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MapReduce >> mail # user >> hdfs 0.22 -> 0.20.204


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hdfs 0.22 -> 0.20.204
I want to try hadoop 0.22. Its possible to downgrade it later without
loosing HDFS content (namenode, datanodes)?
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB