What happens when two clients try to write into the same HDFS file?

1.	What happens when two clients try to write into the same HDFS file?
Answer» HDFS supports exclusive writes only. When the first client contacts the name-node to open the file for writing, the name-node grants a lease to the client to create this file. When the second client tries to open the same file for writing, the name-node will see that the lease for the file is already granted to another client, and will reject the open request for the second client

Answer»

HDFS supports exclusive writes only.

When the first client contacts the name-node to open the file for writing, the name-node grants a lease to the client to create this file. When the second client tries to open the same file for writing, the name-node will see that the lease for the file is already granted to another client, and will reject the open request for the second client

Discussion

No Comment Found

Related InterviewSolutions

Why is Checkpointing Important in Hadoop?
Can Hadoop handle streaming data?
What is speculative execution in Hadoop?
What are Problems with small files and HDFS?
Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?
Consider case scenario: In M/R system, - HDFS block size is 64 MB- Input format is FileInputFormat– We have 3 files of size 64K, 65Mb and 127MbHow many input splits will be made by Hadoop framework?
What is a Combiner?
What does "file could only be replicated to 0 nodes, instead of 1" mean?
What happens when two clients try to write into the same HDFS file?
Can we search for files using wildcards?

What happens when two clients try to write into the same HDFS file?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment