Re: hanging httpd processes.

[Amar Tumballi <atumball@xxxxxxxxxx>]

Hi Alvin,

Thanks for the dump output. It helped a bit.

For now, recommend turning off open-behind and read-ahead performance translators for you to get rid of this situation, As I noticed hung FLUSH operations from these translators.

-Amar

On Wed, Mar 29, 2017 at 6:56 AM, Alvin Starr <alvin@xxxxxxxxxx> wrote:

We are running gluster 3.8.9-1 on Centos 7.3.1611 for the servers and on the clients 3.7.11-2 on Centos 6.8

We are seeing httpd processes hang in fuse_request_send or sync_page.

These calls are from PHP 5.3.3-48 scripts

I am attaching  a tgz file that contains the process dump from glusterfsd and the hung pids along with the offending pid's stacks from /proc/{pid}/stack.

This has been a low level annoyance for a while but it has become a much bigger issue because the number of hung processes went from a few a week to a few hundred a day.


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Amar Tumballi (amarts)

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