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From "Mingliang Liu (JIRA)" <>
Subject [jira] [Updated] (AMBARI-16295) Protecting NameNode from too many connections
Date Sat, 07 May 2016 00:37:12 GMT


Mingliang Liu updated AMBARI-16295:
    Component/s: ambari-admin

> Protecting NameNode from too many connections
> ---------------------------------------------
>                 Key: AMBARI-16295
>                 URL:
>             Project: Ambari
>          Issue Type: Improvement
>          Components: ambari-admin
>    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

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