Github user nvazquez commented on the issue:

    https://github.com/apache/cloudstack/pull/1944
  
    Hi @rhtyd, thanks for this great improvement! Along with @serg38 we've been 
testing in our env and got some failures on `listHostsMetrics` and 
`listVolumeMetrics`:
    
    ````
    test_list_clusters_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_clusters_metrics | Status : SUCCESS ===
    ok
    test_list_hosts_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_hosts_metrics | Status : EXCEPTION ===
    ERROR
    test_list_infrastructure_metrics (test_metrics_api.TestMetrics) ... === 
TestName: test_list_infrastructure_metrics | Status : SUCCESS ===
    ok
    test_list_pstorage_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_pstorage_metrics | Status : SUCCESS ===
    ok
    test_list_vms_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_vms_metrics | Status : SUCCESS ===
    ok
    test_list_volumes_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_volumes_metrics | Status : EXCEPTION ===
    ERROR
    test_list_zones_metrics (test_metrics_api.TestMetrics) ... === TestName: 
test_list_zones_metrics | Status : SUCCESS ===
    ok
    ````
    ````
    [root@ussarlabcsmgt41 cloudstack]# cat 
/tmp//MarvinLogs//1A23HU/failed_plus_exceptions.txt
    2017-03-31 10:21:19,514 - CRITICAL - EXCEPTION: test_list_hosts_metrics: 
['Traceback (most recent call last):\n', '  File 
"/usr/local/lib/python2.7/unittest/case.py", line 331, in run\n    
testMethod()\n', '  File 
"/home/t_vazqnadmin/cloudstack/test/integration/smoke/test_metrics_api.py", 
line 77, in test_list_hosts_metrics\n    host_metric = 
self.apiclient.listHostsMetrics(cmd)[0]\n', '  File 
"/usr/local/lib/python2.7/site-packages/marvin/cloudstackAPI/cloudstackAPIClient.py",
 line 3094, in listHostsMetrics\n    response = 
self.connection.marvinRequest(command, response_type=response, 
method=method)\n', '  File 
"/usr/local/lib/python2.7/site-packages/marvin/cloudstackConnection.py", line 
379, in marvinRequest\n    raise e\n', "CloudstackAPIException: Execute cmd: 
listhostsmetrics failed, due to: errorCode: 530, errorText:No value specified 
for 'Date'\n"]
    2017-03-31 10:23:50,276 - CRITICAL - EXCEPTION: test_list_volumes_metrics: 
['Traceback (most recent call last):\n', '  File 
"/usr/local/lib/python2.7/unittest/case.py", line 331, in run\n    
testMethod()\n', '  File 
"/home/t_vazqnadmin/cloudstack/test/integration/smoke/test_metrics_api.py", 
line 172, in test_list_volumes_metrics\n    lvm = 
self.apiclient.listVolumesMetrics(cmd)[0]\n', '  File 
"/usr/local/lib/python2.7/site-packages/marvin/cloudstackAPI/cloudstackAPIClient.py",
 line 954, in listVolumesMetrics\n    response = 
self.connection.marvinRequest(command, response_type=response, 
method=method)\n', '  File 
"/usr/local/lib/python2.7/site-packages/marvin/cloudstackConnection.py", line 
379, in marvinRequest\n    raise e\n', "CloudstackAPIException: Execute cmd: 
listvolumesmetrics failed, due to: errorCode: 530, errorText:No value specified 
for 'Date'\n"]
    ````
    Exception is thrown by `BeanUtils.copyProperties`, log on management server:
    ````
    2017-03-31 10:28:33,257 ERROR [cloud.api.ApiServer] 
(catalina-exec-15:ctx-7fb0b31e ctx-6ded5acb) unhandled exception executing api 
command: [Ljava.lang.String;@63f1496d
    org.apache.commons.beanutils.ConversionException: No value specified for 
'Date'
            at 
org.apache.commons.beanutils.converters.AbstractConverter.handleMissing(AbstractConverter.java:310)
            at 
org.apache.commons.beanutils.converters.AbstractConverter.convert(AbstractConverter.java:136)
            at 
org.apache.commons.beanutils.converters.ConverterFacade.convert(ConverterFacade.java:60)
            at 
org.apache.commons.beanutils.BeanUtilsBean.convert(BeanUtilsBean.java:1078)
            at 
org.apache.commons.beanutils.BeanUtilsBean.copyProperty(BeanUtilsBean.java:437)
            at 
org.apache.commons.beanutils.BeanUtilsBean.copyProperties(BeanUtilsBean.java:286)
            at 
org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:137)
            at 
org.apache.cloudstack.metrics.MetricsServiceImpl.listHostMetrics(MetricsServiceImpl.java:244)
            at 
org.apache.cloudstack.api.ListHostsMetricsCmd.execute(ListHostsMetricsCmd.java:48)
            at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:150)
            at com.cloud.api.ApiServer.queueCommand(ApiServer.java:709)
            at com.cloud.api.ApiServer.handleRequest(ApiServer.java:533)
            at 
com.cloud.api.ApiServlet.processRequestInContext(ApiServlet.java:299)
            at com.cloud.api.ApiServlet$1.run(ApiServlet.java:129)
            at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
            at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
            at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
            at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:126)
            at com.cloud.api.ApiServlet.doGet(ApiServlet.java:88)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
            at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
            at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
            at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
            at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
            at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
            at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
            at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
            at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
            at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:299)
            at 
org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:889)
            at 
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:732)
            at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2274)
            at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
            at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
            at java.lang.Thread.run(Thread.java:745)
    ````
    In our case it failed for this `hostResponse`:
    ````
    
