top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What is the process to change the files at arbitrary locations in HDFS?

+2 votes
212 views
What is the process to change the files at arbitrary locations in HDFS?
posted Jan 11, 2017 by Jdk

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+1 vote

HDFS does not support modifications at arbitrary offsets in the file or multiple writers but files are written by a single writer in append only format i.e. writes to a file in HDFS are always made at the end of the file.

answer Jan 25, 2017 by Sathish Kumar
Similar Questions
0 votes

I have a basic question regarding the HDFS file read. I want to know what happens, when the following steps are followed:

  1. Client opens the file for reading and starts reading the file.
  2. In the meantime, someone deletes the file and file moves to the trash folder

Will Step 1. succeed? I feel, since the client has already opened the file and file still exists in .trash, the client should continue to read the file.

0 votes

I was trying to implement a Hadoop/Spark audit tool, but l met a problem that I can't get the input file location and file name. I can get username, IP address, time, user command, all of these info from hdfs-audit.log. But When I submit a MapReduce job, I can't see input file location neither in Hadoop logs or Hadoop ResourceManager.

Does hadoop have API or log that contains these info through some configuration ?If it have, what should I configure?

0 votes

The reason behind this is I want to have my custom user who can create anything on the entire hdfs file system (/).
I tried couple of links however, none of them were useful. Is there any way by adding/modifying some property tags I can do that ?

...