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From Josh Elser <>
Subject Re: Kerberos ticket renewal
Date Tue, 11 Jul 2017 15:17:47 GMT
Nope, you've got it exactly right! That's the code I would've pointed 
you at to copy :)

If/when you do get to long-running MR jobs, see the 
"general.delegation.token.*" configuration properties in this table[1]. 
I think the docs are citing that one delegation token is valid for 7 
days, but it's been a long time since writing/testing that code.

- Josh


On 7/11/17 1:25 AM, James Srinivasan wrote:
> Thanks both. I can't (easily) upgrade beyond 1.7.0, but have raised a
> support case with our Hadoop distribution vendor.
> I'm not (yet) worried about expiration with MapReduce - for now I'll
> try to keep such jobs to under 24h! Outside MR, sounds like I just
> need to periodically call
> UserGroupInformation.checkTGTAndReloginFromKeytab like
> Or is the TGT associated with an Accumulo KerberosToken separate?
> Thanks,
> James
> On 11 July 2017 at 02:59, Josh Elser <> wrote:
>> No, you are (likely) not running into ACCUMULO-4069. What you've
>> described sounds like your client's ticket expired. Accumulo does not
>> spawn any ticket renewal on the behalf of clients.
>> Hadoop's UGI code will automatically spawn a renewal thread when you
>> log in using a ticket cache. This does not happen automatically when
>> you use a keytab (I have no explanation as to why this is). This is
>> the most likely cause of your error and something you need to correct
>> in your application (spawn a thread to renew your application's
>> ticket).
>> If you are using MapReduce, you have yet another layer of indirection
>> with DelegationTokens, but that's probably not what you're seeing (as
>> DelegationTokens don't actually have a Kerberos TGT).
>> On Mon, Jul 10, 2017 at 5:42 PM, Christopher <> wrote:
>>> It certainly sounds like the same issue. I'd recommend upgrading to the
>>> latest 1.7.3 (currently the latest 1.7 version) to include all the bugs
>>> we've found and fixed in that release line.
>>> On Mon, Jul 10, 2017 at 5:50 AM James Srinivasan
>>> <> wrote:
>>>> I'm using Accumulo 1.7.0 and finding that after some period of time
>>>> (>8 hours, <3 days - happened over the weekend) my ingest fails with
>>>> errors regarding "Failed to find any Kerberos tgt". My guess is that
>>>> the ticket from the keytab has expired, and needs to be renewed - from
>>>> memory, I had seen a Kerberos tgt renewer thread running in my client,
>>>> so assumed it happened automagically. Is that the case? Perhaps I am
>>>> hitting this bug?
>>>> Thanks,
>>>> James

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