> On Sep 24, 2016, at 5:11 AM, Allen Wittenauer <a...@effectivemachines.com> 
> wrote:
> 
> 
>> On Sep 24, 2016, at 4:24 AM, Steve Loughran <ste...@hortonworks.com> wrote:
>> 
>> 
>> On 23 Sep 2016, at 18:55, Andrew Wang 
>> <andrew.w...@cloudera.com<mailto:andrew.w...@cloudera.com>> wrote:
>> 
>> Have you git blamed to dig up the original JIRA conversation? I think that 
>> deprecation predates many of us, so you might not get much historical 
>> perspective from the mailing list.
>> 
>> its so old that it's lost in the history of the "show git history for 
>> selection" feature in IDEA which does exactly that.
>> 
>> I'm happy to lend a +1 though, since like you said, it doesn't seem like 
>> that config key is going anywhere.
>> 
> 
>       dfs.bytes-per-checksum was added as part of HADOOP-6419 / 
> 00de6db0e3976cf0108010ecbd6e73a5ceab7b1f.  It looks like the 
> internal-to-Yahoo! commit that was part of that one accidentally included a 
> lot more than what was documented. So if there is any ASF-level documentation 
> of the change, it's going to be in a JIRA patch somewhere, likely in the 0.20 
> timeline.
> 

        OK neat.  It was added then, but not actually used until HDFS-631.... 
which you'll find in the old hadoop-hdfs tree as part of 0.21. So it was 
trapped in the project split... which is why it's mainly stuff outside of HDFS 
that is still using it. I have a hunch that HDFS-2000 was basically 
misguided(?): it was deprecated for HDFS's internal usage but needed in common 
for non-HDFS file systems to set.  So it's not REALLY deprecated in the classic 
sense.

        Definitely need better documentation here. :/
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