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https://issues.apache.org/jira/browse/HADOOP-16504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HADOOP-16504.
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Resolution: Fixed
Fix Version/s: 3.3.0
Thanks [~leosun08]!
> 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
> Fix For: 3.3.0
>
> Attachments: HADOOP-16504.000.patch, HADOOP-16504.001.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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