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From Jeff Hammerbacher <ham...@cloudera.com>
Subject Re: HDFS internal mechanism questions
Date Wed, 13 Oct 2010 07:41:31 GMT
Filed https://issues.apache.org/jira/browse/HDFS-1454.

On Tue, Oct 12, 2010 at 9:25 AM, Todd Lipcon <todd@cloudera.com> wrote:

> On Tue, Oct 12, 2010 at 12:37 PM, Jeff Hammerbacher <hammer@cloudera.com>
> wrote:
> >
> >>>    *  It seems that HDFS' staging strategy," In fact, initially the
> HDFS
> >>> client caches the file data into a temporary local file. Application
> writes
> >>> are transparently redirected to this temporary local file" , is quite
> >>> different from the original GFS paper (see Section 2.3 of GFS paper
> "neither
> >>> client nor the chunkserver caches file data"). Can someone help me
> >>> understanding it ?
> >>>
> >>
> >> People keep referencing this on the list, but it hasn't been that way in
> >> about 3 years :) Where do you see this, so we can update the docs?
> >
> > I believe the "Staging" section of
> >
> http://hadoop.apache.org/hdfs/docs/r0.21.0/hdfs_design.html#Data+Organization
> > is the culprit. If you agree, I'll file the JIRA.
>
> Aha! That is full of lies!
>
> -Todd
>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>

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