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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.search.preference;

import org.elasticsearch.action.admin.cluster.health.ClusterHealthStatus;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.test.ElasticsearchIntegrationTest;
import org.junit.Test;

import java.io.IOException;

import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_REPLICAS;
import static org.elasticsearch.common.settings.Settings.settingsBuilder;
import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.hamcrest.Matchers.*;

@ElasticsearchIntegrationTest.ClusterScope(minNumDataNodes = 2)
public class SearchPreferenceTests extends ElasticsearchIntegrationTest {

    @Test // see #2896
    public void testStopOneNodePreferenceWithRedState() throws InterruptedException, IOException {
        assertAcked(prepareCreate("test").setSettings(settingsBuilder().put("index.number_of_shards", cluster().numDataNodes()+2).put("index.number_of_replicas", 0)));
        ensureGreen();
        for (int i = 0; i < 10; i++) {
            client().prepareIndex("test", "type1", ""+i).setSource("field1", "value1").execute().actionGet();
        }
        refresh();
        internalCluster().stopRandomDataNode();
        client().admin().cluster().prepareHealth().setWaitForStatus(ClusterHealthStatus.RED).execute().actionGet();
        String[] preferences = new String[] {"_primary", "_local", "_primary_first", "_prefer_node:somenode", "_prefer_node:server2"};
        for (String pref : preferences) {
            SearchResponse searchResponse = client().prepareSearch().setSize(0).setPreference(pref).execute().actionGet();
            assertThat(RestStatus.OK, equalTo(searchResponse.status()));
            assertThat(pref, searchResponse.getFailedShards(), greaterThanOrEqualTo(0));
            searchResponse = client().prepareSearch().setPreference(pref).execute().actionGet();
            assertThat(RestStatus.OK, equalTo(searchResponse.status()));
            assertThat(pref, searchResponse.getFailedShards(), greaterThanOrEqualTo(0));
        }

        //_only_local is a stricter preference, we need to send the request to a data node
        SearchResponse searchResponse = dataNodeClient().prepareSearch().setSize(0).setPreference("_only_local").execute().actionGet();
        assertThat(RestStatus.OK, equalTo(searchResponse.status()));
        assertThat("_only_local", searchResponse.getFailedShards(), greaterThanOrEqualTo(0));
        searchResponse = dataNodeClient().prepareSearch().setPreference("_only_local").execute().actionGet();
        assertThat(RestStatus.OK, equalTo(searchResponse.status()));
        assertThat("_only_local", searchResponse.getFailedShards(), greaterThanOrEqualTo(0));
    }

    @Test
    public void noPreferenceRandom() throws Exception {
        assertAcked(prepareCreate("test").setSettings(
                //this test needs at least a replica to make sure two consecutive searches go to two different copies of the same data
                settingsBuilder().put(indexSettings()).put(SETTING_NUMBER_OF_REPLICAS, between(1, maximumNumberOfReplicas()))
        ));
        ensureGreen();
        
        client().prepareIndex("test", "type1").setSource("field1", "value1").execute().actionGet();
        refresh();

        final Client client = internalCluster().smartClient();
        SearchResponse searchResponse = client.prepareSearch("test").setQuery(matchAllQuery()).execute().actionGet();
        String firstNodeId = searchResponse.getHits().getAt(0).shard().nodeId();
        searchResponse = client.prepareSearch("test").setQuery(matchAllQuery()).execute().actionGet();
        String secondNodeId = searchResponse.getHits().getAt(0).shard().nodeId();

        assertThat(firstNodeId, not(equalTo(secondNodeId)));
    }

    @Test
    public void simplePreferenceTests() throws Exception {
        client().admin().indices().prepareCreate("test").setSettings("number_of_replicas=1").get();
        ensureGreen();

        client().prepareIndex("test", "type1").setSource("field1", "value1").execute().actionGet();
        refresh();

        SearchResponse searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_local").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_local").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));

        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_primary").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_primary").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));

        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));

        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica_first").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica_first").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));

        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("1234").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
        searchResponse = client().prepareSearch().setQuery(matchAllQuery()).setPreference("1234").execute().actionGet();
        assertThat(searchResponse.getHits().totalHits(), equalTo(1l));
    }

    @Test
    public void testReplicaPreference() throws Exception {
        client().admin().indices().prepareCreate("test").setSettings("number_of_replicas=0").get();
        ensureGreen();

        client().prepareIndex("test", "type1").setSource("field1", "value1").execute().actionGet();
        refresh();

        try {
            client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica").execute().actionGet();
            fail("should have failed because there are no replicas");
        } catch (Exception e) {
            // pass
        }

        SearchResponse resp = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica_first").execute().actionGet();
        assertThat(resp.getHits().totalHits(), equalTo(1l));

        client().admin().indices().prepareUpdateSettings("test").setSettings("number_of_replicas=1").get();
        ensureGreen("test");

        resp = client().prepareSearch().setQuery(matchAllQuery()).setPreference("_replica").execute().actionGet();
        assertThat(resp.getHits().totalHits(), equalTo(1l));
    }

    @Test (expected = IllegalArgumentException.class)
    public void testThatSpecifyingNonExistingNodesReturnsUsefulError() throws Exception {
        createIndex("test");
        ensureGreen();

        client().prepareSearch().setQuery(matchAllQuery()).setPreference("_only_node:DOES-NOT-EXIST").execute().actionGet();
    }
}

@@ -2481,24 +2481,88 @@
 ferences) %7B%0A
+            logger.info(%22--%3E Testing out preference=%7B%7D%22, pref);%0A
             

Add more logging to SearchPreferenceTests so that we can know which preference is failing.