[ZOOKEEPER-1755] Concurrent operations of four letter 'dump' ephemeral command and killSession causing NPE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.5
• Fix Version/s: 3.4.6, 3.5.0
• Component/s: server
• Assignee: Rakesh Radhakrishnan
• Reporter: Rakesh Radhakrishnan
• Created: 07/Sep/13 18:12
• Updated: 13/Mar/14 18:17
• Resolved: 19/Feb/14 01:38

Description

Potential problem occurs, when executing four letter 'dump' command and at the meantime zkserver has triggered session closure and removing the related information from the DataTree.

Please see the exception:

java.lang.NullPointerException
	at org.apache.zookeeper.server.DataTree.dumpEphemerals(DataTree.java:1278)
	at org.apache.zookeeper.server.DataTreeTest$1.run(DataTreeTest.java:82)