Work Manager in weblogic server allows the application to optimize (or) control the execution of its work based on the requirement. Using Work Manager we can setup a dedicated thread pool via the constraints and dictate on how the application requests needs to executed.
Weblogic release 8 and before used different pre-configured Execute Queues like weblogic.kernel.default(Default Queue),weblogic.admin.HTTP/RMI(protocol based) to perform different kinds of work.The later releases of weblogic started using a single self-tuning threading model which is used to execute all kinds of work. Weblogic server will automatically prioritise the work based on the configurations and also the runtime metrics.
The user can create additional Work Manager specific for their applications and provide constraints to dictate how its work needs to be prioritised. By default the total shared capacity for all Work Managers for a server is '65536' requests and they can be configured.
Some of the more common scenarios for using Work Managers are to handle the following :
- Throttling the number of requests to applications to avoid overloading them.Most of the legacy applications cannot handle huge overload and care should be taken to load the application with only the number of requests that it can handle.
- Throttle the number of requests to low-priority applications(Notification Service, Logging Service, etc.) to avoid over-servicing them.These applications can be throttled to avoid overloading of servers during the peak time so that critical services can be provided with more resources
A work manager consists of the following components:
- Request classes - They provide a scheduling guideline on how the threads needs to allocated to the application. By defining the request classes, we can dictate that high-priority applications needs to be serviced before the low-priority ones.
- Fair-Share - Specifies relative thread usage share required to process requests. Default value is 50
- Response-Time - The thread usage share required to process requests is determined by the reponse-time goal provided.
- Context - Assigns request classes to requests based on context information, such as the current user or the current user's group.
- Constraints - Dictates the minimum, maximum & total capacity threads allocated for a Work Manager to execute its requests.
- Minimum Threads Constraint - The guaranteed number of threads allocated for the work manager.
- Maximum Threads Constraint - The maximum number of threads that can be allocated for the work manager.
- Capacity Constraint - Total capacity of requests that can be executed & queued for servicing. Any requests over the capacity will be rejected.
In SOA 12c, the invoke/engine & system threads have been replaced through 'Work Manager Groups'. Each Partition will now need to be associated with a Work Manager Group and it dictates how invoke/engine & system threads are allocated to it. The below figure shows the work manager allocation for the 'default' partition. I will write a detailed article about this feature at a later date.
In this article I will show how to automate creation of Work Managers with constraints through WLST. Lets reuse the previous the library(WlstObject) that we created in our previous article.
The below figure shows that a new package 'wm' has been created and it contains the module 'workManagerObject.py'
The below script will allow creation of multiple Work Managers at the same time by providing the required constraints(Request Classes still needs to be implemented). The script is idempotent in the sense, if the Work Manager & the constraints are already available, then it will just update it otherwise will create it.
###################################################
# Name - workManageObject.py #
# Author - gkrishna #
# Version - 1.0 #
###################################################
import sys
from java.io import FileInputStream
from java.util import Properties
from weblogic.descriptor import BeanAlreadyExistsException
import wlstModule
import os
print os.path.abspath("../../../")
sys.path.append(os.path.abspath("../../../"))
from base import WlstObject
class WorkManagerObject(WlstObject):
_workManagerProperties = Properties()
_workManagers=None
###################################################
# Method -__init__ #
# __init__ method for WorkManagerObject #
# class #
###################################################
def __init__(self,commonPropertiesFile,workManagerPropertiesFile):
try:
super(WorkManagerObject,self).__init__(commonPropertiesFile)
self.defaultMBeanHierarchy='/SelfTuning/'+str(self.commonProperties.get("wls.domain.name"))
self.print_message('__init__ method in WorkManagerObject invoked - Reading property file '+workManagerPropertiesFile+' for Work Manager configurations.')
propertyInputStream = FileInputStream(workManagerPropertiesFile)
self._workManagerProperties.load(propertyInputStream)
self.connect()
self.action()
self.exit()
except:
self.print_message("Error executing __init__ method - " +str(sys.exc_info()[0]) +" "+ str(sys.exc_info()[1]))
###################################################
# Method - action #
# Overriden method to configure the Work #
# Manager. #
###################################################
def action(self):
try:
workManagers=self._workManagerProperties.get("WorkManagers")
if(workManagers==''):
raise 'No WorkManagers available in the properties file to configure.'
