本文介绍ES的数据迁移方案:
由于ES更新速度比较快,很大程度上, 我们需要更新版本、插件、甚至更新分词器, 单纯的upgrade很有可能不能满足业务需求, 更坏的情况下, 可能需要重建索引。本文从Java API 的角度来介绍ES的数据迁移(或数据重新索引)。基于以下逻辑实现,个人已测试过2亿数据的迁移,可以放心使用。
1. 获取clientl连接。本文选择transportClient。
public class ClientUtil { static Settings defaultSettings = ImmutableSettings.settingsBuilder().put("client.transport.sniff", false).put("client.transport.ping_timeout","10s").build(); //如果你的集群node数量是稳定的,那么最好关闭sniff。 同时, 将ping时间设置高于默认5s, 很大程序上可以解决No Node available exception. // 创建私有对象 private static TransportClient targetClient; private static TransportClient sourceClient; static { try { Class<?> clazz = Class.forName(TransportClient.class.getName()); Constructor<?> constructor = clazz.getDeclaredConstructor(Settings.class); constructor.setAccessible(true); Settings finalSettings = ImmutableSettings.settingsBuilder() .put(defaultSettings) .build(); targetClient = (TransportClient) constructor.newInstance(finalSettings); targetClient.addTransportAddress(new InetSocketTransportAddress("192.168.1.100", 9300)) .addTransportAddress(new InetSocketTransportAddress("192.168.1.101", 9300)); sourceClient = (TransportClient) constructor.newInstance(finalSettings); sourceClient.addTransportAddress(new InetSocketTransportAddress("192.168.1.110", 9300)) .addTransportAddress(new InetSocketTransportAddress("192.168.1.111", 9300)); } catch (Exception e) { e.printStackTrace(); } } // 取得源实例 public static synchronized Client getSourceTransportClient() { return sourceClient; } // 取得目标实例 public static synchronized Client getTargetTransportClient() { return targetClient; } }
以上代码用于获取源cluster和目标cluster的client.
2.迁移主方法:
private void doMigrate(Client sourceclient, Client targetclient, String sourceIndexName, String targetIndexName, String indexDocType, int pageSize) { int total = 0; SearchResponse searchResponse = sourceclient.prepareSearch(sourceIndexName).setSearchType(SearchType.SCAN) .setQuery(matchAllQuery()).setSize(pageSize).setScroll(TimeValue.timeValueSeconds(20)).execute() .actionGet(); //scroll 的time不能太大, 以免对集群造成负载 boolean exists = targetclient.admin().indices().prepareExists(targetIndexName).execute().actionGet().isExists(); if (!exists) targetclient .admin() .indices() .prepareCreate(targetIndexName) .setSettings( settingsBuilder().put("index.number_of_replicas", 0).put("index.refresh_interval", "-1")) .execute().actionGet(); //设置replica为0, 不refresh, 为了提高索引速度。 try { Thread.sleep(200); } catch (InterruptedException e) { e.printStackTrace(); } BulkProcessor bulkProcessor = BulkProcessor.builder(targetclient, new BulkProcessor.Listener() { @Override public void beforeBulk(long executionId, BulkRequest request) { } @Override public void afterBulk(long executionId, BulkRequest request, BulkResponse response) { if (response.hasFailures()) { throw new RuntimeException("BulkResponse show failures: " + response.buildFailureMessage()); } } @Override public void afterBulk(long executionId, BulkRequest request, Throwable failure) { throw new RuntimeException("Caught exception in bulk: " + request + ", failure: " + failure, failure); } }).setConcurrentRequests(10).build(); //设置线程数量, 大小可以根据自己机器调配。 while (true) { searchResponse = sourceclient.prepareSearchScroll(searchResponse.getScrollId()) .setScroll(TimeValue.timeValueSeconds(20)).execute().actionGet(); for (SearchHit hit : searchResponse.getHits()) { IndexRequestBuilder indexRequestBuilder = targetclient.prepareIndex(targetIndexName, indexDocType); indexRequestBuilder.setSource(hit.getSource()); indexRequestBuilder.setId(hit.getId()); indexRequestBuilder.setOpType(IndexRequest.OpType.INDEX); bulkProcessor.add(indexRequestBuilder.request()); total++; } System.out.println("Already migrated : " + total + " records!"); if (searchResponse.getHits().hits().length == 0) { break; } } try { Thread.sleep(10000);//Sleep 10s waiting the cluster. } catch (InterruptedException e) { e.printStackTrace(); } bulkProcessor.close(); targetclient .admin() .indices().prepareUpdateSettings(targetIndexName).setSettings( settingsBuilder().put("index.number_of_replicas", 1).put("index.refresh_interval", "1s")) .execute().actionGet(); }
3.测试:
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public static void main(String[] args) throws ElasticSearchException, IOException, InterruptedException { int pageSize = 40; //分页大小, 不能过大, 太大影响集群性能, 可能引起no node 异常。 Client sourceclient = ClientUtil.getSourceTransportClient(); Client targetclient = ClientUtil.getTargetTransportClient(); //调用doMigrate方法。 doMigrate(sourceclient, targetclient, "test", "testnew", "test", pageSize);}