From my viewpoint the main issue I see is Hadoop’s main focus on “High Reliability” not really “High Availability” … If Isilon is acting as a middle man for HDFS and making the Hadoop’s NameNode think it’s written 3x replicas and there is only one that actually exists on the Isilon cluster … then it possibly removes the overall reliability of Hadoop as a whole for the following reasons that I can see:
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Opinion: Native HDFS on EMC Isilon
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From my viewpoint the main issue I see is Hadoop’s main focus on “High Reliability” not really “High Availability” … If Isilon is acting as a middle man for HDFS and making the Hadoop’s NameNode think it’s written 3x replicas and there is only one that actually exists on the Isilon cluster … then it possibly removes the overall reliability of Hadoop as a whole for the following reasons that I can see: