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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.discovery.zen;

import org.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.VersionUtils;

import java.util.stream.Collectors;

import static org.elasticsearch.test.VersionUtils.allVersions;
import static org.elasticsearch.test.VersionUtils.getPreviousVersion;
import static org.elasticsearch.test.VersionUtils.incompatibleFutureVersion;
import static org.elasticsearch.test.VersionUtils.maxCompatibleVersion;
import static org.elasticsearch.test.VersionUtils.randomCompatibleVersion;
import static org.elasticsearch.test.VersionUtils.randomVersion;
import static org.elasticsearch.test.VersionUtils.randomVersionBetween;

public class MembershipActionTests extends ESTestCase {

    public void testPreventJoinClusterWithNewerIndices() {
        Settings.builder().build();
        MetaData.Builder metaBuilder = MetaData.builder();
        IndexMetaData indexMetaData = IndexMetaData.builder("test")
            .settings(settings(Version.CURRENT))
            .numberOfShards(1)
            .numberOfReplicas(1).build();
        metaBuilder.put(indexMetaData, false);
        MetaData metaData = metaBuilder.build();
        MembershipAction.ensureIndexCompatibility(Version.CURRENT, metaData);

        expectThrows(IllegalStateException.class, () ->
        MembershipAction.ensureIndexCompatibility(VersionUtils.getPreviousVersion(Version.CURRENT),
            metaData));
    }

    public void testPreventJoinClusterWithUnsupportedIndices() {
        Settings.builder().build();
        MetaData.Builder metaBuilder = MetaData.builder();
        IndexMetaData indexMetaData = IndexMetaData.builder("test")
            .settings(settings(VersionUtils.getPreviousVersion(Version.CURRENT
                .minimumIndexCompatibilityVersion())))
            .numberOfShards(1)
            .numberOfReplicas(1).build();
        metaBuilder.put(indexMetaData, false);
        MetaData metaData = metaBuilder.build();
        expectThrows(IllegalStateException.class, () ->
            MembershipAction.ensureIndexCompatibility(Version.CURRENT,
                metaData));
    }

    public void testPreventJoinClusterWithUnsupportedNodeVersions() {
        DiscoveryNodes.Builder builder = DiscoveryNodes.builder();
        final Version version = randomVersion(random());
        builder.add(new DiscoveryNode(UUIDs.base64UUID(), buildNewFakeTransportAddress(), version));
        builder.add(new DiscoveryNode(UUIDs.base64UUID(), buildNewFakeTransportAddress(), randomCompatibleVersion(random(), version)));
        DiscoveryNodes nodes = builder.build();

        final Version maxNodeVersion = nodes.getMaxNodeVersion();
        final Version minNodeVersion = nodes.getMinNodeVersion();
        if (maxNodeVersion.onOrAfter(Version.V_7_0_0_alpha1)) {
            final Version tooLow = getPreviousVersion(maxNodeVersion.minimumCompatibilityVersion());
            expectThrows(IllegalStateException.class, () -> {
                if (randomBoolean()) {
                    MembershipAction.ensureNodesCompatibility(tooLow, nodes);
                } else {
                    MembershipAction.ensureNodesCompatibility(tooLow, minNodeVersion, maxNodeVersion);
                }
            });
        }

        if (minNodeVersion.before(Version.V_6_0_0)) {
            Version tooHigh = incompatibleFutureVersion(minNodeVersion);
            expectThrows(IllegalStateException.class, () -> {
                if (randomBoolean()) {
                    MembershipAction.ensureNodesCompatibility(tooHigh, nodes);
                } else {
                    MembershipAction.ensureNodesCompatibility(tooHigh, minNodeVersion, maxNodeVersion);
                }
            });
        }

        if (minNodeVersion.onOrAfter(Version.V_7_0_0_alpha1)) {
            Version oldMajor = randomFrom(allVersions().stream().filter(v -> v.major < 6).collect(Collectors.toList()));
            expectThrows(IllegalStateException.class, () -> MembershipAction.ensureMajorVersionBarrier(oldMajor, minNodeVersion));
        }

        final Version minGoodVersion = maxNodeVersion.major == minNodeVersion.major ?
            // we have to stick with the same major
            minNodeVersion :
            maxNodeVersion.minimumCompatibilityVersion();
        final Version justGood = randomVersionBetween(random(), minGoodVersion, maxCompatibleVersion(minNodeVersion));

        if (randomBoolean()) {
            MembershipAction.ensureNodesCompatibility(justGood, nodes);
        } else {
            MembershipAction.ensureNodesCompatibility(justGood, minNodeVersion, maxNodeVersion);
        }
    }

    public void testSuccess() {
        Settings.builder().build();
        MetaData.Builder metaBuilder = MetaData.builder();
        IndexMetaData indexMetaData = IndexMetaData.builder("test")
            .settings(settings(VersionUtils.randomVersionBetween(random(),
                Version.CURRENT.minimumIndexCompatibilityVersion(), Version.CURRENT)))
            .numberOfShards(1)
            .numberOfReplicas(1).build();
        metaBuilder.put(indexMetaData, false);
        indexMetaData = IndexMetaData.builder("test1")
            .settings(settings(VersionUtils.randomVersionBetween(random(),
                Version.CURRENT.minimumIndexCompatibilityVersion(), Version.CURRENT)))
            .numberOfShards(1)
            .numberOfReplicas(1).build();
        metaBuilder.put(indexMetaData, false);
        MetaData metaData = metaBuilder.build();
            MembershipAction.ensureIndexCompatibility(Version.CURRENT,
                metaData);
    }
}

@@ -4948,95 +4948,52 @@
 r = 
-randomFrom(allVersions().stream().filter(v -%3E v.major %3C 6).collect(Collectors.toList())
+Version.V_6_4_0.minimumCompatibilityVersion(
 );%0A 

Fix sporadic failure in MembershipActionTests