic BulkResponse bulk() { BulkResponse bulkResponse=null; if (mode == ESClientMode.TRANSPORT) { bulkResponse=bulkRequestBuilder.execute().actionGet(); } else { try { //详见文档https://blog.csdn.net/hanchao5272/article/details/89151166 刷新策略 立即可见 bulkRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE); //liqiangtodo 版本提高修改 bulkResponse =restHighLevelClient.bulk(bulkRequest,RequestOptions.DEFAULT); // return restHighLevelClient.bulk(bulkRequest); } catch (IOException e) { throw new RuntimeException(e); } } return bulkResponse; }
4.getEsType
com.alibaba.otter.canal.client.adapter.es.support.ESTemplate#getEsType
**
* 获取es mapping中的属性类型
*
* @param mapping mapping配置
* @param fieldName 属性名
* @return 类型
*/
@SuppressWarnings("unchecked")
private String getEsType(ESMapping mapping, String fieldName) {
String key = mapping.get_index() + "-" + mapping.get_type();
Map<String, String> fieldType = esFieldTypes.get(key);
if (fieldType != null) {
return fieldType.get(fieldName);
} else {
MappingMetaData mappingMetaData = esConnection.getMapping(mapping.get_index(), mapping.get_type());
if (mappingMetaData == null) {
throw new IllegalArgumentException("Not found the mapping info of index: " + mapping.get_index());
}
fieldType = new LinkedHashMap<>();
//liqiangtodo 版本升级改动
Map<String, Object> esMapping =mappingMetaData.getSourceAsMap();
// Map<String, Object> sourceMap ==mappingMetaData.getSourceAsMap();
// Map<String, Object> esMapping = (Map<String, Object>) sourceMap.get("properties");
for (Map.Entry<String, Object> entry : esMapping.entrySet()) {
Map<String, Object> value = (Map<String, Object>) entry.getValue();
if (value.containsKey("properties")) {
fieldType.put(entry.getKey(), "object");
} else {
fieldType.put(entry.getKey(), (String) value.get("type"));
}
}
esFieldTypes.put(key, fieldType);
return fieldType.get(fieldName);
}
}
5.count
com.alibaba.otter.canal.client.adapter.es.ESAdapter#count
@Override public Map<String, Object> count(String task) { ESSyncConfig config = esSyncConfig.get(task); ESMapping mapping = config.getEsMapping(); SearchResponse response = this.esConnection.new ESSearchRequest(mapping.get_index(), mapping.get_type()).size(0) .getResponse(); //liqiangtodo 提高版本改动 //long rowCount = response.getHits().getTotalHits(); TotalHits totalHits= response.getHits().getTotalHits(); Map<String, Object> res = new LinkedHashMap<>(); res.put("esIndex", mapping.get_index()); res.put("count", totalHits.value); return res; }
6.修改es adapter的SPI的key
client-adapter/elasticsearch/src/main/resources/META-INF/canal/com.alibaba.otter.canal.client.adapter.OuterAdapter
#es=com.alibaba.otter.canal.client.adapter.es.ESAdapter
es7.4.0=com.alibaba.otter.canal.client.adapter.es.ESAdapter
消费不到binlog消息修改
com.alibaba.otter.canal.adapter.launcher.loader.CanalAdapterWorker#CanalAdapterWorker
public CanalAdapterWorker(CanalClientConfig canalClientConfig, String canalDestination, SocketAddress address, List<List<OuterAdapter>> canalOuterAdapters){ super(canalOuterAdapters); this.canalClientConfig = canalClientConfig; this.canalDestination = canalDestination; //liqiangtodo 消费不到改动 connector = CanalConnectors.newClusterConnector(Arrays.asList(address), canalDestination, "", ""); //connector = CanalConnectors.newSingleConnector(address, canalDestination, "", ""); }
订阅指定表配置
防止订阅到实例里面其他表变动
com.alibaba.otter.canal.client.adapter.support.CanalClientConfig 增加配置
//liqiangtodo canal订阅的消息 private String subscribe;
com.alibaba.otter.canal.adapter.launcher.loader.CanalAdapterWorker#process
...... //获取锁 com.alibaba.otter.canal.adapter.launcher.common.SyncSwitch.init 初始化位置 会读取zk /** * /canal-adapter/sync-switch/{canalDestination} on为可获取锁 off为阻塞 */ syncSwitch.get(canalDestination); logger.info("=============> Start to connect destination: {} <=============", this.canalDestination); connector.connect(); logger.info("=============> Start to subscribe destination: {} <=============", this.canalDestination); //liqiangtodo 消费不到改动 订阅自己关心的 if(StringUtils.isEmpty(canalClientConfig.getSubscribe())){ connector.subscribe("*.*"); }else { connector.subscribe(canalClientConfig.getSubscribe()); } //connector.subscribe(); logger.info("=============> Subscribe destination: {},subscribe:{} succeed <=============",this.canalDestination,StringUtils.isEmpty(canalClientConfig.getSubscribe())?"*.*":canalClientConfig.getSubscribe()); ......
使用方式
canal.conf:
subscribe: merge_test.pro_brand,merge_test.soa_ord_order_summary,merge_test.soa_ord_order,merge_test.soa_ord_order_item #我自己改源码加的防止订阅不关心的消息
基本类型空指针
如Interger 数据库存的是null
com.alibaba.otter.canal.client.adapter.es.support.ESSyncUtil#typeConvert
/** * 类型转换为Mapping中对应的类型 */ public static Object typeConvert(Object val, String esType) { if (val == null) { return null; } if (esType == null) { return val; } //liqiangtodo 增加代码 //For input string: ""防止空转换异常指针异常 if(StringUtil.isNullOrEmpty(val.toString())){ return null; } ...... }