https://bz.apache.org/bugzilla/show_bug.cgi?id=66329
Bug ID: 66329
Summary: The Tomcat connection processing thread may exit
abnormally
Product: Tomcat 8
Version: 8.5.31
Hardware: PC
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: zhanyu...@sequoiadb.com
Target Milestone: ----
Created attachment 38427
--> https://bz.apache.org/bugzilla/attachment.cgi?id=38427&action=edit
A large number of connections enter close_wait
In tomcat org.apache.tomcat.util.net.NioEndpoint$Poller processKey method of
class, when in the process of selling Throwable handling, use ExpectionUtils.
The handleThrowable method handles the exception, and the ExpectionUtils after
capturing the Throwable process the logic as follows: When the Throwable
implementation class is ThreadDeath or VirtualMachineError, the clientPoller
thread exits by throwing an exception
Our tomcat runs on linux and limits the maximum number of user threads. When
the number of threads reaches the upper limit, tomcat cannot create new
processing threads and throws OutOfMemoryError, which is a subclass of
VirtualMachineError. The clientPoller thread exits without closing connections
being processed. New requests come in and the Acceptor thread accepts requests.
In this case, a large number of connections are in the close_wait state without
clietPoller to process them
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