Mailing-List: contact dev-help@accumulo.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@accumulo.apache.org
MIME-Version: 1.0
In-Reply-To: <55E52157.2050604@gmail.com>
References: <1441059216648-15010.post@n5.nabble.com>
	<55E4DAC7.2020601@gmail.com>
	<1441064150934-15013.post@n5.nabble.com>
	<55E4EA20.3020703@gmail.com>
	<1441067325983-15017.post@n5.nabble.com>
	<CADxc9BmJMXbA7yqvy__W91-meLk_BS2H_qKwRhWJUwbArzZFLA@mail.gmail.com>
	<55E52157.2050604@gmail.com>
Date: Mon, 31 Aug 2015 23:58:18 -0400
Message-ID: 
 <CADxc9BnfSoUe_tPN6uHsKMDBWZ1ovvAObKsPuLe3cbvqONiZCQ@mail.gmail.com>
Subject: Re: exception thrown during minor compaction
From: Eric Newton <eric.newton@gmail.com>
To: dev@accumulo.apache.org
Content-Type: multipart/alternative; boundary=001a1134beb26e30c5051ea78fb0

--001a1134beb26e30c5051ea78fb0
Content-Type: text/plain; charset=UTF-8

Sure, but not during a compaction that does not involve all the underlying
files. The delete keys must be propagated.

I'm not completely familiar with the underlying libraries that help you
write iterators, I just know it's a common mistake.


On Mon, Aug 31, 2015 at 11:53 PM, Josh Elser <josh.elser@gmail.com> wrote:

> Shouldn't the delete be masked at a lower layer (DeletingIterator)? Or am
> I forgetting that Combiners see that value somehow (and maybe
> SummingCombiner is broken)?
>
>
> Eric Newton wrote:
>
>> You may be seeing a delete marker.  In a compaction, you will see delete
>> markers, which have an empty value. You will have to check the delete flag
>> on the key before grabbing the Value.
>>
>> -Eric
>>
>> On Mon, Aug 31, 2015 at 8:28 PM, z11373<z11373@outlook.com>  wrote:
>>
>> Thanks Josh! I am going to do more experiments, because this is really
>>> weird.
>>> I'll post the update if there are any interesting stuff I found out
>>> later.
>>>
>>> Thanks,
>>> Z
>>>
>>>
>>>
>>> --
>>> View this message in context:
>>>
>>> http://apache-accumulo.1065345.n5.nabble.com/exception-thrown-during-minor-compaction-tp15010p15017.html
>>> Sent from the Developers mailing list archive at Nabble.com.
>>>
>>>
>>

--001a1134beb26e30c5051ea78fb0--