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From Vivi Lang <sqlxwei...@gmail.com>
Subject Re: A question about reading one block
Date Wed, 31 Oct 2012 20:05:08 GMT
Hi, thks for the replying.

Is there any function can help me to create a InputStream for a certain
Block which stored in a certain datanode
Thanks,

On Sat, Oct 27, 2012 at 9:41 PM, Harsh J <harsh@cloudera.com> wrote:

> Vivi,
>
> Assuming you know how to get the block info out of a file's metadata,
> opening a file for read (with FileSystem.open API, etc.) with an
> offset and length set to to match that of a block, will open and read
> only that block.
>
> On Sat, Oct 27, 2012 at 2:19 AM, Vivi Lang <sqlxweiwei@gmail.com> wrote:
> > Hi guys,
> >
> > I am writing a program which need the data of several specific blocks (I
> > know the blockinfo of those blocks), if I use the Hadoop 0.20, is there
> > any  funtion which can help me to retrieve the content of block?
> >
> > Thanks,
> > Vivi
>
>
>
> --
> Harsh J
>

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