-Re: A question about reading one block
Vivi Lang 2012-10-31, 21:31
Please ignore the previous email which I did not describe the problem
On Wed, Oct 31, 2012 at 3:05 PM, Vivi Lang <[EMAIL PROTECTED]> wrote:
> 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
> On Sat, Oct 27, 2012 at 9:41 PM, Harsh J <[EMAIL PROTECTED]> wrote:
>> 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 <[EMAIL PROTECTED]> 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