vmaster.cc created ZEPPELIN-5572:
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Summary: Deadlock found when send 'GET_NOTE' OP message
Key: ZEPPELIN-5572
URL: https://issues.apache.org/jira/browse/ZEPPELIN-5572
Project: Zeppelin
Issue Type: Bug
Components: zeppelin-server
Affects Versions: 0.9.0
Reporter: vmaster.cc
Attachments: 86f9e98eb38a88a9d3b2e19acf3b3d659c797a94-jstack.log,
image-2021-10-22-11-39-10-664.png
org.apache.zeppelin.socket.ConnectionManager#addNoteConnection deadlock at
'synchronized (noteSocketMap)'
Zeppelin occasionally fails to respond when click paragraph or refresh notebook
page, but other functions such as login and configuration are normal.
This phenomenon has appeared for the third time, and you must to restart it to
restore service.
Test it by remote debug and jstack log found that deadlock occur when
addNoteConnection method, see more jstack log in attachments please.
!image-2021-10-22-11-39-10-664.png|width=577,height=311!
Note: I used the remote debugging on this instance some time ago. I am not sure
weather it caused by one of the debugging connections disconnect then cause
incompletable request.
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