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Hadoop, mail # user - RandomAccessFile with HDFS


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Re: RandomAccessFile with HDFS
Aaron Kimball 2009-09-22, 22:50
Or maybe more pessimistically, the second "stable" append implementation.

It's not like HADOOP-1700 wasn't intended to work. It was just found not to
after the fact. Hopefully this reimplementation will succeed. If you're
running a cluster that contains mission-critical data that cannot tolerate
corruption or loss, you shouldn't jump on the new-feature bandwagon until
it's had time to prove itself in the wild.

But yes, we hope that appends will really-truly work in 0.21.
Experimental/R&D projects should be able to plan on having a working append
function in 0.21.

- Aaron

On Sun, Sep 20, 2009 at 3:58 PM, Stas Oskin <[EMAIL PROTECTED]> wrote:

> Hi.
>
> Just to understand the road-map, 0.21 will be the first stable "append"
> implementation?
>
> Regards.
>
> 2009/9/20 Owen O'Malley <[EMAIL PROTECTED]>
>
> >
> > On Sep 13, 2009, at 3:08 AM, Stas Oskin wrote:
> >
> >  Hi.
> >>
> >> Any idea when the "append" functionality is expected?
> >>
> >
> > A working append is a blocker on HDFS 0.21.0.
> >
> > The code for append is expected to be complete in a few weeks. Meanwhile,
> > the rest of Common, HDFS, and MapReduce have feature-frozen and need to
> be
> > stabilized and all of the critical bugs fixed. I'd expect the first
> releases
> > of 0.21.0 in early November.
> >
> > -- Owen
> >
>