20170405,23:26:55,UNIFY Identity Broker,Change detection engine,Error,"Change detection engine import all items failed.
Change detection engine import all items for connector Google Gmail (STAFF) Connector failed with reason One or more errors occurred.. Duration: 00:03:08.9821524
Error details:
System.AggregateException: One or more errors occurred. ---> System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](IEnumerable`1 source, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEach[TSource](IEnumerable`1 source, Action`1 body)
   at Unify.Product.IdentityBroker.GoogleAgent.<UserSettingsGet>d__49.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__16`2.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__16`2.MoveNext()
   at Unify.Framework.Collections.EnumerableExtensions.<ActionOnLast>d__10`1.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at Unify.Framework.Collections.ActionOnExceptionEnumerator`1.MoveNext()
   at Unify.Framework.Collections.EnumerableExtensions.<ActionOnLast>d__10`1.MoveNext()
   at Unify.Framework.Collections.EnumerableExtensions.<ProduceAutoPages>d__7`1.MoveNext()
   at Unify.Framework.Visitor.ThreadsafeVisitorEvaluator`1.Visit()
   at Unify.Framework.Visitor.VisitEvaluateOnThreadPool[T](IEnumerable`1 visitCollection, Action`2 visitor, Int32 maxThreads)
   at Unify.Product.IdentityBroker.RepositoryChangeDetectionWorkerBase.PerformChangeDetection(IEnumerable`1 connectorEntities)
   at Unify.Product.IdentityBroker.ChangeDetectionImportAllJob.ImportAllChangeProcess()
   at Unify.Product.IdentityBroker.ChangeDetectionImportAllJob.RunBase()
   at Unify.Framework.DefinedScopeJobAuditTrailJobDecorator.Run()
   at Unify.Product.IdentityBroker.ConnectorJobExecutor.<>c__DisplayClass29.<Run>b__27()
   at Unify.Framework.AsynchronousJobExecutor.PerformJobCallback(Object state)
---> (Inner Exception #0) System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )<---

---> (Inner Exception #1) System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )<---

---> (Inner Exception #2) System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass99_0.<InnerUserSettingsGet>b__3()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )<---

---> (Inner Exception #3) System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )<---

---> (Inner Exception #4) System.Exception: An exception was thrown on the last attempt of retry (6). See inner exception for details. ---> System.InvalidOperationException: There were not enough free threads in the ThreadPool to complete the operation.
   at Google.Apis.Requests.ClientServiceRequest`1.Execute()
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   --- End of inner exception stack trace ---
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass68_0`1.<BackoffRetry>b__2()
   at Unify.Product.IdentityBroker.GoogleAgent.ThrowIfPrimaryCall(Boolean primaryCall, Action throwException)
   at Unify.Product.IdentityBroker.GoogleAgent.BackoffRetry[TResult](String logEvent, Boolean throwExceptions, Func`1 request, Action newClient, TResult& result, Int32 retries)
   at Unify.Product.IdentityBroker.GoogleAgent.InnerUserSettingsGet(GmailService client, Func`1 getClient, String email, Boolean getLabels, Boolean getSendAs, Boolean getForwarding, Boolean getPop, Boolean getImap, Boolean getVacation)
   at Unify.Product.IdentityBroker.GoogleAgent.<>c__DisplayClass49_1.<UserSettingsGet>b__1(String email)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object )<---
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