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Posted to common-user@hadoop.apache.org by elton sky <el...@gmail.com> on 2010/06/22 10:26:18 UTC

Can we modify existing file in HDFS?

hello everyone,

I noticed there are 6 operations in HDFS:
OP_WRITE_BLOCK
OP_READ_BLOCK
OP_READ_METADATA
OP_REPLACE_BLOCK
OP_COPY_BLOCK
OP_BLOCK_CHECKSUM

and As I know there's no way to modify some arbitrary part in a existing
file in HDFS. So what if I create a say, 2 Petabytes, file and like to
modify some parts? Do I need to remove and re-create the whole file?

Re: Can we modify existing file in HDFS?

Posted by Amogh Vasekar <am...@yahoo-inc.com>.

>>Do I need to remove and re-create the whole file?
Simply put, as of now, yes. Append functionality is being made available to users to add to end of file though :)

Amogh


On 6/22/10 1:56 PM, "elton sky" <el...@gmail.com> wrote:

hello everyone,

I noticed there are 6 operations in HDFS:
OP_WRITE_BLOCK
OP_READ_BLOCK
OP_READ_METADATA
OP_REPLACE_BLOCK
OP_COPY_BLOCK
OP_BLOCK_CHECKSUM

and As I know there's no way to modify some arbitrary part in a existing
file in HDFS. So what if I create a say, 2 Petabytes, file and like to
modify some parts? Do I need to remove and re-create the whole file?