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From <Milind.Bhandar...@emc.com>
Subject Re: [DISCUSS] Remove append?
Date Wed, 21 Mar 2012 22:48:16 GMT

If HDFS-3120 is committed to both 1.x and trunk/0.23.x, then one will be
able to disable appends (while keeping hflush) using different config
variables. By default (I.e. In hdfs-default.xlm), we should set
dfs.support.append to false, and dfs.support.hsync to true.

That way, we get enough time to fix append, and if we decide to remove it,
then we can do that without causing major distress in 0.24.

Thoughts ?

- Milind

On 3/21/12 3:16 PM, "Eli Collins" <eli@cloudera.com> wrote:

>On Wed, Mar 21, 2012 at 3:06 PM,  <Milind.Bhandarkar@emc.com> wrote:
>>>Absolutely, I'd like to learn more about what append/truncate buys us.
>> Indeed. Lets postpone this discussion to Q2 then.
>I'd still like to hear what other people think if they haven't chimed
>in.  Even if we decide to remove it, I don't think we need to do so
>next week, eg can wait to hear more about what you're working on.
>One of the reasons I raised this topic now is that it the not too
>distant future 0.23 will become the stable release, and we'll
>effectively lose the ability to remove append once we're stable.  Not
>that I expect people will stabilize append before this happens, it
>doesn't seem to be a priority for anyone, though perhaps you'll end up
>doing that work for your project.
>> Thanks,
>> - milind
>> ---
>> Milind Bhandarkar
>> Greenplum Labs, EMC
>> (Disclaimer: Opinions expressed in this email are those of the author,
>> do not necessarily represent the views of any organization, past or
>> present, the author might be affiliated with.)

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