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Due to KUDU-1973 kudu-tservers produce high CPU consumption (see also KUDU-3134) when there is a high number of table replicas. This means that in the Impala dev environment the CPU consumption can be around 15-20% per kudu-tserver (there are 3 kudu-tservers) when all the Kudu tables are loaded. Setting the value to 3 seconds lowers CPU usage to ~5% per kudu-terver. Testing: * ran exhaustive tests Change-Id: Ieb4de56540f5a7dc860bf6e27d9a5c0e4f4b3d26 Reviewed-on: http://gerrit.cloudera.org:8080/18290 Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>