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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/08/19 07:51:27 UTC

[jira] [Updated] (HBASE-4220) Lots of DNS queries from client

     [ https://issues.apache.org/jira/browse/HBASE-4220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-4220:
-------------------------

    Attachment: 4220.txt

Rather than cache a HSA, I just looked at who uses getServerAddress and as it happens, no one needs to be using getServerAddress.  Only in one case does it make a difference in that the HSA.toString that was being used now is hostname+port only whereas it used be hostname/ip+port; i.e. InetAddress.toString()+port.  Shouldn't matter.

> Lots of DNS queries from client
> -------------------------------
>
>                 Key: HBASE-4220
>                 URL: https://issues.apache.org/jira/browse/HBASE-4220
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 4220.txt
>
>
> In running a YCSB workload, I managed to DDOS a DNS server since it seems to be flooding lots of DNS requests. Installing nscd on the client machines improved throughput by a factor of 6 and stopped killing the server. These are long-running clients, so it's not clear why we do so many lookups.

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