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From jun...@apache.org
Subject [1/2] kafka-1390; TestUtils.waitUntilLeaderIsElectedOrChanged may wait longer than it needs; patched by Jun Rao; reviewed by Guozhang Wang
Date Tue, 15 Apr 2014 20:47:00 GMT
Repository: kafka
Updated Branches:
  refs/heads/trunk 4bd33e5ba -> 9a6f7113e


http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/server/LogOffsetTest.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/server/LogOffsetTest.scala b/core/src/test/scala/unit/kafka/server/LogOffsetTest.scala
index 521d156..76ae659 100644
--- a/core/src/test/scala/unit/kafka/server/LogOffsetTest.scala
+++ b/core/src/test/scala/unit/kafka/server/LogOffsetTest.scala
@@ -124,7 +124,7 @@ class LogOffsetTest extends JUnit3Suite with ZooKeeperTestHarness {
 
     // setup brokers in zookeeper as owners of partitions for this test
     AdminUtils.createTopic(zkClient, topic, 1, 1)
-    TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0, 500)
+    TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0)
 
     var offsetChanged = false
     for(i <- 1 to 14) {

http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/server/LogRecoveryTest.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/server/LogRecoveryTest.scala b/core/src/test/scala/unit/kafka/server/LogRecoveryTest.scala
index 4bf0ef6..ddb2402 100644
--- a/core/src/test/scala/unit/kafka/server/LogRecoveryTest.scala
+++ b/core/src/test/scala/unit/kafka/server/LogRecoveryTest.scala
@@ -75,7 +75,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topic, Map(0->Seq(0,1)))
 
     // wait until leader is elected
-    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500)
+    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId)
     assertTrue("Leader should get elected", leader.isDefined)
     // NOTE: this is to avoid transient test failures
     assertTrue("Leader could be broker 0 or broker 1", (leader.getOrElse(-1) == 0) || (leader.getOrElse(-1)
== 1))
@@ -108,7 +108,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topic, Map(0->Seq(0,1)))
 
     // wait until leader is elected
-    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500)
+    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId)
     assertTrue("Leader should get elected", leader.isDefined)
     // NOTE: this is to avoid transient test failures
     assertTrue("Leader could be broker 0 or broker 1", (leader.getOrElse(-1) == 0) || (leader.getOrElse(-1)
== 1))
@@ -124,13 +124,13 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness
{
     assertEquals(hw, hwFile1.read.getOrElse(TopicAndPartition(topic, 0), 0L))
 
     // check if leader moves to the other server
-    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500, leader)
+    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, oldLeaderOpt
= leader)
     assertEquals("Leader must move to broker 1", 1, leader.getOrElse(-1))
 
     // bring the preferred replica back
     server1.startup()
 
-    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500)
+    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId)
     assertTrue("Leader must remain on broker 1, in case of zookeeper session expiration it
can move to broker 0",
       leader.isDefined && (leader.get == 0 || leader.get == 1))
 
@@ -140,7 +140,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
     assertEquals(hw, hwFile2.read.getOrElse(TopicAndPartition(topic, 0), 0L))
 
     server2.startup()
-    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500, leader)
+    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, oldLeaderOpt
= leader)
     assertTrue("Leader must remain on broker 0, in case of zookeeper session expiration it
can move to broker 1",
       leader.isDefined && (leader.get == 0 || leader.get == 1))
 
@@ -172,7 +172,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topic, Map(0->Seq(0,1)))
 
     // wait until leader is elected
-    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500)
+    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId)
     assertTrue("Leader should get elected", leader.isDefined)
     // NOTE: this is to avoid transient test failures
     assertTrue("Leader could be broker 0 or broker 1", (leader.getOrElse(-1) == 0) || (leader.getOrElse(-1)
== 1))
@@ -205,7 +205,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topic, Map(0->Seq(server1.config.brokerId,
server2.config.brokerId)))
 
     // wait until leader is elected
-    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500)
+    var leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId)
     assertTrue("Leader should get elected", leader.isDefined)
     // NOTE: this is to avoid transient test failures
     assertTrue("Leader could be broker 0 or broker 1", (leader.getOrElse(-1) == 0) || (leader.getOrElse(-1)
== 1))
@@ -224,7 +224,7 @@ class LogRecoveryTest extends JUnit3Suite with ZooKeeperTestHarness {
 
     server2.startup()
     // check if leader moves to the other server
-    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, 500, leader)
+    leader = waitUntilLeaderIsElectedOrChanged(zkClient, topic, partitionId, oldLeaderOpt
= leader)
     assertEquals("Leader must move to broker 1", 1, leader.getOrElse(-1))
 
