top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What happens to a read operation when the file is moved to trash in HDFS?

0 votes
354 views

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.

posted Mar 8, 2016 by Naveena Garg

Looking for an answer?  Promote on:
Facebook Share Button Twitter Share Button LinkedIn Share Button

Similar Questions
0 votes
How to get info about which data in hdfs or file system that a MapReduce job visits?

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?

+4 votes
Add few record(s) to a Hive table or a HDFS file on a daily basis

My requirement is a typical Datawarehouse and ETL requirement. I need to accomplish

1) Daily Insert transaction records to a Hive table or a HDFS file. This table or file is not a big table ( approximately 10 records per day). I don't want to Partition the table / file.

In few articles It was being mentioned that we need to load to a staging table in Hive. And then insert like the below : 

insert overwrite table finaltable select * from staging;

I am not getting this logic. How should I populate the staging table daily.

0 votes
Can the blocks be broken in HDFS file system?

If there are 10 HDFS blocks to be copied from one machine to another. However, the other machine can copy only 7.5 blocks, is there a possibility for the blocks to be broken down during the time of replication?

+1 vote
Partition file by content based through HDFS

When a user is uploading a file from the local disk to its HDFS, can I make it partition the file into blocks based on its content?

Meaning, if I have a file with one integer column, can i say, I want the hdfs block to have even numbers?

...