Managing the HDFS cluster
The health of HDFS is critical for a Hadoop-based Big Data platform. HDFS problems can negatively affect the efficiency of the cluster. Even worse, it can make the cluster not function properly. For example, DataNode's unavailability caused by network segmentation can lead to some under-replicated data blocks. When this happens, HDFS will automatically replicate those data blocks, which will bring a lot of overhead to the cluster and cause the cluster to be too unstable to be available for use. In this recipe, we will show commands to manage an HDFS cluster.
Before getting started, we assume that our Hadoop cluster has been properly configured and all the daemons are running without any problems.
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