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From Ruilong Huo <r...@pivotal.io>
Subject Turning off DoS protection in hawq
Date Sun, 11 Dec 2016 00:38:54 GMT
Hi hawq community,

Anyone know that why we turn off DoS protection in hawq by setting
net.ipv4.tcp_syncookies to off in /etc/sysctl.conf? Any other reason from
hawq perspective other than below two more from operating system
perspective?

1) increase the number of concurrent tcp clients

2) reduce cpu overhead for creating and processing the syncookies. Though
the overhead is tiny

BTW: HAWQ turn off DoS protection
<http://hdb.docs.pivotal.io/210/hdb/install/install-cli.html> while
Greenplum Database enable DoS protection
<http://gpdb.docs.pivotal.io/4320/install_guide/prep_os_install_gpdb.html> by
default.

Best regards,
Ruilong Huo

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