Here is the callstacks with the latest changes.

2016-06-03 14:32:32,766 WARN [Timer-Driven Process Thread-4] 
o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding 
PutFileAzureDLStore[id=2133fdad-54b7-46a5-9bcf-958ddd8cfac0] due to uncaught 
Exception: com.microsoft.rest.ServiceException: Invalid status code 403
2016-06-03 14:32:32,768 WARN [Timer-Driven Process Thread-4] 
o.a.n.c.t.ContinuallyRunProcessorTask
com.microsoft.rest.ServiceException: Invalid status code 403
                at 
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
~[na:1.8.0_77]
                at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
 ~[na:1.8.0_77]
                at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 ~[na:1.8.0_77]
                at 
java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_77]
                at 
com.microsoft.rest.ServiceResponseBuilder.build(ServiceResponseBuilder.java:147)
 ~[na:na]
                at 
com.microsoft.azure.management.datalake.store.FileSystemOperationsImpl.createDelegate(FileSystemOperationsImpl.java:1491)
 ~[na:na]
                at 
com.microsoft.azure.management.datalake.store.FileSystemOperationsImpl.create(FileSystemOperationsImpl.java:1432)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.CreateFile(PutFileAzureDLStore.java:252)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.onTrigger(PutFileAzureDLStore.java:217)
 ~[na:na]
                at 
org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
 ~[nifi-api-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1057)
 ~[nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:123)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_77]
                at 
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 [na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_77]

Here is the library codes:

https://github.com/Azure/autorest-clientruntime-for-java/blob/master/client-runtime/src/main/java/com/microsoft/rest/AutoRestBaseUrl.java
https://github.com/Azure
https://github.com/Azure/azure-sdk-for-java

Thanks
Kumiko
From: Oleg Zhurakousky [mailto:ozhurakou...@hortonworks.com]
Sent: Friday, June 3, 2016 2:10 PM
To: users@nifi.apache.org
Subject: Re: Custom processor is failing for concurrency

Kumiko

It appears that the current state of the source you linked in is not in sync 
with what is in the stack trace. Perhaps you have made some code modifications 
(e.g., line 218 is an empty line in code while it has a pointer in the star 
trace).
In any event, from what I can see the error is coming from Azure libraries (not 
NiFi). Specifically ‘com.microsoft.rest.AutoRestBaseUrl.url(..)’ seems to be 
doing some iteration where I presume the remove is called. Perhaps it is not a 
thread safe class after all. What does Microsoft documentation says? Have you 
looked at the source to see what’s going on there? If its open please link and 
we can tale a look.

Cheers
Oleg

On Jun 3, 2016, at 4:58 PM, Kumiko Yada 
<kumiko.y...@ds-iq.com<mailto:kumiko.y...@ds-iq.com>> wrote:

Here is the code, https://github.com/kyada1/PutFileAzureDLStore.

Thanks
Kumiko

From: Bryan Bende [mailto:bbe...@gmail.com]
Sent: Friday, June 3, 2016 12:57 PM
To: users@nifi.apache.org<mailto:users@nifi.apache.org>
Subject: Re: Custom processor is failing for the custom processor

Hello,

Would you be able to share your code for PutFileAzureDLStore so we can help 
identify if there is a concurrency problem?

-Bryan

On Fri, Jun 3, 2016 at 3:39 PM, Kumiko Yada 
<kumiko.y...@ds-iq.com<mailto:kumiko.y...@ds-iq.com>> wrote:
Hello,

I wrote the following custom service control and processor.  When the custom 
processor is running concurrently, it’s failing often with several different 
errors.  Are there any special handlings for concurrently that I need to add in 
the custom processor?  I wrote the sample Java program which does the same 
thing as the custom processor (authenticate every time the file is 
created/create a file, create 2 threads and run concurrently), it’s working 
fine.  The custom processor also fine when this is not running concurrently.

Custom service control – set the properties for the Microsoft Azure Datalake 
Store
Custom processor – authenticate, then create a file in Microsoft Azure Datalake 
Store

Error1:
2016-06-03 12:29:31,942 INFO [pool-2815-thread-1] 
c.m.aad.adal4j.AuthenticationAuthority [Correlation ID: 
64c89876-2f7b-4fbb-8e6f-fb395a47aa87] Instance discovery was successful
2016-06-03 12:29:31,946 ERROR [Timer-Driven Process Thread-10] 
n.a.d.processors.PutFileAzureDLStore
java.util.ConcurrentModificationException: null
                at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) 
~[na:1.8.0_77]
                at java.util.HashMap$EntryIterator.next(HashMap.java:1463) 
~[na:1.8.0_77]
                at java.util.HashMap$EntryIterator.next(HashMap.java:1461) 
~[na:1.8.0_77]
                at 
com.microsoft.rest.AutoRestBaseUrl.url(AutoRestBaseUrl.java:28) ~[na:na]
                at retrofit2.RequestFactory.create(RequestFactory.java:50) 
~[na:na]
                at retrofit2.OkHttpCall.createRawCall(OkHttpCall.java:181) 
~[na:na]
                at retrofit2.OkHttpCall.execute(OkHttpCall.java:165) ~[na:na]
                at 
com.microsoft.azure.management.datalake.store.FileSystemOperationsImpl.create(FileSystemOperationsImpl.java:1432)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.CreateFile(PutFileAzureDLStore.java:252)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.onTrigger(PutFileAzureDLStore.java:218)
 ~[na:na]
                at 
org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
 ~[nifi-api-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1057)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:123)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_77]
                at 
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 [na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_77]
                at java.lang.Thread.run(Thread.java:745) [na:1.8.0_77]

Error2:
2016-06-03 12:29:24,913 WARN [Timer-Driven Process Thread-5] 
o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding 
PutFileAzureDLStore[id=2133fdad-54b7-46a5-9bcf-958ddd8cfac0] due to uncaught 
Exception: com.microsoft.rest.ServiceException: Invalid status code 403
2016-06-03 12:29:24,915 WARN [Timer-Driven Process Thread-5] 
o.a.n.c.t.ContinuallyRunProcessorTask
com.microsoft.rest.ServiceException: Invalid status code 403
                at 
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
~[na:1.8.0_77]
                at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
 ~[na:1.8.0_77]
                at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 ~[na:1.8.0_77]
                at 
java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_77]
                at 
com.microsoft.rest.ServiceResponseBuilder.build(ServiceResponseBuilder.java:147)
 ~[na:na]
                at 
com.microsoft.azure.management.datalake.store.FileSystemOperationsImpl.createDelegate(FileSystemOperationsImpl.java:1491)
 ~[na:na]
                at 
com.microsoft.azure.management.datalake.store.FileSystemOperationsImpl.create(FileSystemOperationsImpl.java:1432)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.CreateFile(PutFileAzureDLStore.java:252)
 ~[na:na]
                at 
nifi.azure.dlstore.processors.PutFileAzureDLStore.onTrigger(PutFileAzureDLStore.java:218)
 ~[na:na]
                at 
org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
 ~[nifi-api-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1057)
 ~[nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:123)
 [nifi-framework-core-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
                at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_77]
                at 
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 [na:1.8.0_77]
                at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 [na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[na:1.8.0_77]
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_77]

Thanks
Kumiko

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