PI54086: ESI caching errors

Fixes are available

APAR status

Closed as program error.

Error description

The webserver plugin's ESI code buffers responses that should
not be cached which can cause excessive memory usage.

Local fix

```
Disable ESI caching
```

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server web        *
*                  server plugin Edge Side Include (ESI)       *
*                  users                                       *
****************************************************************
* PROBLEM DESCRIPTION: ESI caching inefficiencies could lead   *
*                      to out of memory errors.                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
If the response indicated "no-cache" or "no-store" plugins's
ESI caching would perform the reads and buffer the data until
it has the complete response to send to the client.

Problem conclusion

Several corrections were made. If the response indicates
no-store or no-cache in the Surrogate-Control header and
indicates that there are no embedded ESI tags, then ESI
processing will stop and regular processing will take place
to forward the response to the client.  Plugins prior
behavior would always check the response for embedded content
regardless of if the header indicated to search for embedded
content or not. If the request was too large to
cache, plugin would continue to allocate memory and try
to cache instead of passing the response back to client.

On V7, the old bypass behavior remains the default.
The new by-pass ESI function needs to be enabled on v7 using the
plugin custom property of ESIOldByPass with a value of false.

On V8 and later, the new bypass behavior is the default.
If the old by-pass behavior is desired the plugin custom
property ESIOldByPass needs to be set to true.

The fix for this APAR is currently targeted for inclusion in
fix packs 7.0.0.41, 8.0.0.13, and 8.5.5.10.  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
PI54086
Reported component name
WEBSPHERE APP S
Reported component ID
5724J0800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-12-14
Closed date
2016-01-08
Last modified date
2017-08-25

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
WEBSPHERE APP S
Fixed component ID
5724J0800

Applicable component levels

R700 PSY
UP
R800 PSY
UP
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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 April 2022

Tips

PI54086: ESI caching errors

Fixes are available

Subscribe

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

R700 PSY

R800 PSY

R850 PSY

Document Information

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