{"id":"be606171-57e0-4cef-99e3-d4f2d47478b4","name":"ussfoldcsesx116.adslab.local","state":"Up","disconnected":"Mar
 29, 2017 11:24:21 
PM","type":"Routing","ipaddress":"10.140.32.116","zoneid":"0d074f25-ed31-482f-8bc5-44c9314fc417","zonename":"ECS-NSX","podid":"01d4848c-5357-442a-bfce-d0c691fe5bdf","podname":"POD1","version":"4.9.3.0-SNAPSHOT","hypervisor":"VMware","cpusockets":2,"cpunumber":48,"cpuspeed":2596,"cpuallocated":"1.2%","cpuused":"0.3%","cpuwithoverprovisioning":"124608.0","networkkbsread":0,"networkkbswrite":0,"memorytotal":137308676096,"memoryallocated":2147483648,"memoryused":6262890496,"capabilities":"hvm","lastpinged":"Jan
 17, 1970 12:27:11 
PM","managementserverid":345051565299,"clusterid":"e13b0968-a61e-474f-939e-8d03a088a9cc","clustername":"ussfoldvs6vc027.adslab.local/ECS-CSDEV/CLD100","clustertype":"ExternalManaged","islocalstorageactive":false,"created":"Apr
 19, 2016 3:19:24 PM","events":"PingTimeout; StartAgentRebalance; HostDown; 
AgentConnected; AgentDiscon
 nected; ManagementServerDown; ShutdownRequested; Ping; 
Remove","hosttags":"test","outofbandmanagement":{"powerstate":"Disabled","enabled":false},"resourcestate":"Enabled","hypervisorversion":"6.0","hahost":false}
    ````
    And `metricsResponse` after failure:
    ````
    
{"id":"be606171-57e0-4cef-99e3-d4f2d47478b4","name":"ussfoldcsesx116.adslab.local","disconnected":"Mar
 29, 2017 11:24:21 
PM","type":"Routing","ipaddress":"10.140.32.116","podid":"01d4848c-5357-442a-bfce-d0c691fe5bdf","podname":"POD1","hypervisor":"VMware","cpusockets":2,"cpunumber":48,"cpuspeed":2596,"cpuallocated":"1.2%","cpuused":"0.3%","cpuwithoverprovisioning":"124608.0","averageload":0,"networkkbsread":0,"networkkbswrite":0,"memorytotal":137308676096,"memoryallocated":2147483648,"memoryused":6262890496,"disksizetotal":0,"disksizeallocated":0,"capabilities":"hvm","lastpinged":"Jan
 17, 1970 12:27:11 
PM","managementserverid":345051565299,"clusterid":"e13b0968-a61e-474f-939e-8d03a088a9cc","clustername":"ussfoldvs6vc027.adslab.local/ECS-CSDEV/CLD100","clustertype":"ExternalManaged","islocalstorageactive":false,"created":"Apr
 19, 2016 3:19:24 PM","events":"PingTimeout; StartAgentRebalance; HostDown; 
AgentConnected; AgentDisconnected; ManagementServerDown; ShutdownRequested; 
Ping; 
 
Remove","hosttags":"test","hasenoughcapacity":false,"hypervisorversion":"6.0","hahost":false,"jobstatus":0}
    ````
    
    Did you have a failure like this?


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