else:
for workManager in workManagers.split():
self.name=self._workManagerProperties.get(workManager+('.name'))
self.targets=self._workManagerProperties.get(workManager+('.targets'))
self.targetType=self._workManagerProperties.get(workManager+('.targetType'))
ignoreStuckThread=self._workManagerProperties.get(workManager+('.ignoreStuckThread'))
if(self.targets=='' or self.targetType==''):
raise 'Invalid Target configuration provided for the work manager - '+workManager
self.start_edit()
########## Minimum Thread Constraints ##########
minThreadsConstraintName=self._workManagerProperties.get(workManager+('.minThreadsConstraint.name'))
minThreadsConstraintCount=self._workManagerProperties.get(workManager+('.minThreadsConstraint.count'))
if(minThreadsConstraintName!='' and minThreadsConstraintCount!=''):
self.print_message('Creating MinThreadConstraint '+str(minThreadsConstraintName) + ' with count '+str(minThreadsConstraintCount))
minThreadsConstraint=MinThreadsContraint(minThreadsConstraintName,minThreadsConstraintCount,self.targetType,self.targets,self.defaultMBeanHierarchy)
minThreadsConstraint.action()
minThreadsConstraintExists=True
########## Maximum Thread Constraints ##########
maxThreadsConstraintName=self._workManagerProperties.get(workManager+('.minThreadsConstraint.name'))
maxThreadsConstraintCount=self._workManagerProperties.get(workManager+('.minThreadsConstraint.count'))
if(maxThreadsConstraintName!='' and maxThreadsConstraintCount!=''):
self.print_message('Creating MaxThreadConstraint '+maxThreadsConstraintName + ' with count '+maxThreadsConstraintCount)
maxThreadsConstraint=MaxThreadsContraint(maxThreadsConstraintName,maxThreadsConstraintCount,self.targetType,self.targets,self.defaultMBeanHierarchy)
maxThreadsConstraint.action()
maxThreadsConstraintExists=True
########## Capacity Constraints ##########
capacityConstraintName=self._workManagerProperties.get(workManager+('.capacityConstraint.name'))
capacityConstraintCount=self._workManagerProperties.get(workManager+('.capacityConstraint.count'))
if(capacityConstraintName!='' and capacityConstraintCount!=''):
self.print_message('Creating CapacityConstraint '+capacityConstraintName + ' with count '+capacityConstraintCount)
capacityConstraint=CapacityConstraint(capacityConstraintName,capacityConstraintCount,self.targetType,self.targets,self.defaultMBeanHierarchy)
capacityConstraint.action()
capacityConstraintExists=True
########## Work Manager ##########
wlstModule.cd(self.defaultMBeanHierarchy)
self.print_message('Creating WorkManager '+self.name)
wlstModule.cd(self.defaultMBeanHierarchy)
try:
wlstModule.cmo.createWorkManager(self.name)
except BeanAlreadyExistsException:
self.print_message(" Work Manager "+self.name+" already exists")
pass
wlstModule.cd(self.defaultMBeanHierarchy+'/WorkManagers/'+self.name)
self.set_targets()
if(minThreadsConstraintExists):
wlstModule.cmo.setMinThreadsConstraint(wlstModule.getMBean(self.defaultMBeanHierarchy+'/MinThreadsConstraints/'+minThreadsConstraintName))
if(maxThreadsConstraintExists):
wlstModule.cmo.setMaxThreadsConstraint(wlstModule.getMBean(self.defaultMBeanHierarchy+'/MaxThreadsConstraints/'+maxThreadsConstraintName))
if(capacityConstraintExists):
wlstModule.cmo.setCapacity(wlstModule.getMBean(self.defaultMBeanHierarchy+'/Capacities/'+capacityConstraintName))
if(ignoreStuckThread!=''):
wlstModule.cmo.setIgnoreStuckThreads(bool(ignoreStuckThread))
self.save_and_activate()
except:
self.print_message("Error executing create_workmanager method - " +str(sys.exc_info()[0]) +" "+ str(sys.exc_info()[1]))
self.cancel_and_exit()
class MinThreadsContraint(WlstObject):
_count=None
###################################################
# Method -__init__ #
# __init__ method for MinThreadsContraint #
# class #
###################################################
def __init__(self,name,count,targetType,targets,defaultMBeanHierarchy):
self.name=name
self._count=count
self.targetType=targetType
self.targets=targets
self.defaultMBeanHierarchy=defaultMBeanHierarchy
###################################################
# Method - action #
# Overriden method to configure #
# MinThreadsContraint for the Work #
# Manager #
###################################################
def action(self):
wlstModule.cd(self.defaultMBeanHierarchy)
try:
wlstModule.cmo.createMinThreadsConstraint(self.name)
except BeanAlreadyExistsException:
self.print_message(" MinThreadsConstraints "+self.name+" already exists")
pass
wlstModule.cd(self.defaultMBeanHierarchy+'/MinThreadsConstraints/'+self.name)
wlstModule.cmo.setCount(int(self._count))
self.set_targets()
class MaxThreadsContraint(WlstObject):
_count=None
