[HADOOP-16504] Increase ipc.server.listen.queue.size default from 128 to 256

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Assignee: Lisheng Sun
• Reporter: Lisheng Sun
• Created: 10/Aug/19 16:46
• Updated: 02/Oct/19 17:16
• Resolved: 15/Aug/19 22:21

Description

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.

[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

I think this default value should be adjusted.

Issue Links

• relates to: HDFS-13010 DataNode: Listen queue is always 128