August 2012
Intermediate to advanced
332 pages
7h 3m
English
As HBase runs within HDFS, in addition to taking care of the HBase cluster, it is also important to keep your HDFS running on a healthy status. NameNode is the most important component in an HDFS cluster. A NameNode crash makes the entire HDFS cluster inaccessible. The metadata of an HDFS cluster, including the filesystem image and edit log, is managed by NameNode.
We need to protect our NameNode metadata for two situations:
For the first situation, we can set up NameNode to write its metadata to its local disk, along with an NFS mount. As described in the Setting up multiple, highly available (HA) masters recipe, in Chapter 1, Setting Up HBase Cluster ...