[ 
https://issues.apache.org/jira/browse/KAFKA-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Boris Zhguchev updated KAFKA-7351:
----------------------------------
    Description: 
I think the method 

org.apache.kafka.clients.ClusterConnectionStates.isDisconnected

has wrong logic in proccesing wrong ids.
{code:java}
@Before
public void setup() {
    this.connectionStates = new ClusterConnectionStates(10_000, 60_000);
}

@Test
public void testIsDisconnected(){
    boolean connected = connectionStates.isConnected("fake_node");
    boolean disconnected = connectionStates.isDisconnected("fake_node");

    assertFalse(connected); // false
    assertFalse(disconnected); // false
}
{code}
It can be related with that that code block:
{code:java}
public boolean isDisconnected(String id) {
  NodeConnectionState state = nodeState.get(id);
// may be better is state == null ? true : state.isDisconnected()
  return state != null && state.state.isDisconnected(); 
}
{code}
[link|https://github.com/apache/kafka/blob/19b8ac55c389e4b2022476431a28c8431caed52a/clients/src/main/java/org/apache/kafka/clients/ClusterConnectionStates.java#L252]
 to github

  was:
I think the method ClusterConnectionStates.isDisconnected has wrong logic in 
proccesing wrong ids.
{code:java}
@Before
public void setup() {
    this.connectionStates = new ClusterConnectionStates(10_000, 60_000);
}

@Test
public void testIsDisconnected(){
    boolean connected = connectionStates.isConnected("fake_node");
    boolean disconnected = connectionStates.isDisconnected("fake_node");

    assertFalse(connected); // false
    assertFalse(disconnected); // false
}
{code}
It can be related with that that code block:
{code:java}
public boolean isDisconnected(String id) {
  NodeConnectionState state = nodeState.get(id);
// may be better is state == null ? true : state.isDisconnected()
  return state != null && state.state.isDisconnected(); 
}
{code}
[link|https://github.com/apache/kafka/blob/19b8ac55c389e4b2022476431a28c8431caed52a/clients/src/main/java/org/apache/kafka/clients/ClusterConnectionStates.java#L252]
 to github


> Wrong logic in method ClusterConnectionStates.isDisconnected
> ------------------------------------------------------------
>
>                 Key: KAFKA-7351
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7351
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 2.0.0
>            Reporter: Boris Zhguchev
>            Priority: Minor
>
> I think the method 
> org.apache.kafka.clients.ClusterConnectionStates.isDisconnected
> has wrong logic in proccesing wrong ids.
> {code:java}
> @Before
> public void setup() {
>     this.connectionStates = new ClusterConnectionStates(10_000, 60_000);
> }
> @Test
> public void testIsDisconnected(){
>     boolean connected = connectionStates.isConnected("fake_node");
>     boolean disconnected = connectionStates.isDisconnected("fake_node");
>     assertFalse(connected); // false
>     assertFalse(disconnected); // false
> }
> {code}
> It can be related with that that code block:
> {code:java}
> public boolean isDisconnected(String id) {
>   NodeConnectionState state = nodeState.get(id);
> // may be better is state == null ? true : state.isDisconnected()
>   return state != null && state.state.isDisconnected(); 
> }
> {code}
> [link|https://github.com/apache/kafka/blob/19b8ac55c389e4b2022476431a28c8431caed52a/clients/src/main/java/org/apache/kafka/clients/ClusterConnectionStates.java#L252]
>  to github



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