[jira] [Created] (NIFI-6507) ConsumeWindowsEventLog should renew failed subscription

["Koji Kawamura (JIRA)" <ji...@apache.org>]

Koji Kawamura created NIFI-6507:
-----------------------------------

             Summary: ConsumeWindowsEventLog should renew failed subscription
                 Key: NIFI-6507
                 URL: https://issues.apache.org/jira/browse/NIFI-6507
             Project: Apache NiFi
          Issue Type: Bug
          Components: Extensions
            Reporter: Koji Kawamura
            Assignee: Koji Kawamura


Current implementation has some code for specific 15011 error code. The processor uses EvtSubscribeStrict flag which produces ERROR_EVT_QUERY_RESULT_STALE (15011) event when event records are missing. Currently, the processor only logs the error code. But does not renew subscription.

[https://docs.microsoft.com/en-us/windows/desktop/api/winevt/nc-winevt-evt_subscribe_callback]

 

When error 15011 happens, the processor stopped reading further events. It looks as if the processor hangs. The processor doesn't renew subscription because it thinks it already has a valid subscription. The current implementation determines if a subscription is valid by these lines of code: 
{code:java}
private boolean isSubscribed() {
    return subscriptionHandle != null && subscriptionHandle.getPointer() != null;
}{code}
[https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-windows-event-log-bundle/nifi-windows-event-log-processors/src/main/java/org/apache/nifi/processors/windows/event/log/ConsumeWindowsEventLog.java#L242-L244]

If already subscribed, the processor polls received messages from the internal queue. But since the subscription has encountered an error, no further messages available.



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