Scenario 1: There was data, the logs say Namenode not formatted, the dfs.data.dir (check your config to see where it is) is empty Cause: The data was emptied out of your namenode directory. Things to try (in order): FSCK (see scenario 2 below) recover the namenode hadoop namenode start -recover If the output says some… Continue reading How to recover a corrupt HDFS namenode
Category: Uncategorized
Prescriptive Analytics And Big Data: Next Big Thing
Predictive analytics tells you what will happen; prescriptive analytics tells you what to do about it. Decision Support and Analytics has traditionally addressed Descriptive Analytics and Predictive Analytics. Jeff Bertolucci highlights this domain founded on the methods of Operations Research and called by IBM, “the final phase” in business analytics. Link: Prescriptive Analytics And Big Data:… Continue reading Prescriptive Analytics And Big Data: Next Big Thing