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In this patch we add the "ERASURE_CODING" enviornment variable. If we enable it, a cluster with 5 data nodes will be created during data loading and HDFS will be started with erasure coding enabled. Testing: I ran the core build, and verified that erasure coding gets enabled in HDFS. Many of our EE tests failed however. Cherry-picks: not for 2.x Change-Id: I397aed491354be21b0a8441ca671232dca25146c Reviewed-on: http://gerrit.cloudera.org:8080/10275 Reviewed-by: Taras Bobrovytsky <tbobrovytsky@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>