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From Todd Lipcon <t...@cloudera.com>
Subject Re: HDFS internal mechanism questions
Date Tue, 12 Oct 2010 16:25:27 GMT
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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