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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-337) DFS files should be appendable
Date Sat, 01 Jul 2006 21:32:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-337?page=comments#action_12418809 ] 

eric baldeschwieler commented on HADOOP-337:
--------------------------------------------

We generally support Paul's prioritization.  But we are also going to be moving up the tempo
and volume of data we manage in the system, "A LOT".  If we find a small list of features
to be cost effective investments, we'd like to be able to give them back to the community.

If it makes sense for us to invest significant man-power to produce a patch for this and can
validate that said patch does not destabilize large clusters over a significant period of
operation, I'd assume this wouldn't be that controversial, since this is a very natural extension
of the API that does seem eventually inevitable (along with multiple appenders, which would
be very, very helpful).  I think the thing we need to agree on is the testing criteria for
acceptance, so we're not constantly derailing the community.

Do folks agree with the above?  If so, let's put more energy into thinking about how we are
going to establish a testing / validation regime that will support innovation, rather than
trying to kill innovation for safety's sake.  That way lies madness.  We'll be happy to help
staff / fund such a testing policy.

(Anyone want to create an "enhancement" to discuss HDFS extension validation?)

> DFS files should be appendable
> ------------------------------
>
>          Key: HADOOP-337
>          URL: http://issues.apache.org/jira/browse/HADOOP-337
>      Project: Hadoop
>         Type: New Feature

>   Components: dfs
>     Versions: 0.1.0, 0.2.0, 0.1.1, 0.3.0, 0.4.0, 0.2.1, 0.3.1, 0.3.2
>  Environment: all
>     Reporter: Runping Qi

>
> Actually two related issues
> 1. One should be able to open an existing DFS file, to seek to a position and truncate
the rest, and to append starting at the end (or where trancation happens) .
> 2. One should be able to read the writen data of a DFS file while other is writing/appending
to the file

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