Examples of LBHttpSolrServer

org.apache.solr.client.solrj.impl.LBHttpSolrServer
apache.org/solr/LBHttpSolrServer">wiki page.
It offers automatic failover when a server goes down and it detects when the server comes back up.
Load balancing is done using a simple roundrobin on the list of servers.
If a request to a server fails by an IOException due to a connection timeout or read timeout then the host is taken off the list of live servers and moved to a 'dead server list' and the request is resent to the next live server. This process is continued till it tries all the live servers. If atleast one server is alive, the request succeeds, andif not it fails.
```
 SolrServer lbHttpSolrServer = new LBHttpSolrServer("http://host1:8080/solr/","http://host2:8080/solr","http://host2:8080/solr"); //or if you wish to pass the HttpClient do as follows httpClient httpClient =  new HttpClient(); SolrServer lbHttpSolrServer = new LBHttpSolrServer(httpClient,"http://host1:8080/solr/","http://host2:8080/solr","http://host2:8080/solr"); 
```
This detects if a dead server comes alive automatically. The check is done in fixed intervals in a dedicated thread. This interval can be set using {@link #setAliveCheckInterval} , the default is set to one minute.
When to use this?
This can be used as a software load balancer when you do not wish to setup an external load balancer. The code is relatively new and the API is currently experimental. Alternatives to this code are to use a dedicated hardware load balancer or using Apache httpd with mod_proxy_balancer as a load balancer. See Load balancing on Wikipedia @since solr 1.4

Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

  public void testSimple() throws Exception {
    String[] s = new String[solr.length];
    for (int i = 0; i < solr.length; i++) {
      s[i] = solr[i].getUrl();
    }
    LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(httpClient, s);
    lbHttpSolrServer.setAliveCheckInterval(500);
    SolrQuery solrQuery = new SolrQuery("*:*");
    Set<String> names = new HashSet<String>();
    QueryResponse resp = null;
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(3, names.size());


    // Kill a server and test again
    solr[1].jetty.stop();
    solr[1].jetty = null;
    names.clear();
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(2, names.size());
    assertFalse(names.contains("solr1"));


    // Start the killed server once again
    solr[1].startJetty();
    // Wait for the alive check to complete
    Thread.sleep(1200);
    names.clear();
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(3, names.size());
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

    }
    assertEquals(3, names.size());
  }


  public void testTwoServers() throws Exception {
    LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(httpClient, solr[0].getUrl(), solr[1].getUrl());
    lbHttpSolrServer.setAliveCheckInterval(500);
    SolrQuery solrQuery = new SolrQuery("*:*");
    Set<String> names = new HashSet<String>();
    QueryResponse resp = null;
    solr[0].jetty.stop();
    solr[0].jetty = null;
    resp = lbHttpSolrServer.query(solrQuery);
    String name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr1", name);
    resp = lbHttpSolrServer.query(solrQuery);
    name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr1", name);
    solr[1].jetty.stop();
    solr[1].jetty = null;
    solr[0].startJetty();
    Thread.sleep(1200);
    try {
      resp = lbHttpSolrServer.query(solrQuery);
    } catch(SolrServerException e) {
      // try again after a pause in case the error is lack of time to start server
      Thread.sleep(3000);
      resp = lbHttpSolrServer.query(solrQuery);
    }
    name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr0", name);
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

    }
    HttpClient myHttpClient = new HttpClient(new MultiThreadedHttpConnectionManager());


    myHttpClient.getParams().setParameter("http.connection.timeout", new Integer(100));
    myHttpClient.getParams().setParameter("http.socket.timeout", new Integer(100));
    LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(myHttpClient, s);
    lbHttpSolrServer.setAliveCheckInterval(500);


    // Kill a server and test again
    solr[1].jetty.stop();
    solr[1].jetty = null;


    // query the servers
    for (String value : s)
      lbHttpSolrServer.query(new SolrQuery("*:*"));


    // Start the killed server once again
    solr[1].startJetty();
    // Wait for the alive check to complete
    waitForServer(30000, lbHttpSolrServer, 3, "solr1");

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

  public void testSimple() throws Exception {
    String[] s = new String[solr.length];
    for (int i = 0; i < solr.length; i++) {
      s[i] = solr[i].getUrl();
    }
    LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(httpClient, s);
    lbHttpSolrServer.setAliveCheckInterval(500);
    SolrQuery solrQuery = new SolrQuery("*:*");
    Set<String> names = new HashSet<String>();
    QueryResponse resp = null;
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(3, names.size());


