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https://issues.jboss.org/browse/MODCLUSTER-536?page=com.atlassian.jira.pl...
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Wayne Wang edited comment on MODCLUSTER-536 at 8/31/16 11:35 AM:
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Additional information:
I could shut down the instance in two different ways during load tests
(1) After Jmeter send button is back (all requests were sent to a specific wildfly
instance for processing)
(2) Before Jmeter send button is back, and the rest of requests need to be routed to the
soon-to-be active wildfly instance that is currently inactive.
I found one round of load test with the second way of shutting down the wildfly instance
will cause the "Too many open files" issue in the next round of load test. If I
use the first way of shutting down the wildfly instance, it needs three times of load
tests to replicate the issue.
So it looks like shutting down a wildfly instance may be one potential cause of the issue.
In addition, the activation of the standby instance takes some time, and the rest of
requests will go nowhere during that period of time until the standby instance becomes
active. I am not sure if this can bring additional issue
was (Author: wwang2016):
Additional information:
I could shut down the instance in two different ways during load tests
(1) After Jmeter send button is back (all requests were sent to a specific wildfly
instance for processing)
(2) Before Jmeter send button is back, and the rest of requests need to be routed to the
soon-to-be active wildfly instance that is currently inactive.
I found one round of load test with the second way of shutting down the wildfly instance
will cause the "Too many open files" issue in the next round of load test. If I
use the first way of shutting down the wildfly instance, it needs three times of load
tests to replicate the issue.
List of open files grows steadily during load test through
mod_cluster
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Key: MODCLUSTER-536
URL:
https://issues.jboss.org/browse/MODCLUSTER-536
Project: mod_cluster
Issue Type: Bug
Components: Core & Container Integration (Java)
Affects Versions: 1.3.1.Final
Environment: Wildfly10.0.0.Final
mod_cluster-1.3.1.Final-linux2-x64-ssl
CentOS7 (virtualbox)
Reporter: Wayne Wang
Assignee: Michal Karm Babacek
Attachments: error_log, httpd-mpm.conf, httpd.conf, server.log,
standalone-full-ha-snippet.xml
I was able to configure wildfly 10 modcluster to work with Apache mod_cluster (1.3.1).
However, when I was doing a load test, I found out that the test through web server
eventually caused error in wildfly instance and I also saw error log in Apache web server
The obvious error in wildfly instance is the so-called "java.net.SocketException:
Too many files open". When I used the command lsop -u | grep TCP | wc -l, I can see
the number grew steadily until the wildfly instance reported the error. This was when I
sent requests through web server.
However, when I sent the requests through wildfly instance (app server) directly, the
number did not grow, and the app server can take a lot heavier load without this issue.
The issue did not happen until many rounds of load tests were executed through web
server. If I restart the web server, everything is working fine until I execute many
rounds of load tests again
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