[ZOOKEEPER-2330] ZooKeeper close API does not close Login thread.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.5.0
• Fix Version/s: 3.5.2, 3.6.0
• Component/s: java client
• Assignee: Mohammad Arshad
• Reporter: Mohammad Arshad
• Created: 23/Nov/15 10:03
• Updated: 21/Jul/16 20:18
• Resolved: 08/May/16 20:24

Description

When kerberos is used as authentication mechanism, one login thread runs in the background for ZooKeeper client as well ZooKeepr server.
This problem is related to Zookeeper client and the scenario is as follows:

1. Main application connects to Zookeeper

   ZooKeeper zooKeeper = new ZooKeeper(zookeeperConnectionString, sessionTimeout, this)
   

2. Completes it is work with zookeeper
3. calls close() on zookeeper, and continues with rest of the application specific work

Thread dump, taken after 3rd step, shows that login thread is still alive

"Thread-1" daemon prio=6 tid=0x04842c00 nid=0x1f04 waiting on condition [0x05b7f000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.zookeeper.Login$1.run(Login.java:180)
	at java.lang.Thread.run(Thread.java:722)

Issue Links

• breaks: ZOOKEEPER-2335 Java Compilation Error in ClientCnxn.java
• depends upon: ZOOKEEPER-2396 Login object in ZooKeeperSaslClient is static