     assertEquals(hw, hwFile1.read.getOrElse(TopicAndPartition(topic, 0), 0L))

http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/server/OffsetCommitTest.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/server/OffsetCommitTest.scala b/core/src/test/scala/unit/kafka/server/OffsetCommitTest.scala
index ae9bb3a..90c21c6 100644
--- a/core/src/test/scala/unit/kafka/server/OffsetCommitTest.scala
+++ b/core/src/test/scala/unit/kafka/server/OffsetCommitTest.scala
@@ -79,7 +79,7 @@ class OffsetCommitTest extends JUnit3Suite with ZooKeeperTestHarness {
     val expectedReplicaAssignment = Map(0  -> List(1))
     // create the topic
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topic, expectedReplicaAssignment)
-    val leaderIdOpt = TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0, 1000)
+    val leaderIdOpt = TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0)
     assertTrue("Leader should be elected after topic creation", leaderIdOpt.isDefined)
     val commitRequest = OffsetCommitRequest("test-group", immutable.Map(topicAndPartition
-> OffsetAndMetadata(offset=42L)))
     val commitResponse = simpleConsumer.commitOffsets(commitRequest)
@@ -169,7 +169,7 @@ class OffsetCommitTest extends JUnit3Suite with ZooKeeperTestHarness {
     val topicAndPartition = TopicAndPartition("large-metadata", 0)
     val expectedReplicaAssignment = Map(0  -> List(1))
     AdminUtils.createOrUpdateTopicPartitionAssignmentPathInZK(zkClient, topicAndPartition.topic,
expectedReplicaAssignment)
-    var leaderIdOpt = TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topicAndPartition.topic,
0, 1000)
+    var leaderIdOpt = TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topicAndPartition.topic,
0)
     assertTrue("Leader should be elected after topic creation", leaderIdOpt.isDefined)
 
     val commitRequest = OffsetCommitRequest("test-group", immutable.Map(topicAndPartition
-> OffsetAndMetadata(

http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/server/ReplicaFetchTest.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/server/ReplicaFetchTest.scala b/core/src/test/scala/unit/kafka/server/ReplicaFetchTest.scala
index dd85c71..5305167 100644
--- a/core/src/test/scala/unit/kafka/server/ReplicaFetchTest.scala
+++ b/core/src/test/scala/unit/kafka/server/ReplicaFetchTest.scala
@@ -52,7 +52,7 @@ class ReplicaFetchTest extends JUnit3Suite with ZooKeeperTestHarness  {
     // create a topic and partition and await leadership
     for (topic <- List(topic1,topic2)) {
       AdminUtils.createTopic(zkClient, topic, 1, 2)
-      TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0, 1000)
+      TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, 0)
     }
 
     // send test messages to leader

http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/server/ServerShutdownTest.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/server/ServerShutdownTest.scala b/core/src/test/scala/unit/kafka/server/ServerShutdownTest.scala
index c7e058f..1651822 100644
--- a/core/src/test/scala/unit/kafka/server/ServerShutdownTest.scala
+++ b/core/src/test/scala/unit/kafka/server/ServerShutdownTest.scala
@@ -99,6 +99,7 @@ class ServerShutdownTest extends JUnit3Suite with ZooKeeperTestHarness {
     verifyNonDaemonThreadsStatus
   }
 
+  /* Temporarily disable the test until delete topic is fixed.
   @Test
   def testCleanShutdownWithDeleteTopicEnabled() {
     val newProps = TestUtils.createBrokerConfig(0, port)
@@ -111,6 +112,7 @@ class ServerShutdownTest extends JUnit3Suite with ZooKeeperTestHarness
{
     Utils.rm(server.config.logDirs)
     verifyNonDaemonThreadsStatus
   }
+  */
 
   def verifyNonDaemonThreadsStatus() {
     assertEquals(0, Thread.getAllStackTraces.keySet().toArray

http://git-wip-us.apache.org/repos/asf/kafka/blob/9a6f7113/core/src/test/scala/unit/kafka/utils/TestUtils.scala
----------------------------------------------------------------------
diff --git a/core/src/test/scala/unit/kafka/utils/TestUtils.scala b/core/src/test/scala/unit/kafka/utils/TestUtils.scala
index 53d01aa..e31fb90 100644
--- a/core/src/test/scala/unit/kafka/utils/TestUtils.scala
+++ b/core/src/test/scala/unit/kafka/utils/TestUtils.scala
@@ -149,7 +149,7 @@ object TestUtils extends Logging {
     // wait until the update metadata request for new topic reaches all servers
     (0 until numPartitions).map { case i =>
       TestUtils.waitUntilMetadataIsPropagated(servers, topic, i, 500)
-      i -> TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, i, 500)
+      i -> TestUtils.waitUntilLeaderIsElectedOrChanged(zkClient, topic, i)
     }.toMap
   }
 
