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https://issues.apache.org/jira/browse/HADOOP-16504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905755#comment-16905755
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Wei-Chiu Chuang commented on HADOOP-16504:
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Looks reasonable to me. We even have customers increasing this number to 2k or
even 16k.
The only potential downside is it could result in more memory usage. Not sure
how much it could be but I don't think that's a concern for typical deployments.
I'd like to wait for a day or two for any one else to have a chance to assess &
comment before I commit this patch.
> 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, 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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