[ZOOKEEPER-2188] client connection hung up because of dead loop

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.5.0
• Component/s: java client
• Assignee: Unassigned
• Reporter: sunhaitao
• Created: 11/May/15 11:07
• Updated: 24/Sep/24 03:20
• Resolved: 24/Sep/24 03:17

Description

There is something wrong with the client code ClientCnxn.java, it will keep trying to connect to server in a dead loop.
This is my test step, shut down zookeeper cluster, exectue zkCli.sh script to connect to zookeeper cluster, it will keep trying to connect to zookeeper server without stop.

public void run() {
clientCnxnSocket.introduce(this, sessionId, outgoingQueue);
clientCnxnSocket.updateNow();
clientCnxnSocket.updateLastSendAndHeard();
int to;
long lastPingRwServer = Time.currentElapsedTime();
final int MAX_SEND_PING_INTERVAL = 10000; //10 seconds
while (state.isAlive()) {
try {
if (!clientCnxnSocket.isConnected()) {
// don't re-establish connection if we are closing
if (closing)

{ break; }

startConnect();
clientCnxnSocket.updateLastSendAndHeard();
}

public boolean isAlive()

{ return this != CLOSED && this != AUTH_FAILED; }

because at the beginning it is CONNECTING so isAlive always returns true, which leads to dead loop.
we should add some retry limit to stop this

Issue Links

• is superceded by: ZOOKEEPER-4508 ZooKeeper client run to endless loop in ClientCnxn.SendThread.run if all server down