java 如何使用 SolrJ 获取 solr 服务器中所有内核的列表
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How can I get a list of all the cores in a solr server using SolrJ
提问by benhsu
We are using Solr for our searches, and sharding the data across several cores. We have one core per week of data, so we are dynamically creating and deleting cores each week.
我们使用 Solr 进行搜索，并将数据分片到多个核心。我们每周有一个核心数据，因此我们每周动态地创建和删除核心。
How can I query a solr server for a list of all its cores? The JavaDoc says I can use coreAdminHandler.getCoreContainer().getCoreNames(), but I'm not sure how to build a coreAdminHandler object.
如何查询 solr 服务器以获取其所有核心的列表？JavaDoc 说我可以使用coreAdminHandler.getCoreContainer().getCoreNames()，但我不确定如何构建 coreAdminHandler 对象。
回答by Mauricio Scheffer
A request to http://localhost:8983/solr/admin/cores?action=STATUS(replace your own host/port of course) will return all cores.
请求http://localhost:8983/solr/admin/cores?action=STATUS（当然是替换您自己的主机/端口）将返回所有内核。
回答by Matthieu Napoli
Using SolrJas you asked, here is how I did:
按照您的要求使用SolrJ，这是我的做法：
// Solr server instance
CommonsHttpSolrServer solrServer = ...;
// Request core list
CoreAdminRequest request = new CoreAdminRequest();
request.setAction(CoreAdminAction.STATUS);
CoreAdminResponse cores = request.process(solrServer);
// List of the cores
List<String> coreList = new ArrayList<String>();
for (int i = 0; i < cores.getCoreStatus().size(); i++) {
coreList.add(cores.getCoreStatus().getName(i));
}
回答by Lefty G Balogh
Just adding an update to the code sample above as several bits have been deprecated since Solr 4. The following code works on Solr 6.1.0.
只是向上面的代码示例添加更新，因为自 Solr 4 以来已经弃用了几个位。以下代码适用于 Solr 6.1.0。
package <...>.<...>.<...>;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.request.CoreAdminRequest;
import org.apache.solr.client.solrj.response.CoreAdminResponse;
import org.apache.solr.common.params.CoreAdminParams.CoreAdminAction;
public class GetCores {
static String SOLR_URL = "http://...:8983/solr/";
public static void getCores() {
System.out.println("Building Solr server instance");
HttpSolrClient solrClient=new HttpSolrClient.Builder(SOLR_URL).build();
System.out.println("Requesting core list");
CoreAdminRequest request = new CoreAdminRequest();
request.setAction(CoreAdminAction.STATUS);
CoreAdminResponse cores=null;
try {
cores = request.process(solrClient);
} catch (SolrServerException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(" Listing cores");
List<String> coreList = new ArrayList<String>();
for (int i = 0; i < cores.getCoreStatus().size(); i++) {
coreList.add(cores.getCoreStatus().getName(i));
}
System.out.println(coreList.get(0)+" is the first core");
}
}
