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hadoophdfs
Shadocko
Shadocko

Reputation: 1216

HDFS single node replication

When running a single-node HDFS cluster (or pseudo-distributed mode) with several data directories on separate physical hard disk drives, is it possible to have block replication in case of a disk failure?

I understand that single-node installations are atypical but still would like to know. Everything I read only dealt with node failures but I could find nothing about disk failures in single-node scenarios.

Note : I'm only interested in the possibility of data loss here, not in the availability of the so-called "cluster".

Upvotes: 3

Views: 530

Answers (1)

Ali
Ali

Reputation: 1635

Node failure can be caused just by a disk failure, so every disk failure will cause a node failure which means that the data will be lost if you have a single disk and single node. But if you have two disks on a node you can have two DataNodes on that machine each with a separate disk and then you can have replication. In this case disk failure will not cause a node failure necessarily.

Upvotes: 2

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