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https://issues.apache.org/jira/browse/HADOOP-16504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904500#comment-16904500
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Wei-Chiu Chuang commented on HADOOP-16504:
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Hi [~leosun08] thanks for raising the issue.
Would you please describe what's the intended use of this change? Is it meant
for NameNode, or other services? What's the impact of this change? Like, does
it reduce client connection timeout when NN is busy?
Thanks
> Increase ipc.server.listen.queue.size default from 128 to 256
> -------------------------------------------------------------
>
> Key: HADOOP-16504
> URL: https://issues.apache.org/jira/browse/HADOOP-16504
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Lisheng Sun
> Assignee: Lisheng Sun
> Priority: Major
> Attachments: HADOOP-16504.000.patch
>
>
> Because ipc.server.listen.queue.size default value is too small, TCP's
> ListenDrop indicator along with the rpc request large.
> The upper limit of the system's semi-join queue is 65636 and maximum number
> of fully connected queues is 1024.
> {code:java}
> [work@c3-hadoop-srv-talos27 ~]$ cat /proc/sys/net/ipv4/tcp_max_syn_backlog
> 65536
> [work@c3-hadoop-srv-talos27 ~]$ cat /proc/sys/net/core/somaxconn
> 1024
> {code}
> I think this default value should be adjusted.
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