3153768 - How to interpret blocked threads on HttpSessionMutexListener in SAP Commerce Cloud

Symptom

When facing performance problems and collecting thread dumps, many blocked threads are found waiting to acquire a lock on a org.springframework.web.util.HttpSessionMutexListener$Mutex object:

"hybrisHTTP12" #421 daemon prio=5 os_prio=31 cpu=70.00ms elapsed=452.69s allocated=3744K defined_classes=0 tid=0x00007fefcb4b1000 nid=0x40003 waiting for monitor entry [0x0000700023c12000]

java.lang.Thread.State: BLOCKED (on object monitor)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:782)

- waiting to lock <0x00000007d0acecb8> (a org.springframework.web.util.HttpSessionMutexListener$Mutex)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)

...

This can be observed on monitoring tools as well, such as Dynatrace for example:

Environment

Any version of SAP Commerce & SAP Commerce on the Public Cloud.

Product

SAP Commerce Cloud all versions

Keywords

hybris, stuck, runnable, hanging, blank page , KBA , CEC-SCC-CLA-ENV-EMG , Environment Management , CEC-COM-CPS-PRF , Performance , How To

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