    // Kill a server and test again
    solr[1].jetty.stop();
    solr[1].jetty = null;
    names.clear();
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(2, names.size());
    assertFalse(names.contains("solr1"));


    // Start the killed server once again
    solr[1].startJetty();
    // Wait for the alive check to complete
    Thread.sleep(1200);
    names.clear();
    for (String value : s) {
      resp = lbHttpSolrServer.query(solrQuery);
      assertEquals(10, resp.getResults().getNumFound());
      names.add(resp.getResults().get(0).getFieldValue("name").toString());
    }
    assertEquals(3, names.size());
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

    }
    assertEquals(3, names.size());
  }


  public void testTwoServers() throws Exception {
    LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(httpClient, solr[0].getUrl(), solr[1].getUrl());
    lbHttpSolrServer.setAliveCheckInterval(500);
    SolrQuery solrQuery = new SolrQuery("*:*");
    Set<String> names = new HashSet<String>();
    QueryResponse resp = null;
    solr[0].jetty.stop();
    solr[0].jetty = null;
    resp = lbHttpSolrServer.query(solrQuery);
    String name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr1", name);
    resp = lbHttpSolrServer.query(solrQuery);
    name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr1", name);
    solr[1].jetty.stop();
    solr[1].jetty = null;
    solr[0].startJetty();
    Thread.sleep(1200);
    try {
      resp = lbHttpSolrServer.query(solrQuery);
    } catch(SolrServerException e) {
      // try again after a pause in case the error is lack of time to start server
      Thread.sleep(3000);
      resp = lbHttpSolrServer.query(solrQuery);
    }
    name = resp.getResults().get(0).getFieldValue("name").toString();
    Assert.assertEquals("solr0", name);
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

      // LBHttpSolrServer - denoted by "loadbalance" in properties
    } else if (solrJServerType.toString().toLowerCase().equals("loadbalance")) {
      LOG.info("Using LBHttpSolrServer Solrj implementation.");
      String[] solrUrlElements = StringUtils.split(solrServerUrl);
      try {
        this.adminServer = new LBHttpSolrServer(solrUrlElements);
      } catch (MalformedURLException e) {
        e.printStackTrace();
      }
      try {
        this.server = new LBHttpSolrServer( solrUrlElements + "/" + mapping.getCoreName() );
      } catch (MalformedURLException e) {
        e.printStackTrace();
      }
    }
    if (autoCreateSchema) {

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

  private static LBHttpSolrServer cloneLBHttpSolrServer(SolrServer solrServer, String core) {
    if (solrServer == null) {
      return null;
    }


    LBHttpSolrServer clone = null;
    try {
      if (VersionUtil.isSolr3XAvailable()) {
        clone = cloneSolr3LBHttpServer(solrServer, core);
      } else if (VersionUtil.isSolr4XAvailable()) {
        clone = cloneSolr4LBHttpServer(solrServer, core);
      }
    } catch (Exception e) {
      throw new BeanInstantiationException(solrServer.getClass(), "Cannot create instace of " + solrServer.getClass()
          + ". ", e);
    }
    Object o = readField(solrServer, "interval");
    if (o != null) {
      clone.setAliveCheckInterval(Integer.valueOf(o.toString()).intValue());
    }
    return clone;
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer


    String[] servers = new String[list.size()];
    for (int i = 0; i < list.size(); i++) {
      servers[i] = appendCoreToBaseUrl(list.get(i).toString(), core);
    }
    return new LBHttpSolrServer(servers);
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer


    Boolean isInternalCient = readField(solrServer, "clientIsInternal");


    if (isInternalCient != null && !isInternalCient) {
      HttpClient clientToUse = readAndCloneHttpClient(solrServer);
      return new LBHttpSolrServer(clientToUse, servers);
    }
    return new LBHttpSolrServer(servers);
  }

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Examples of org.apache.solr.client.solrj.impl.LBHttpSolrServer

    this.setSolrServer(httpSolrServer);
  }


  private void createLoadBalancedHttpSolrServer() {
    try {
      LBHttpSolrServer lbHttpSolrServer = new LBHttpSolrServer(StringUtils.split(this.url, SERVER_URL_SEPARATOR));
      if (timeout != null) {
        lbHttpSolrServer.setConnectionTimeout(timeout.intValue());
      }
      this.setSolrServer(lbHttpSolrServer);
    } catch (MalformedURLException e) {
      throw new IllegalArgumentException("Unable to create Load Balanced Http Solr Server", e);
    }

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