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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
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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/ #LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 413 \lyxformat 474
\begin_document \begin_document
\begin_header \begin_header
\textclass scrreprt \textclass scrreprt
@ -22,13 +22,13 @@ fixltx2e
\font_roman default \font_roman default
\font_sans default \font_sans default
\font_typewriter default \font_typewriter default
\font_math auto
\font_default_family rmdefault \font_default_family rmdefault
\use_non_tex_fonts false \use_non_tex_fonts false
\font_sc false \font_sc false
\font_osf false \font_osf false
\font_sf_scale 100 \font_sf_scale 100
\font_tt_scale 100 \font_tt_scale 100
\graphics default \graphics default
\default_output_format default \default_output_format default
\output_sync 0 \output_sync 0
@ -50,15 +50,24 @@ fixltx2e
\pdf_pdfusetitle true \pdf_pdfusetitle true
\papersize a4paper \papersize a4paper
\use_geometry true \use_geometry true
\use_amsmath 1 \use_package amsmath 1
\use_esint 1 \use_package amssymb 1
\use_mhchem 1 \use_package cancel 1
\use_mathdots 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 basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false \use_bibtopic false
\use_indices false \use_indices false
\paperorientation portrait \paperorientation portrait
\suppress_date false \suppress_date false
\justification true
\use_refstyle 1 \use_refstyle 1
\index Index \index Index
\shortcut idx \shortcut idx
@ -570,9 +579,9 @@ The following table is a short guide to the most important cases where the
\align center \align center
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="6" columns="2"> <lyxtabular version="3" rows="6" columns="2">
<features tabularvalignment="middle"> <features rotate="0" tabularvalignment="middle">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<row> <row>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
\begin_inset Text \begin_inset Text
@ -6904,10 +6913,10 @@ should
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="3" columns="3"> <lyxtabular version="3" rows="3" columns="3">
<features tabularvalignment="middle"> <features rotate="0" tabularvalignment="middle">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<row> <row>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
\begin_inset Text \begin_inset Text
@ -7699,7 +7708,7 @@ status open
\end_layout \end_layout
\begin_layout Plain Layout \begin_layout Plain Layout
\begin_inset Caption \begin_inset Caption Standard
\begin_layout Plain Layout \begin_layout Plain Layout
overview on amounts / cursors overview on amounts / cursors
@ -11943,7 +11952,7 @@ remembers
\size tiny \size tiny
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3"> <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"> <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 \size tiny
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="9" columns="3"> <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"> <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 \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="10" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -15525,9 +15534,9 @@ name "sec:Cluster-Operations"
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -16506,9 +16515,9 @@ name "sub:Resource-Creation"
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="6" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -17758,9 +17767,9 @@ all
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="42" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -21483,6 +21492,12 @@ resume-replay
/mars/ /mars/
\family default \family default
to fetch it. 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. The current designated primary must be reachable over network.
When there is no designated primary (i.e. When there is no designated primary (i.e.
@ -21669,8 +21684,8 @@ pause-fetch
\family typewriter \family typewriter
pause-replay pause-replay
\family default \family default
), many preconditions are skipped, and MARS does its best to actually become ), most preconditions are ignored, and MARS does its best to actually become
primary even if some logfiles are missing or incomplete. primary even if some logfiles are missing or incomplete or even defective.
\end_layout \end_layout
\begin_layout Plain Layout \begin_layout Plain Layout
@ -21843,17 +21858,37 @@ your
\size scriptsize \size scriptsize
primary --force primary --force
\family default \family default
switches only the switches the
\emph on \emph on
designated designated
\emph default \emph default
primary, but actually becoming the / an actual primary may be impossible primary.
in case you are 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 \emph on
already already
\emph default \emph default
in a split brain situation. 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 \emph on
must must
\emph default \emph default
@ -22798,9 +22833,9 @@ Logfile Operations
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -23233,9 +23268,9 @@ Consistency Operations
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -23689,9 +23724,9 @@ Inspection Commands
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="14" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25031,9 +25066,9 @@ Per-Resource Parameters
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25297,9 +25332,9 @@ Global Parameters
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="8" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -25868,9 +25903,9 @@ name "sub:Waiting"
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="5" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <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 \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="4" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@ -26771,9 +26806,9 @@ Senseless Commands (from DRBD)
\size scriptsize \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="11" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <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 \size scriptsize
\begin_inset Tabular \begin_inset Tabular
<lyxtabular version="3" rows="3" columns="3"> <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="left" valignment="top" width="0pt">
<column alignment="center" valignment="top" width="0"> <column alignment="center" valignment="top">
<column alignment="left" valignment="top" width="0pt"> <column alignment="left" valignment="top" width="0pt">
<row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true"> <row endhead="true" endfirsthead="true" endfoot="true" endlastfoot="true">
<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none"> <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, $res, "attach", 1, 0);
check_todo($cmd, $res, "fetch", 1, 0) if !$force; check_todo($cmd, $res, "fetch", 1, 0) if !$force;
check_todo($cmd, $res, "replay", 1, 0); check_todo($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 $host and $cmd eq "primary");
return if $old eq "(none)"; return if $old eq "(none)";