Restart Servers and Redistribute HDFS Blocks

Log on to SAS Visual Analytics Administrator and perform the following steps:

Select LASRMonitor Resources and sure that the additional machines appear in the Real-Time View.
Select LASRManage Servers and start each of the servers.
Select ToolsExplore HDFS and review the block distribution.

Any tables that are loaded from HDFS cannot initially use the additional hardware because the blocks have not been replicated to the additional machines. Within SAS Visual Analytic Administrator, you can view the block distribution from the HDFS tab to confirm that blocks are on the original machines only.

Hadoop includes a balancer process that can move blocks to under-utilized machines. The process is intentionally slow so that resource consumption is low and so that it does not interfere with other tasks on the cluster. To begin the balancing process:

./hadoop-daemon.sh start balancer

As an alternative, if adding the data to HDFS again is possible, then you can delete files with SAS Visual Analytics Administrator and then add them back.