PI66698: Hang with high CPU occurs during rollout in certain situations

Fixes are available

APAR status

Closed as program error.

Error description

Hang occurs during rollout during certain situations and
high
CPU.

gs : group size
nj : number of JVM
ng : number of groups

calculation of the number of groups
ng = (nj + (gs / 2)) / gs

In the case of "(ng * gs) <  nj", the hung thread issue
happens.

In the case, the group size is 5.

ng = (12 + (5 / 2)) / 5 = (12 + 2) / 5 = 14 / 5 = 2

then

(ng * gs) < nj becomes 2 * 5 < 12

Local fix

```
n/a
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server WAS ND edition- Virtual              *
*                  Enterprise/IM Component                     *
****************************************************************
* PROBLEM DESCRIPTION: The application edition rollout         *
*                      operation causes high CPU usage in some *
*                      situations.                             *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
There was an issue in the calculation of the number of groups
and the number of the servers in each group.  It caused the
infinite loop and timeout.

Problem conclusion

There was an issue in the calculation of the number of groups
and the number of the servers in each group.  It caused the
infinite loop and timeout.  The code has been corrected.

The fix for this APAR is currently targeted for inclusion in fix
pack 8.5.5.11.  Please refer to the Recommended Updates page for
delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI66698
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
850
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-07-28
Closed date
2016-09-26
Last modified date
2016-09-26

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R850 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI66698: Hang with high CPU occurs during rollout in certain situations

Fixes are available

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APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R850 PSY

Document Information

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