Harel Ben Attia created ZEPPELIN-4133:
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Summary: Idle sessions are no longer being closed even though
TimeoutLifecycleManagement is configured properly
Key: ZEPPELIN-4133
URL: https://issues.apache.org/jira/browse/ZEPPELIN-4133
Project: Zeppelin
Issue Type: Bug
Components: zeppelin-zengine
Affects Versions: 0.8.0
Reporter: Harel Ben Attia
Sometimes the timer thread which is initialized by the TimeoutLifecycleManager
crashes. This leads to zeppelin not clearing any timedout sessions until a
server restart is performed.
The underlying mechanism uses a java Timer (inside
TimeoutLifecycleManager.java). We are not sure what had caused the TimerThread
thread to crash, since it swallows exceptions/errors. However, a jstack
comparison between the server and another zeppelin server which was working
well had shown that there is a missing TimerThread thread in the problematic
server (1 TimerThread thread vs. 2 TimerThreads). After restarting the zeppelin
server, jstack started showing 2 TimerThread threads in its output.
Running on jdk 1.8.0_151, ubuntu 14.04, EC2.
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