Saturday, November 25, 2017

HBase question dumps

Collection of random questions about HBase, for my own reference:


  • Why prefer JBOD over RAID for slave nodes? is it b/c of the underlying assumption of using HDFS? how does HDFS replicates blocks? is it possible that replication fails before a block get replicated? How to recover from such failure, from HDFS standpoint of view?
  • Not directly related to HBase, but what are the pros and cons of different fs mentioned in Chapter 2? (ext3,4, XFS, ZFS....)
  • RPC call between HBase and HDFS, assume version matches, performance concerns? 
  • Best practice on how to avoid memory swap, especially on slaveNode.

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