RE: how read a file in HDFS?

[Uma Maheswara Rao G <ma...@huawei.com>]

Yes you can use utility methods from IOUtils

ex:
    FileOutputStream fo = new FileOutputStream (file);
    IOUtils.copyBytes(fs.open(fileName), fo, 1024, true);
here fs is DFS stream.

other option is, you can make use of FileSystem apis.

EX:
 FileSystem fs=new DistributedFileSystem();
 fs.initialize(new URI("namenode_uri"), conf);
 fs.copyToLocalFile(new Path(SRC_PATH),new Path(DST_PATH));

here you can give source path as DFS path and dst path local fileststem path.

hope it helps.

Regards,
Uma
________________________________
From: Pedro Costa [psdc1978@gmail.com]
Sent: Friday, December 16, 2011 9:27 PM
To: mapreduce-user
Subject: Fwd: how read a file in HDFS?



Hi,

I want to read a file that has 100MB of size and it is in the HDFS. How should I do it? Is it with IOUtils.readFully?

Can anyone give me an example?



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