RepoMirrors
/
mars
mirror of https://github.com/schoebel/mars
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

marsadm: disallow ordinary switching when logfiles are damaged 

Only primary --force should be possible in such a (rare) case.
This commit is contained in:
Thomas Schoebel-Theuer 2016-01-14 15:31:01 +01:00 committed by Thomas Schoebel-Theuer
parent d67336420d
commit cc1d786654
2 changed files with 90 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

133
docu/mars-manual.lyx
View File

@ -1,5 +1,5 @@
#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
#LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 474
\begin_document
\begin_header
\textclass scrreprt
@ -22,13 +22,13 @@ fixltx2e
\font_roman default
\font_sans default
\font_typewriter default
\font_math auto
\font_default_family rmdefault
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
@ -50,15 +50,24 @@ fixltx2e
\pdf_pdfusetitle true
\papersize a4paper
\use_geometry true
\use_amsmath 1
\use_esint 1
\use_mhchem 1
\use_mathdots 1
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
@ -570,9 +579,9 @@ The following table is a short guide to the most important cases where the
\align center
\begin_inset Tabular
<lyxtabular version="3" rows="6" columns="2">
<features tabularvalignment="middle">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top" width="0">
<features rotate="0" tabularvalignment="middle">
<column alignment="center" valignment="top">
<column alignment="center" valignment="top">
<row>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
\begin_inset Text
@ -6904,10 +6913,10 @@ should
\begin_inset Tabular
<lyxtabular version="3" rows="3" columns="3">
<features tabularvalignment="middle">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top" width="0">
<features rotate="0" tabularvalignment="middle">
<column alignment="center" valignment="top">
<column alignment="center" valignment="top">
<column alignment="center" valignment="top">
<row>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
\begin_inset Text
@ -7699,7 +7708,7 @@ status open
\end_layout
\begin_layout Plain Layout
\begin_inset Caption
\begin_inset Caption Standard
\begin_layout Plain Layout
overview on amounts / cursors
@ -11943,7 +11952,7 @@ remembers
\size tiny
\begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3">
<features tabularvalignment="middle">
<features rotate="0" tabularvalignment="middle">
<column alignment="left" valignment="top" width="0pt">
<column alignment="left" valignment="top" width="0pt">
<column alignment="left" valignment="top" width="0pt">
@ -12191,7 +12200,7 @@ If you intentionally want to switch over (and to produce a split brain as
\size tiny
\begin_inset Tabular
<lyxtabular version="3" rows="9" columns="3">
<features tabularvalignment="middle">
<features rotate="0" tabularvalignment="middle">
<column alignment="left" valignment="top" width="0pt">
<column alignment="left" valignment="top" width="0pt">
<column alignment="left" valignment="top" width="0pt">
@ -14532,9 +14541,9 @@ The following table documents common options which work with (almost) any
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="10" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -15525,9 +15534,9 @@ name "sec:Cluster-Operations"
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -16506,9 +16515,9 @@ name "sub:Resource-Creation"
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -17758,9 +17767,9 @@ all
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="42" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -21483,6 +21492,12 @@ resume-replay
/mars/
\family default
to fetch it.
Any replay must not have been interrupted by a replay error (see macro
%replay-code{} or diskstate
\family typewriter
DefectiveLog
\family default
).
The current designated primary must be reachable over network.
When there is no designated primary (i.e.
@ -21669,8 +21684,8 @@ pause-fetch
\family typewriter
pause-replay
\family default
), many preconditions are skipped, and MARS does its best to actually become
primary even if some logfiles are missing or incomplete.
), most preconditions are ignored, and MARS does its best to actually become
primary even if some logfiles are missing or incomplete or even defective.
\end_layout
\begin_layout Plain Layout
@ -21843,17 +21858,37 @@ your
\size scriptsize
primary --force
\family default
switches only the
switches the
\emph on
designated
\emph default
primary, but actually becoming the / an actual primary may be impossible
in case you are
primary.
In some extremely rare cases, when
\emph on
multiple
\emph default
faults have accumulated in a
\emph on
weird
\emph default
situation, it
\emph on
might
\emph default
be impossible becoming the / an actual primary.
Typically you may be
\emph on
already
\emph default
in a split brain situation.
In such a case, you
This has not been observed for a long operations time on recent versions
of MARS, but in general becoming primary via
\family typewriter
--force
\family default
cannot be guaranteed always, although MARS does its best.
In split brain situations, or if you ever encounter such a problem, you
\emph on
must
\emph default
@ -22798,9 +22833,9 @@ Logfile Operations
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -23233,9 +23268,9 @@ Consistency Operations
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -23689,9 +23724,9 @@ Inspection Commands
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="14" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25031,9 +25066,9 @@ Per-Resource Parameters
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25297,9 +25332,9 @@ Global Parameters
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="8" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25868,9 +25903,9 @@ name "sub:Waiting"
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="5" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -26479,9 +26514,9 @@ These commands are for experts and advanced sysadmins only.
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -26771,9 +26806,9 @@ Senseless Commands (from DRBD)
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="11" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -27414,9 +27449,9 @@ These commands are not implemented because they would be dangerous in MARS
\size scriptsize
\begin_inset Tabular
<lyxtabular version="3" rows="3" columns="3">
<features islongtable="true" longtabularalignment="left">
<features rotate="0" islongtable="true" longtabularalignment="left">
<column alignment="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0">
<column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">

6
userspace/marsadm
View File

@ -2079,6 +2079,12 @@ sub primary_phase0 {
check_todo($cmd, $res, "attach", 1, 0);
check_todo($cmd, $res, "fetch", 1, 0) if !$force;
check_todo($cmd, $res, "replay", 1, 0);
# check that no logfile replay errors exist.
my $replay_error = get_link("$mars/resource-$res/actual-$host/replay-code", 2);
if ($replay_error < 0) {
lwarn "Logfile replay / recovery stopped with error code $replay_error.\n";
ldie "Cannot switch to avoid unnoticed data loss. You may however do a 'primary --force'.\n" unless $force;
}
}
return if ($old eq $host and $cmd eq "primary");
return if $old eq "(none)";