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Informix - Problem description

Problem IT34191 Status: Closed

LOG RECOVERY CAN HANG WHEN SKIPPING LOG RECORDS OLDER THAN THE DBSPACE
BEING RECOVERED

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
HDR or RSS secondary servers can hang soon after newly being
instantiated, with all active wreplay_# threads hung in
recvr_txatt() function, if dbspaces got restored from backups
newer than related log records being recovered (or actually
skipped).

Typical picture would be:

onstat -g laq showing some of the wreplay threads with non-zero
Queue Size and picture not changing over time,
e.g.

Log Apply Info:
Thread         Queue    Total      Avg
                Size   Queued    Depth
wreplay_1           0        0     0.00
wreplay_2           0        0     0.00
wreplay_3          84      107    33.58
wreplay_4           0       79     1.03
wreplay_5           0       79     1.00
wreplay_6           0        0     0.00
wreplay_7           0       25     1.00
wreplay_8           0      104     1.00
wreplay_9           0      111     1.00
wreplay_10          0      158     1.01
wreplay_11        159      160    79.51
wreplay_12          0        0     0.00
wreplay_13          0        0     0.00
wreplay_14          0        0     0.00
wreplay_15          0        0     0.00
wreplay_16          0       79     1.00
wreplay_17          7        7     4.00
wreplay_18          0        0     0.00
wreplay_19          0        0     0.00
wreplay_20          0        0     0.00

and exatly those wreplay threads shown in status "yield forever"
(all others in "cond wait  ReplayTime") and showing this stack:

 (oninit)yield_processor_mvp
 (oninit)mt_yield
 (oninit)recvr_txatt
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC5.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 14.10.xC5.                         *
****************************************************************
Local Fix:
Switch back to pre-14.10 log recovery, at least temporarily:
onconfig CDR_FEATURES    CLASSIC_REPLAY
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
11.09.2020
09.12.2020
09.12.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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