[Glass] [3.1.0.4] Page Cache Fault during Backup

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[Glass] [3.1.0.4] Page Cache Fault during Backup

Ken Treis
When running a Smalltalk full backup, we get these page cache faults from time to time. They really scared me at first, but the backup runs without fault if we run it again later. Is this something to worry about? And is the backup invalid if this happens?
--
Ken Treis
Miriam Technologies, Inc.
(866) 652-2040 x221

Begin forwarded message:

From: root@www (Cron Daemon)
Subject: Cron <gsadmin@www> /opt/gemstone/product/seaside/bin/runBackup-smalltalk
Date: August 24, 2013 11:56:01 PM PDT

Performing backup for stone: seaside
topaz> topaz> topaz> topaz> topaz> topaz> successful login
topaz 1> topaz 1> 2013-08-24T23:45:03.35230088233948-07:00
Performing Smalltalk full backup...


*************** Page Cache Fault ***************
 occurred at /export/jupiter3/users/buildgss/gs64/3101/build31024/src/pagecache.hc: 2504
 message is: Page header fault, expected page 2027725 frame page 2027725 , expected kind 4, found kind 3


Cache coherency page 2027725 pageHdrPtr 0x0x7fe909938000
PageHdr fields:
 pageKind 3, pageDirty 0, netStatus 0, inSharedCache 1
 pageId 2027725, aioState 0, flushedRemote 0
 sessionId 10, beginId (3542175, 0(freeFrameId) )
 privatePinned 0 bytesUsed 208, spare1 0, spare2 0
SharedCache frame 13086
 frameAge 46
 frameLock.pageReferenceCount 1
Frame History Information:
 previousPageId 0, newPageId 2027725
 procTableSlot 37, sessionId 22, readIdNum 20
 shrTimeNow 1377413701   08/24/2013 23:55:01 PDT
********************************************************

Workspace beginId = (3542299 24) sessionId 8
********************************************************
2013-08-24T23:55:59.79580307006836-07:00
...backup status: success
true
topaz 1> topaz 1> Logging out session 1.


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Re: [Glass] [3.1.0.4] Page Cache Fault during Backup

Dale Henrichs-3
Ken,

It turns out that this is likely to be a bug, that we just discovered ourselves (internal bug 43261). The bug is in the page reclaim and the multithreaded backup code and our recommendation is that you turn off all reclaim gems before running a backup. If this error occurs the backup should be discarded.

Dale


From: "Ken Treis" <[hidden email]>
To: [hidden email]
Sent: Monday, September 2, 2013 8:41:58 AM
Subject: [Glass] [3.1.0.4] Page Cache Fault during Backup

When running a Smalltalk full backup, we get these page cache faults from time to time. They really scared me at first, but the backup runs without fault if we run it again later. Is this something to worry about? And is the backup invalid if this happens?
--
Ken Treis
Miriam Technologies, Inc.
(866) 652-2040 x221

Begin forwarded message:

From: root@www (Cron Daemon)
Subject: Cron <gsadmin@www> /opt/gemstone/product/seaside/bin/runBackup-smalltalk
Date: August 24, 2013 11:56:01 PM PDT

Performing backup for stone: seaside
topaz> topaz> topaz> topaz> topaz> topaz> successful login
topaz 1> topaz 1> 2013-08-24T23:45:03.35230088233948-07:00
Performing Smalltalk full backup...


*************** Page Cache Fault ***************
 occurred at /export/jupiter3/users/buildgss/gs64/3101/build31024/src/pagecache.hc: 2504
 message is: Page header fault, expected page 2027725 frame page 2027725 , expected kind 4, found kind 3


Cache coherency page 2027725 pageHdrPtr 0x0x7fe909938000
PageHdr fields:
 pageKind 3, pageDirty 0, netStatus 0, inSharedCache 1
 pageId 2027725, aioState 0, flushedRemote 0
 sessionId 10, beginId (3542175, 0(freeFrameId) )
 privatePinned 0 bytesUsed 208, spare1 0, spare2 0
SharedCache frame 13086
 frameAge 46
 frameLock.pageReferenceCount 1
Frame History Information:
 previousPageId 0, newPageId 2027725
 procTableSlot 37, sessionId 22, readIdNum 20
 shrTimeNow 1377413701   08/24/2013 23:55:01 PDT
********************************************************

Workspace beginId = (3542299 24) sessionId 8
********************************************************
2013-08-24T23:55:59.79580307006836-07:00
...backup status: success
true
topaz 1> topaz 1> Logging out session 1.


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[hidden email]
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