Jeff Storck created NIFI-6023:
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Summary: ListHDFS throws misleading exception regarding
Distributed Cache Service
Key: NIFI-6023
URL: https://issues.apache.org/jira/browse/NIFI-6023
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Affects Versions: 1.8.0
Reporter: Jeff Storck
In the `ListHDFS.onTrigger` method, the processor attempts to retrieve the
state for the processor which can throw an IOException. The catch block for
that code logs the exception with a message of `Failed to retrieve timestamp of
last listing from Distributed Cache Service. Will not perform listing until
this is accomplished`. This is misleading, since the DistributedMapCacheClient
is not used by ListHDFS.
The error message should be updated to inform the user of the actual error,
that the state manager could not be reached, or state could not be retrieved
from the state manager. It'd also help to include the exception (stack trace)
itself in the log.
The `Distributed Cache Service` property should be deprecated and its
description should be updated, since the property will be ignored. State is
stored by the state manager locally, or in ZK if NiFi is clustered.
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