[jira] [Created] (AMBARI-21254) Alert if linux kernel changes are not in place for LLAP

["Prasanth Jayachandran (JIRA)" <ji...@apache.org>]

Prasanth Jayachandran created AMBARI-21254:
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             Summary: Alert if linux kernel changes are not in place for LLAP
                 Key: AMBARI-21254
                 URL: https://issues.apache.org/jira/browse/AMBARI-21254
             Project: Ambari
          Issue Type: Bug
          Components:  HiveServer2, Metastore, and Client Heap Sizes to Smart Configs
            Reporter: Prasanth Jayachandran


Following changes were made per [~rbalamohan]'s recommendation (count has been bumped up from 8K to 16K for somaxconn and backlog).
{code}
sudo sysctl -w net.core.somaxconn=16384 
sudo sysctl -w net.core.netdev_max_backlog=16384
sudo sysctl -w net.ipv4.ip_local_port_range="4096    60999"
sudo sysctl -w net.ipv4.tcp_fin_timeout=10
sudo sysctl -w vm.swappiness=0
sudo sysctl -w vm.dirty_ratio=80
{code}

Since these configs has significant impact on shuffle, should this be enforced/alerted somehow to the user. SmartSense has some rules for it. But Microsoft's cluster did not have SmartSense.




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