package com.linkedin.helix.integration;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.zookeeper.data.Stat;
import org.testng.Assert;
import org.testng.annotations.Test;
import com.linkedin.helix.PropertyKey.Builder;
import com.linkedin.helix.TestHelper;
import com.linkedin.helix.ZNRecord;
import com.linkedin.helix.controller.HelixControllerMain;
import com.linkedin.helix.manager.zk.ZkBaseDataAccessor;
import com.linkedin.helix.mock.storage.MockParticipant;
import com.linkedin.helix.tools.ClusterStateVerifier;
import com.linkedin.helix.tools.ClusterStateVerifier.BestPossAndExtViewZkVerifier;
import com.linkedin.helix.tools.ClusterStateVerifier.MasterNbInExtViewVerifier;
public class TestExternalViewUpdates extends ZkIntegrationTestBase
{
@Test
public void testExternalViewUpdates() throws Exception
{
System.out.println("START testExternalViewUpdates at "
+ new Date(System.currentTimeMillis()));
String clusterName = getShortClassName();
MockParticipant[] participants = new MockParticipant[5];
int resourceNb = 10;
TestHelper.setupCluster(clusterName, ZK_ADDR, 12918, // participant port
"localhost", // participant name prefix
"TestDB", // resource name prefix
resourceNb, // resources
1, // partitions per resource
5, // number of nodes
1, // replicas
"MasterSlave",
true); // do rebalance
TestHelper.startController(clusterName,
"controller_0",
ZK_ADDR,
HelixControllerMain.STANDALONE);
// start participants
for (int i = 0; i < 5; i++)
{
String instanceName = "localhost_" + (12918 + i);
participants[i] = new MockParticipant(clusterName, instanceName, ZK_ADDR, null);
participants[i].syncStart();
}
boolean result =
ClusterStateVerifier.verifyByZkCallback(new MasterNbInExtViewVerifier(ZK_ADDR,
clusterName));
Assert.assertTrue(result);
result =
ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(ZK_ADDR,
clusterName));
Assert.assertTrue(result);
// need to verify that each ExternalView's version number is 2
Builder keyBuilder = new Builder(clusterName);
ZkBaseDataAccessor<ZNRecord> accessor = new ZkBaseDataAccessor<ZNRecord>(_gZkClient);
String parentPath = keyBuilder.externalViews().getPath();
List<String> childNames = accessor.getChildNames(parentPath, 0);
List<String> paths = new ArrayList<String>();
for (String name : childNames)
{
paths.add(parentPath + "/" + name);
}
// Stat[] stats = accessor.getStats(paths);
for (String path : paths)
{
Stat stat = accessor.getStat(path, 0);
Assert.assertTrue(stat.getVersion() <= 2, "ExternalView should be updated at most 2 times");
}
// TODO: need stop controller and participants
System.out.println("END testExternalViewUpdates at "
+ new Date(System.currentTimeMillis()));
}
}