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From David Medinets <>
Subject Re: File hash key case observation
Date Fri, 06 Dec 2013 04:31:33 GMT
Are you working to ingest a large number of files into Accumulo?

On Thu, Dec 5, 2013 at 11:30 PM, David Medinets <>wrote:

> After ingesting a few million files using the method in the Accumulo File
> System Archive ( we
> ran into a problem reading the information back out of Accumulo. I forget
> the error but I resolved it by using DigestUtils.md5hex instead of
> Digestutils.md5 which stored the md5 as hex string instead of a binary
> value. We did not dig into what caused the error we just side-stepped it.
> On Wed, Dec 4, 2013 at 11:37 PM, Chris Carrino <>wrote:
>> The org.apache.accumulo.examples.simple.filedata.FileDataIngest class
>> generates LOWERCASE hash keys via the hexString() method, and uses them as
>> row ID's for storing file chunks in Accumulo.  Note that NIST uses
>> UPPERCASE hash keys in the Reference Data Set (RDS).  See
>> for the RDS.  Both approaches are valid since
>> the hexadecimal representation of the key is not case sensitive - but make
>> sure you normalize to one case if you are comparing the keys generated in
>> the FileDataIngest class to the RDS keys.

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