nijel created ZOOKEEPER-2251:
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Summary: Add Client side packet response timeout to avoid infinite
wait.
Key: ZOOKEEPER-2251
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2251
Project: ZooKeeper
Issue Type: Bug
Reporter: nijel
I came across one issue related to Client side packet response timeout In my
cluster many packet drops happened for some time.
One observation is the zookeeper client got hanged. As per the thread dump it
is waiting for the response/ACK for the operation performed (synchronous API
used here).
I am using
zookeeper.serverCnxnFactory=org.apache.zookeeper.server.NIOServerCnxnFactory
Since only few packets missed there is no DISCONNECTED event occurred.
Need add a "response time out" for the operations or packets.
*Comments from [~rakeshr]*
My observation about the problem:-
* Can use tools like 'Wireshark' to simulate the artificial packet loss.
* Assume there is only one packet in the 'outgoingQueue' and unfortunately the
server response packet lost. Now, client will enter into infinite waiting.
https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1515
* Probably we can discuss more about this problem and possible solutions(add
packet ACK timeout or another better approach) in the jira.
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