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redis-trib: allow to reshard in non-interactive way.

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The introduction of --from --to --slots --yes options allow to reshard
from cli in an automated way from scripts. The code is ugly and needs
refactoring as soon as we get it in RC / stable release.
This commit is contained in:
antirez 2014-07-18 17:43:49 +02:00
parent 8d4ff87b26
commit 73a809b159
1 changed files with 86 additions and 41 deletions
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127
src/redis-trib.rb
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@ -821,50 +821,92 @@ class RedisTrib
puts "*** Please fix your cluster problems before resharding"
exit 1
end
numslots = 0
while numslots <= 0 or numslots > ClusterHashSlots
print "How many slots do you want to move (from 1 to #{ClusterHashSlots})? "
numslots = STDIN.gets.to_i
# Get number of slots
if opt['slots']
numslots = opt['slots'].to_i
else
numslots = 0
while numslots <= 0 or numslots > ClusterHashSlots
print "How many slots do you want to move (from 1 to #{ClusterHashSlots})? "
numslots = STDIN.gets.to_i
end
end
target = nil
while not target
print "What is the receiving node ID? "
target = get_node_by_name(STDIN.gets.chop)
# Get the target instance
if opt['to']
target = get_node_by_name(opt['to'])
if !target || target.has_flag?("slave")
xputs "*** The specified node is not known or not a master, please retry."
target = nil
exit 1
end
end
sources = []
xputs "Please enter all the source node IDs."
xputs " Type 'all' to use all the nodes as source nodes for the hash slots."
xputs " Type 'done' once you entered all the source nodes IDs."
while true
print "Source node ##{sources.length+1}:"
line = STDIN.gets.chop
src = get_node_by_name(line)
if line == "done"
if sources.length == 0
puts "No source nodes given, operation aborted"
exit 1
else
break
else
target = nil
while not target
print "What is the receiving node ID? "
target = get_node_by_name(STDIN.gets.chop)
if !target || target.has_flag?("slave")
xputs "*** The specified node is not known or not a master, please retry."
target = nil
end
elsif line == "all"
@nodes.each{|n|
next if n.info[:name] == target.info[:name]
next if n.has_flag?("slave")
sources << n
}
break
elsif !src || src.has_flag?("slave")
xputs "*** The specified node is not known or is not a master, please retry."
elsif src.info[:name] == target.info[:name]
xputs "*** It is not possible to use the target node as source node."
else
sources << src
end
end
# Get the source instances
sources = []
if opt['from']
opt['from'].split(',').each{|node_id|
src = get_node_by_name(node_id)
if !src || src.has_flag?("slave")
xputs "*** The specified node is not known or is not a master, please retry."
exit 1
end
sources << src
}
else
xputs "Please enter all the source node IDs."
xputs " Type 'all' to use all the nodes as source nodes for the hash slots."
xputs " Type 'done' once you entered all the source nodes IDs."
while true
print "Source node ##{sources.length+1}:"
line = STDIN.gets.chop
src = get_node_by_name(line)
if line == "done"
break
elsif line == "all"
sources = "all"
break
elsif !src || src.has_flag?("slave")
xputs "*** The specified node is not known or is not a master, please retry."
elsif src.info[:name] == target.info[:name]
xputs "*** It is not possible to use the target node as source node."
else
sources << src
end
end
end
if sources.length == 0
puts "*** No source nodes given, operation aborted"
exit 1
end
# Handle soures == all.
if sources == "all"
sources = []
@nodes.each{|n|
next if n.info[:name] == target.info[:name]
next if n.has_flag?("slave")
sources << n
}
end
# Check if the destination node is the same of any source nodes.
if sources.index(target)
xputs "*** Target node is also listed among the source nodes!"
exit 1
end
puts "\nReady to move #{numslots} slots."
puts " Source nodes:"
sources.each{|s| puts " "+s.info_string}
@ -873,9 +915,11 @@ class RedisTrib
reshard_table = compute_reshard_table(sources,numslots)
puts " Resharding plan:"
show_reshard_table(reshard_table)
print "Do you want to proceed with the proposed reshard plan (yes/no)? "
yesno = STDIN.gets.chop
exit(1) if (yesno != "yes")
if !opt['yes']
print "Do you want to proceed with the proposed reshard plan (yes/no)? "
yesno = STDIN.gets.chop
exit(1) if (yesno != "yes")
end
reshard_table.each{|e|
move_slot(e[:source],target,e[:slot],:verbose=>true)
}
@ -1253,7 +1297,8 @@ COMMANDS={
ALLOWED_OPTIONS={
"create" => {"replicas" => true},
"add-node" => {"slave" => false, "master-id" => true},
"import" => {"from" => :required}
"import" => {"from" => :required},
"reshard" => {"from" => true, "to" => true, "slots" => true, "yes" => false}
}
def show_help