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From Conrad Crampton <>
Subject Re: ListHDFS cache (again)
Date Wed, 16 Mar 2016 12:42:25 GMT
Hi Mark,
I’m using 0.5.1 and yes I am using DistributedMapCacheClientService (that is the only option
isn’t it?).
Deleting the local file I guess is the piece that I’m missing – recreating the processor
therefore would have a different id and I suppose this is the reason for it starting after

I understand why it would be an edge case to be able to clear the cache for this processor,
but there are times when a major balls up requires one to reprocess a load of files in HDFS!

Thanks, I’ll look out for 0.6


From: Mark Payne <<>>
Reply-To: "<>" <<>>
Date: Wednesday, 16 March 2016 at 12:36
To: "<>" <<>>
Subject: Re: ListHDFS cache (again)


If you are using a version that used DistributedMapCacheClientService, it also was saving
state in a local file,
$NIFI_HOME/conf/state/<processor uuid>

You would need to delete that file, as well. I am not sure though if it would notice that
the file was deleted
without restarting NiFi. That processor wasn't really designed with the intent of allowing
the user to clear
the cache.

That said, in NiFi 0.6.0, which should be coming very soon (hopefully next week?) it has been
to allow users to very easily view and reset the state. Hopefully that will ease the pain
for you.


On Mar 16, 2016, at 4:33 AM, Conrad Crampton <<>>

The subject of invalidating/ resetting the cache/ forcing new listing returned from ListHDFS
was raised back in December 2015 [1] with the ‘resolution’ to delete the backing DistributedMapCacheClientService
and add a different one. I have tried this – recreated completely from scratch, different
name, different node, different port – all manner of combinations, but still the listing
returned from ListHDFS starts where it left off. Satanic forces are at work here on my cluster
I’m sure!!!

The odd thing is that there was an moment when I ran the flow where it did start from scratch
but I can’t remember the circumstances of this. I’ve tried rebooting the NCM to no avail.

Any further suggestions to those in [1] as this is a bit of a show stopper as I can’t get
the data into the flow I want no matter how I try.

I have got this working again, but only by deleting the processor and recreating. A bit of
a faff so would be interested if anyone else had same problem and any tips on a better workaround
than mine.



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