[KAFKA-782] replicas not being displayed in TopicMetadataResponse when replica's Broker is shutdown

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Component/s: replication
• Labels: kafka-0.8 p2

Environment

$ uname -a
Linux vrd01.atlnp1 2.6.32-279.el6.x86_64 #1 SMP Fri Jun 22 12:19:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode)

Kafka 0.8.0 loaded from HEAD on 1/29/2013

• Assignee: Neha Narkhede
• Reporter: Chris Curtin
• Created: 04/Mar/13 17:58
• Updated: 01/May/13 14:26
• Resolved: 01/May/13 14:26

Description

Setup

• 4 nodes in the cluster
• topic has 10 partitions, numbered 0-9 in the output below
• configure the cluster so one of the nodes doesn't hold any leader copies of the partition. I did this by shutting down a node, waiting for reassignment of leaders and starting again

Output of the TopicMetadataResponse call:

Partition: 0:vrd01.atlnp1 R:[ vrd03.atlnp1 vrd04.atlnp1 vrd01.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]
Partition: 1:vrd01.atlnp1 R:[ vrd04.atlnp1 vrd01.atlnp1 vrd02.atlnp1] I:[ vrd01.atlnp1 vrd04.atlnp1 vrd02.atlnp1]
Partition: 2:vrd01.atlnp1 R:[ vrd01.atlnp1 vrd02.atlnp1 vrd03.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd02.atlnp1]
Partition: 3:vrd03.atlnp1 R:[ vrd02.atlnp1 vrd03.atlnp1 vrd04.atlnp1] I:[ vrd03.atlnp1 vrd04.atlnp1 vrd02.atlnp1]
Partition: 4:vrd01.atlnp1 R:[ vrd03.atlnp1 vrd01.atlnp1 vrd02.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd02.atlnp1]
Partition: 5:vrd03.atlnp1 R:[ vrd04.atlnp1 vrd02.atlnp1 vrd03.atlnp1] I:[ vrd03.atlnp1 vrd04.atlnp1 vrd02.atlnp1]
Partition: 6:vrd01.atlnp1 R:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]
Partition: 7:vrd01.atlnp1 R:[ vrd02.atlnp1 vrd04.atlnp1 vrd01.atlnp1] I:[ vrd01.atlnp1 vrd04.atlnp1 vrd02.atlnp1]
Partition: 8:vrd03.atlnp1 R:[ vrd03.atlnp1 vrd02.atlnp1 vrd04.atlnp1] I:[ vrd03.atlnp1 vrd04.atlnp1 vrd02.atlnp1]
Partition: 9:vrd01.atlnp1 R:[ vrd04.atlnp1 vrd03.atlnp1 vrd01.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]

Note that vrd02.atlnp1 does not contain any leader replicas.

Shutdown vrd02 normally. Run TopicMetadataResponse again:

Partition: 0:vrd01.atlnp1 R:[ vrd03.atlnp1 vrd04.atlnp1 vrd01.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]
Partition: 1:vrd01.atlnp1 R:[ ] I:[]
Partition: 2:vrd01.atlnp1 R:[ ] I:[]
Partition: 3:vrd03.atlnp1 R:[ ] I:[]
Partition: 4:vrd01.atlnp1 R:[ ] I:[]
Partition: 5:vrd03.atlnp1 R:[ ] I:[]
Partition: 6:vrd01.atlnp1 R:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]
Partition: 7:vrd01.atlnp1 R:[ ] I:[]
Partition: 8:vrd03.atlnp1 R:[ ] I:[]
Partition: 9:vrd01.atlnp1 R:[ vrd04.atlnp1 vrd03.atlnp1 vrd01.atlnp1] I:[ vrd01.atlnp1 vrd03.atlnp1 vrd04.atlnp1]

Note that the partitions where vrd02 was in the replica set no longer show any replicas.

Not clear if the list of replicas isn't being set correctly or the replicas aren't associated with the partition any longer.

Java code:

kafka.javaapi.consumer.SimpleConsumer consumer = new SimpleConsumer("vrd01.atlnp1",
9092,
100000,
64 * 1024, "test");

List<String> topics2 = new ArrayList<String>();
topics2.add("storm-anon");
TopicMetadataRequest req = new TopicMetadataRequest(topics2);
kafka.javaapi.TopicMetadataResponse resp = consumer.send(req);

List<kafka.javaapi.TopicMetadata> data3 = resp.topicsMetadata();

for (kafka.javaapi.TopicMetadata item : data3) {

for (kafka.javaapi.PartitionMetadata part: item.partitionsMetadata() ) {
String replicas = "";
String isr = "";

for (kafka.cluster.Broker replica: part.replicas() )

{ replicas += " " + replica.host(); }

for (kafka.cluster.Broker replica: part.isr() )

{ isr += " " + replica.host(); }

System.out.println( "Partition: " + part.partitionId() + ":" + part.leader().host() + " R:[ " + replicas + "] I:[" + isr + "]");
}
}