PI70900: Events get lost when the logstashCollector config gets updated

Fixes are available

APAR status

Closed as program error.

Error description

Collector manager uses internal buffers to store events.
These buffers are discarded when the last handler goes away.
This behavior does not doesn't work well for certain
situations. Example below.

1) We have one handler (logmet/logstash collector feature).
2) User updates the config for this feature, example bad
port to a valid port.
3) Logmet/Logstash collector calls an unsubscribe &
subscribe on the sources on config update.
4) Unsubscribe will discard the existing buffers and a
subscribe operation will result in new buffers getting
allocated.
5) End result is we lose events in the old buffer.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty - Perf Monitoring Tools      *
****************************************************************
* PROBLEM DESCRIPTION: Some events get lost when the           *
*                      logstashCollector configuration gets    *
*                      updated                                 *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Collector manager uses internal buffers to store events. These
buffers are discarded when the last handler goes away. This
behavior is not doesn't work well for certain situations.
Example below.

1) We have one logmet/logstash collector feature.
2) User updates the config for this feature, example bad port to
a valid port.
3) Logmet/Logstash collector calls a unsubscribe & subscribe on
the sources on config update.
4) Unsubscribe will discard the existing buffers and a subscribe
operation will result in new buffers getting allocated.
5) End result is that we lose events in the old buffer.

Problem conclusion

Program change: We now maintain the buffer contents across
configuration changes as long as the source is present both
before and after the change. If the source is removed, the
configuration saved, and then the source is added again at a
later time, the events in between will still be lost, as
intended.

The fix for this APAR is currently targeted for inclusion in fix
pack 16.0.0.4.  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
PI70900
Reported component name
LIBERTY PROFILE
Reported component ID
5724J0814
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-10-18
Closed date
2016-10-25
Last modified date
2016-10-25

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
LIBERTY PROFILE
Fixed component ID
5724J0814

Applicable component levels

RCD0 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":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

PI70900: Events get lost when the logstashCollector config gets updated

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

RCD0 PSY

Document Information

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