###################################################
# Method -__init__ #
# __init__ method for MaxThreadsContraint #
# class #
###################################################
def __init__(self,name,count,targetType,targets,defaultMBeanHierarchy):
self.name=name
self._count=count
self.targetType=targetType
self.targets=targets
self.defaultMBeanHierarchy=defaultMBeanHierarchy
###################################################
# Method - action #
# Overriden method to configure #
# MaxThreadsContraint for the Work #
# Manager #
###################################################
def action(self):
wlstModule.cd(self.defaultMBeanHierarchy)
try:
wlstModule.cmo.createMaxThreadsConstraint(self.name)
except BeanAlreadyExistsException:
self.print_message(" MaxThreadsConstraints "+self.name+" already exists")
pass
wlstModule.cd(self.defaultMBeanHierarchy+'/MaxThreadsConstraints/'+self.name)
wlstModule.cmo.setCount(int(self._count))
self.set_targets()
class CapacityConstraint(WlstObject):
_count=None
###################################################
# Method -__init__ #
# __init__ method for CapacityContraint #
# class #
###################################################
def __init__(self,name,count,targetType,targets,defaultMBeanHierarchy):
self.name=name
self._count=count
self.targetType=targetType
self.targets=targets
self.defaultMBeanHierarchy=defaultMBeanHierarchy
###################################################
# Method - action #
# Overriden method to configure #
# CapacityContraint for the Work #
# Manager #
###################################################
def action(self):
wlstModule.cd(self.defaultMBeanHierarchy)
try:
wlstModule.cmo.createCapacity(self.name)
except BeanAlreadyExistsException:
self.print_message(" CapacityConstraint "+self.name+" already exists")
pass
wlstModule.cd(self.defaultMBeanHierarchy+'/Capacities/'+self.name)
wlstModule.cmo.setCount(int(self._count))
self.set_targets()
if __name__=="main":
w = WorkManagerObject(sys.argv[1],sys.argv[2])
print os.path.abspath("../../../")
sys.path.append(os.path.abspath("../../../"))
Below is the weblogic 12c Maven example to create the Work Manager through Maven.
pom.xml
The script takes two property files :4.0.0 techsamples.fmw parent 1.0 techsamples.fmw wm pom 1.0 wm /XXXXXXXX/wlst/base/dev_common.properties /XXXXXXXX/wlst/wm/dev_workmanager.properties com.oracle.weblogic weblogic-maven-plugin 12.1.3-0-0 /XXXXXXXXX/Oracle/bpm12c wlst-execute deploy wlst /XXXXXXXX/Oracle/bpm12c ${project.basedir}/workManagerObject.py ${common.propeties.file} ${wm.properties.file} true false true wls
- dev_common.properties - Contains the environment related configurations and will be used to execute the control/edit wlst commands against the weblogic server.admin.target.server=localhost
admin.target.port=7101 admin.target.user=weblogic admin.target.password=weblogic1 wls.domain.name=DefaultDomain
- dev_workmanager.properties - Contains the work manager related configurations.
################################################### # Name - dev_workmanager.properties # # Author - gkrishna # # Version - 1.0 # ################################################### WorkManagers=TestWorkManager1 TestWorkManager2 ########## Work Manager ########## TestWorkManager1.name=TestWorkManager1 TestWorkManager1.targets=DefaultServer TestWorkManager1.targetType=Server TestWorkManager1.ignoreStuckThread=True TestWorkManager2.name=TestWorkManager2 TestWorkManager2.targets=DefaultServer TestWorkManager2.targetType=Server TestWorkManager2.ignoreStuckThread=True ########## Minimum Threads Constraint ########## TestWorkManager1.minThreadsConstraint.name=TestWorkManager1MinThreadsConstraint TestWorkManager1.minThreadsConstraint.count=10 TestWorkManager2.minThreadsConstraint.name=TestWorkManager2MinThreadsConstraint TestWorkManager2.minThreadsConstraint.count=20 ########## Maximum Threads Constraint ########## TestWorkManager1.maxThreadsConstraint.name=TestWorkManager1MaxThreadsConstraint TestWorkManager1.maxThreadsConstraint.count=20 TestWorkManager2.maxThreadsConstraint.name=TestWorkManager2MaxThreadsConstraint TestWorkManager2.maxThreadsConstraint.count=30 ########## Capacity Constraints ########## TestWorkManager1.capacityConstraint.name=TestWorkManager1CapacityConstraint TestWorkManager1.capacityConstraint.count=40 TestWorkManager2.capacityConstraint.name=TestWorkManager2CapacityConstraint TestWorkManager2.capacityConstraint.count=40Before we execute the pom file to create the work managers, lets take a snapshot of the existing work managers to identify the difference after executing the script.
mvn clean deploy
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