@@ -436,34 +436,49 @@ object TestUtils extends Logging {
     }
   }
 
-  def waitUntilLeaderIsElectedOrChanged(zkClient: ZkClient, topic: String, partition: Int,
timeoutMs: Long, oldLeaderOpt: Option[Int] = None): Option[Int] = {
-    val leaderLock = new ReentrantLock()
-    val leaderExistsOrChanged = leaderLock.newCondition()
+  /**
+   *  If neither oldLeaderOpt nor newLeaderOpt is defined, wait until the leader of a partition
is elected.
+   *  If oldLeaderOpt is defined, it waits until the new leader is different from the old
leader.
+   *  If newLeaderOpt is defined, it waits until the new leader becomes the expected new
leader.
+   * @return The new leader or assertion failure if timeout is reached.
+   */
+  def waitUntilLeaderIsElectedOrChanged(zkClient: ZkClient, topic: String, partition: Int,
timeoutMs: Long = 5000L,
+                                        oldLeaderOpt: Option[Int] = None, newLeaderOpt: Option[Int]
= None): Option[Int] = {
+    require(!(oldLeaderOpt.isDefined && newLeaderOpt.isDefined), "Can't define both
the old and the new leader")
+    val startTime = System.currentTimeMillis()
+    var isLeaderElectedOrChanged = false;
 
-    if(oldLeaderOpt == None)
-      info("Waiting for leader to be elected for partition [%s,%d]".format(topic, partition))
-    else
-      info("Waiting for leader for partition [%s,%d] to be changed from old leader %d".format(topic,
partition, oldLeaderOpt.get))
+    trace("Waiting for leader to be elected or changed for partition [%s,%d], older leader
is %s, new leader is %s"
+          .format(topic, partition, oldLeaderOpt, newLeaderOpt))
 
-    leaderLock.lock()
-    try {
-      zkClient.subscribeDataChanges(ZkUtils.getTopicPartitionLeaderAndIsrPath(topic, partition),
new LeaderExistsOrChangedListener(topic, partition, leaderLock, leaderExistsOrChanged, oldLeaderOpt,
zkClient))
-      leaderExistsOrChanged.await(timeoutMs, TimeUnit.MILLISECONDS)
+    var leader: Option[Int] = None
+    while (!isLeaderElectedOrChanged && System.currentTimeMillis() < startTime
+ timeoutMs) {
       // check if leader is elected
-      val leader = ZkUtils.getLeaderForPartition(zkClient, topic, partition)
+      leader = ZkUtils.getLeaderForPartition(zkClient, topic, partition)
       leader match {
         case Some(l) =>
-          if(oldLeaderOpt == None)
-            info("Leader %d is elected for partition [%s,%d]".format(l, topic, partition))
-          else
-            info("Leader for partition [%s,%d] is changed from %d to %d".format(topic, partition,
oldLeaderOpt.get, l))
-        case None => error("Timing out after %d ms since leader is not elected for partition
[%s,%d]"
-                                   .format(timeoutMs, topic, partition))
+          if (newLeaderOpt.isDefined && newLeaderOpt.get == l) {
+            trace("Expected new leader %d is elected for partition [%s,%d]".format(l, topic,
partition))
+            isLeaderElectedOrChanged = true
+          } else if (oldLeaderOpt.isDefined && oldLeaderOpt.get != l) {
+            trace("Leader for partition [%s,%d] is changed from %d to %d".format(topic, partition,
oldLeaderOpt.get, l))
+            isLeaderElectedOrChanged = true
+          } else if (!oldLeaderOpt.isDefined) {
+            trace("Leader %d is elected for partition [%s,%d]".format(l, topic, partition))
+            isLeaderElectedOrChanged = true
+          } else {
+            trace("Current leader for partition [%s,%d] is %d".format(topic, partition, l))
+          }
+        case None =>
+          trace("Leader for partition [%s,%d] is not elected yet".format(topic, partition))
       }
-      leader
-    } finally {
-      leaderLock.unlock()
+      Thread.sleep(timeoutMs.min(100L))
     }
+    if (!isLeaderElectedOrChanged)
+      fail("Timing out after %d ms since leader is not elected or changed for partition [%s,%d]"
+           .format(timeoutMs, topic, partition))
+
+    return leader
   }
   
   /**


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