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OAM Node Fails Intermittently, When Test Couldn't Connect To The Java Process Anymore (Doc ID 2346264.1)

Last updated on JANUARY 16, 2018

Applies to:

Oracle Access Manager - Version 11.1.2.3.161018 and later
Information in this document applies to any platform.

Symptoms

A)
high CPU on OAM node 2

steps:
1. Users report problems with error: 'the webgate plug-in is unable to contact any access server"
2. The WebTiers and WebGates are running fine
3. The OAM cluster still responds
4. The second OAM node is consuming high CPU:
ora$:/opt/oracle/Middleware/config/domains/IAMAccessDomain/servers/wls_oam2/logs $ top
top - 15:25:38 up 59 days, 5:31, 3 users, load average: 3.93, 4.04, 4.03
Tasks: 250 total, 1 running, 249 sleeping, 0 stopped, 0 zombie
Cpu(s): 86.9%us, 4.7%sy, 0.0%ni, 7.7%id, 0.1%wa, 0.0%hi, 0.6%si, 0.0%st
Mem: 16317908k total, 16014116k used, 303792k free, 347576k buffers
Swap: 16777212k total, 209396k used, 16567816k free, 3926604k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 55820 ora 20 0 5399m 2.2g 7964 S 331.0 14.4 1906:51 java
5. Both nodes report issues with the Oracle Coehernce cluster timing out.
6. Only a restart of the node solves the issue.

B) sometime OAM node 2 managed server just stopped responding, when test, I couldn't connect to the java process anymore, either. tried jmap, jstack, jvisualvm, jcm, jconsole.

Changes

 Issue observed when load on servers is higher.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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