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#! /usr/local/bin/perl
use strict;
use Getopt::Long;
sub usage {
print <<END;
ngcalc -- calculate node groups and table fragments
usage: ngcalc [ options ] f1 f2 ...
-g num number of node groups (default 2)
-r num number of replicas (default 2)
-n list comma-separated list of db nodes (default 1,2,...)
fX number of fragments per node group in table X (e.g. 1,2,8)
(all replicas count as same fragment)
END
exit(1);
};
use vars qw($cnoOfNodeGroups $cnoReplicas $nodeArray);
$cnoOfNodeGroups = 2;
$cnoReplicas = 2;
GetOptions(
"g=i" => \$cnoOfNodeGroups,
"r=i" => \$cnoReplicas,
"n=s" => \$nodeArray,
) or &usage;
my @tableList = @ARGV;
$cnoOfNodeGroups > 0 or &usage;
$cnoReplicas > 0 or &usage;
if (! defined($nodeArray)) {
$nodeArray = join(',', 1..($cnoOfNodeGroups*$cnoReplicas));
}
$nodeArray =~ /^\d+(,\d+)*$/ or &usage;
my @nodeArray = split(/,/, $nodeArray);
@nodeArray == $cnoOfNodeGroups*$cnoReplicas or &usage;
my @nodeGroupRecord;
for (my $i = 0; $i < $cnoOfNodeGroups; $i++) {
my $rec = {};
my $nodes = [];
for (my $j = 0; $j < $cnoReplicas; $j++) {
push(@$nodes, $nodeArray[$i * $cnoReplicas + $j]);
}
$rec->{nodesInGroup} = $nodes;
$rec->{nodeCount} = $cnoReplicas;
$rec->{nextReplicaNode} = 0;
$nodeGroupRecord[$i] = $rec;
print "NG $i: ", join(" ", @{$rec->{nodesInGroup}}), "\n";
}
# see Dbdih::execCREATE_FRAGMENTATION_REQ
my $c_nextNodeGroup = 0;
for (my $t = 0; $t < @tableList; $t++) {
use integer;
my $f = $tableList[$t];
my $ng = $c_nextNodeGroup++;
$c_nextNodeGroup = 0 if $c_nextNodeGroup == $cnoOfNodeGroups;
my $noOfFragments = $f * $cnoOfNodeGroups;
my @fragments;
for (my $fragNo = 0; $fragNo < $noOfFragments; $fragNo++) {
my $rec = $nodeGroupRecord[$ng];
my $max = $rec->{nodeCount};
my $ind = $rec->{nextReplicaNode};
$rec->{nextReplicaNode} = ($ind + 1 >= $max ? 0 : $ind + 1);
for (my $replicaNo = 0; $replicaNo < $cnoReplicas; $replicaNo++) {
my $nodeId = $rec->{nodesInGroup}[$ind++];
push(@fragments, $nodeId);
$ind = ($ind == $max ? 0 : $ind);
}
$ng++;
$ng = ($ng == $cnoOfNodeGroups ? 0 : $ng);
}
printf "%02d %s\n", $t, join(" ", @fragments);
}
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