> On Sep 24, 2016, at 5:11 AM, Allen Wittenauer <[email protected]>
> wrote:
>
>
>> On Sep 24, 2016, at 4:24 AM, Steve Loughran <[email protected]> wrote:
>>
>>
>> On 23 Sep 2016, at 18:55, Andrew Wang
>> <[email protected]<mailto:[email protected]>> 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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