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https://issues.apache.org/jira/browse/AMBARI-16295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated AMBARI-16295:
-----------------------------------
Affects Version/s: 2.4.0
> Protecting NameNode from too many connections
> ---------------------------------------------
>
> Key: AMBARI-16295
> URL: https://issues.apache.org/jira/browse/AMBARI-16295
> Project: Ambari
> Issue Type: Improvement
> Affects Versions: 2.4.0
> Reporter: Mingliang Liu
>
> On the HDFS name node (NN) there is a system {{ulimit}} setting for the
> maximum open files, which is generally large enough. In extreme cases (large
> cluster with burst loads) chances are there are too many connections more
> than the limit. In this case, the NN will fail to write edit log to the
> journal (too many opened files), and crash ultimately.
> It will be very helpful if the Ambari enforces another guard with iptable
> (firewall) rules. Iptables allows rate limiting by connections/sec as well as
> setting limits on the open connections to a specific port. The latter can be
> an aggregate limit or a per remote IP address limit.
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