[Glass] [3.1.0.4] Page Cache Fault during Backup

Mon Sep 2 14:17:30 PDT 2013

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 

----- Original Message -----

| From: "Ken Treis" <ken at miriamtech.com>
| To: glass at lists.gemtalksystems.com
| 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 at www (Cron Daemon)
| 

| | Subject: Cron <gsadmin at www>
| | /opt/gemstone/product/seaside/bin/runBackup-smalltalk
| 

| | Date: August 24, 2013 11:56:01 PM PDT
| 

| | To: server at miriamtech.com
| 

| | 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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| Glass at lists.gemtalksystems.com
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