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Posted to dev@tomcat.apache.org by bu...@apache.org on 2022/06/23 14:17:22 UTC
[Bug 66142] New: Encounter "ejectedExecutionException: Queue capacity is full" when #busy thread is less than minSpareThreads
https://bz.apache.org/bugzilla/show_bug.cgi?id=66142
Bug ID: 66142
Summary: Encounter "ejectedExecutionException: Queue capacity
is full" when #busy thread is less than
minSpareThreads
Product: Tomcat 8
Version: 8.5.76
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: eddie.wu@sap.com
Target Milestone: ----
Created attachment 38326
--> https://bz.apache.org/bugzilla/attachment.cgi?id=38326&action=edit
number of busy thread vs total threads.
The setup:
<Executor name="tomcatThreadPool" namePrefix="exec-" maxThreads="100"
minSpareThreads="50" maxQueueSize="50" />
Warning and call stack when issue happened:
WARN [NioEndpoint] [][]Executor rejected socket
[org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@1c14500a:org.apache.tomcat.util.net.NioChannel@6279c985:java.nio.channels.SocketChannel
[connected local=/xxx:xx remote=/xxx:xx]] for processing
java.util.concurrent.RejectedExecutionException: Queue capacity is full
at
org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1413)
at
org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1376)
at
org.apache.catalina.core.StandardThreadExecutor.execute(StandardThreadExecutor.java:174)
but according to Zabbix monitoring (refer to attached screenshot):
number of busy threads never exceeds 29.
suspect there is potential issue inside thread pool.
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[Bug 66142] Encounter "ejectedExecutionException: Queue capacity is full" when #busy thread is less than minSpareThreads
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=66142
Mark Thomas <ma...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Mark Thomas <ma...@apache.org> ---
Monitoring tools use polling. The maximum value observed is not necessarily the
actual maximum.
If a traffic spike occurs then it is perfectly possible for requests to be
rejected with a queue that small.
If there was an issue (i.e. a leak in the thread busy counter), I'd expect to
see the threads busy metric rising slower over time. That isn't happening.
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