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HDFS >> mail # dev >> Deprecate hftp / hsftp


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Re: Deprecate hftp / hsftp
I meant HDP 1.3, which is based on Hadoop 1.2.

~Haohui

On Tue, Nov 26, 2013 at 2:19 PM, Haohui Mai <[EMAIL PROTECTED]> wrote:

> Hi Lohit,
>
> Some of our customers are running Hadoop 1.3, and they run distcp to
> transfer data via webhdfs in production.
>
> We use distcp to transfer data between Hadoop 1.x and Hadoop 2.x. As far
> as I know webhdfs is the most reliable way to transfer data between secure
> and insecure clusters across different Hadoop versions.
>
> ~Haohui
>
>
> On Tue, Nov 26, 2013 at 1:51 PM, lohit <[EMAIL PROTECTED]> wrote:
>
>> Curious to know usage of webhdfs for Hadoop 1.0. Are people using it in
>> production?
>> Reason I ask is because we use lot of hftp to transfer data between Hadoop
>> 1.0 and Hadoop 2.0 as of today.
>> Removing hftp would mean that anyone using Hadoop 1.0 and Hadoop 3.0 would
>> have to move to webhdfs, right?
>>
>>
>>
>> 2013/11/26 Suresh Srinivas <[EMAIL PROTECTED]>
>>
>> > Thanks Haohui for all your hard work in this area. I am +1 on this
>> > proposal.
>> >
>> >
>> > On Tue, Nov 26, 2013 at 12:50 PM, Haohui Mai <[EMAIL PROTECTED]>
>> wrote:
>> >
>> > > Hi,
>> > >
>> > > Recently I've been focusing on fixing hftp / hsftp / webhdfs /
>> swebhdfs
>> > in
>> > > various set ups. Now we have reached the state that all the above file
>> > > systems can work in both secure and insecure clusters, and transfer
>> data
>> > > through both http and https.
>> > >
>> > > Taking a step back, these file systems are very similar, and I'm
>> > wondering
>> > > whether it is a good time to deprecate hftp and hsftp in Hadoop right
>> > now.
>> > >
>> > > The main reason is that hftp / hsftp only provides a strict subset of
>> > > functionalities that webhdfs / swebhdfs offer. Notably, webhdfs /
>> > swebhdfs
>> > > support writes and HA which hftp / hsftp do not support. It's more
>> > natural
>> > > to move forward with webhdfs / swebhdfs, keeping both hftp / hsftp
>> around
>> > > seems introducing more work.
>> > >
>> > > Another reason is that webhdfs has been supported since Hadoop 1, thus
>> > > getting rid of hftp / hsftp does not seem removing any features, even
>> the
>> > > users are trying to migrate from Hadoop 1 to Hadoop 2.
>> > >
>> > >
>> > > Your ideas are appreciated.
>> > >
>> > > Thanks,
>> > > Haohui
>> > >
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>> Have a Nice Day!
>> Lohit
>>
>
>

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