For HDFS: the Namenode is a single point of failure, so try to employ very reliable hardware for it, with RAID storage or some other redundant storage solution. However, there have been some interesting alternatives to backing up the Namenode, such as the Backup Node and AvatarNode. HBase Interview Questions. There are two types of compaction. Major and Minor compaction. In minor compaction, the adjacent small HFiles are merged to create a single HFile without removing the deleted HFiles. Files to be merged are chosen randomly. In Major compaction, all the HFiles of a column are emerged and a single HFiles is created. (7 replies) How does one deal with the fact that HBase has a single point of failure.. namely the namenode. What steps can be taken to eliminate and/or minimize the impact of a namenode failure? What can a situation where reliability is of utmost importance should one choose an alternative technology.. ie Cassandra? Thanks.
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