Jan 11 in Big Data | Hadoop
Q: What would happen if NameNode crashes in a HDFS cluster?

1 Answer

Jan 11

There is only one NameNode in a HDFS cluster. This node maintains metadata about DataNodes. Since there is only one NameNode, it is the single point of failure in a HDFS cluster. When NameNode crashes, system may become unavailable.

We can specify a secondary NameNode in HDFS cluster. The secondary


NameNode takes the periodic checkpoints of the file system in HDFS. But it is not the backup of NameNode. We can use it to recreate the NameNode and restart it in case of a crash.

Click here to read more about Loan/Mortgage
Click here to read more about Insurance

Related questions

Jan 11 in Big Data | Hadoop
Oct 28 in Hadoop
Aug 22, 2019 in Selenium