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DB2 - Problembeschreibung

Problem IC94869 Status: Geschlossen

COORDINATOR AGENT MAY HANG WITH PENDING REMOTE REQUEST STATUS DUE TO
DISCARDED BUFFER.

Produkt:
DB2 FOR LUW / DB2FORLUW / A50 - DB2
Problembeschreibung:
The FCM buffer discarded message can be seen in db2diag.log on a 
remote partition. 
 
2013-08-05-01.09.07.477149+480 I16501733A701      LEVEL: Error 
PID     : 2294174              TID  : 1543        PROC : db2sysc 
10 
INSTANCE: db2inst1             NODE : 010 
EDUID   : 1543                 EDUNAME: db2fcmr 10 
FUNCTION: DB2 UDB, fast comm manager, 
sqkfFastCommManager::RouteInboundBuffer, probe:30 
DATA #1 : <preformatted> 
rc = 0x0; buffer addr: 7800000a3a39080 
buffer info: channel ID=478015836, sender node=0, conduit ID=0, 
sequenceNo=4294967295, sessionId=0, priority=0, 
msgFlags=0x30009, 
msgType=1 
app_hdl=0-18506, app_stamp=594176, sourceNode=0, idtype=1, 
idflags=0, bdsCounter=28, nestedCounter=0 
(BDS) subtaskId=33, sendNode=0, intFlags=0x0, bdsFlags=0x2 
(BQS) counter=33, node=0 
 
DB2 has an internal unique counter called app_stamp based off 
epoch time for each incarnation of an app-handle. But due to the 
way DB2 calculates this unique number, it can wrap. Because the 
unique identifier wraps, it caused a problem in the logic of 
our code that ultimately lead to a buffer being discarded, and 
an application being hung. 
 
Note : 
- On DB2 Version 9.7 or higher, EDUNAME is db2pdbc and the 
FUNCTION is sqkfFastCommManager::DeliverBufferToTargetChannel, 
probe:30 
- This issue only applies to the DB2&#65449; partitioned database 
environment. 
- This issue also impacts pureScale instance.
Problem-Zusammenfassung:
The FCM buffer discarded message can be seen in db2diag.log on a 
remote partition. 
 
2013-08-05-01.09.07.477149+480 I16501733A701      LEVEL: Error 
PID     : 2294174              TID  : 1543        PROC : db2sysc 
10 
INSTANCE: db2inst1             NODE : 010 
EDUID   : 1543                 EDUNAME: db2fcmr 10 
FUNCTION: DB2 UDB, fast comm manager, 
sqkfFastCommManager::RouteInboundBuffer, probe:30 
DATA #1 : <preformatted> 
rc = 0x0; buffer addr: 7800000a3a39080 
buffer info: channel ID=478015836, sender node=0, conduit ID=0, 
sequenceNo=4294967295, sessionId=0, priority=0, 
msgFlags=0x30009, 
msgType=1 
app_hdl=0-18506, app_stamp=594176, sourceNode=0, idtype=1, 
idflags=0, bdsCounter=28, nestedCounter=0 
(BDS) subtaskId=33, sendNode=0, intFlags=0x0, bdsFlags=0x2 
(BQS) counter=33, node=0 
 
DB2 has an internal unique counter called app_stamp based off 
epoch time for each incarnation of an app-handle. But due to the 
way DB2 calculates this unique number, it can wrap. Because the 
unique identifier wraps, it caused a problem in the logic of 
our code that ultimately lead to a buffer being discarded, and 
an application being hung. 
 
Note : 
- On DB2 Version 9.7 or higher, EDUNAME is db2pdbc and the 
FUNCTION is sqkfFastCommManager::DeliverBufferToTargetChannel, 
probe:30 
 
- This issue only applies to the DB2&#169; partitioned database 
environment. 
- This issue also impacts pureScale instance.
Local-Fix:
Recycle the db2 instance.
verfügbare FixPacks:
DB2 Version 10.5 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 10.5 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Cancun Release 10.5.0.4 (also known as Fix Pack 4) for Linux, UNIX, and Windows
DB2 Version 10.5 Fix Pack 9 for Linux, UNIX, and Windows

Lösung
First fixed in DB2 Version 10.5 Fix Pack 3.
Workaround
Recycle the db2 instance.
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
13.08.2013
06.05.2014
06.05.2014
Problem behoben ab folgender Versionen (IBM BugInfos)
Problem behoben lt. FixList in der Version
10.5.0.3 FixList
10.5.0.3 FixList