-
Notifications
You must be signed in to change notification settings - Fork 0
/
migration.jl
248 lines (218 loc) · 8.72 KB
/
migration.jl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
# SPDX-License-Identifier: MPL-2.0
module Migration
export RecipientMoved, MigrationService, migrate_to_nearest, migrate, MigrationAlternatives
using CircoCore, ..Circo, ..Circo.Cluster, Circo.Monitor
using Plugins
using DataStructures, LinearAlgebra
import Base.length
const AUTOMIGRATE_TOLERANCE = 1e-2
struct MigrationRequest
actor::Actor
end
struct MigrationResponse
from::Addr
to::Addr
success::Bool
end
"""
RecipientMoved{TBody}
If a message is not delivered because the target actor moved to a known location,
this message will be sent back to the sender.
The original message gets included in the `RecipientMoved` message. Resending to the new location and updating the
address in their storage is the responsibility of the original sender.
```
struct RecipientMoved{TBody}
oldaddress::Addr
newaddress::Addr
originalmessage::TBody
end
```
"""
struct RecipientMoved{TBody}
oldaddress::Addr
newaddress::Addr
originalmessage::TBody
end
struct MovingActor
actor::Actor
messages::Queue{AbstractMsg}
MovingActor(actor::Actor) = new(actor, Queue{AbstractMsg}())
end
mutable struct MigrationAlternatives
peers::Array{NodeInfo}
cache::Peers
MigrationAlternatives() = new([], Peers())
MigrationAlternatives(peers) = new(peers, Peers(peers))
end
Base.length(a::MigrationAlternatives) = Base.length(a.peers)
Base.getindex(a::MigrationAlternatives, addr) = a.cache[addr]
Base.get(a::MigrationAlternatives, k, def) = get(a.cache, k, def)
refresh!(a::MigrationAlternatives) = a.peers = collect(values(a.cache))
function Base.push!(a::MigrationAlternatives, peer)
a.cache[peer.addr] = peer
refresh!(a)
return a
end
function Base.delete!(a::MigrationAlternatives, peeraddr)
if haskey(a.cache.cache, peeraddr)
delete!(a.cache, peeraddr)
refresh!(a)
end
return a
end
abstract type MigrationService <: Plugin end
mutable struct MigrationServiceImpl <: MigrationService
registry::CircoCore.LocalRegistry
movingactors::Dict{ActorId,MovingActor}
movedactors::Dict{ActorId,Addr}
alternatives::MigrationAlternatives
helperactor::Any
scheduler
MigrationServiceImpl(registry::CircoCore.LocalRegistry,::ClusterService; options...) = new(registry,Dict([]),Dict([]),MigrationAlternatives())
end
Plugins.symbol(::MigrationServiceImpl) = :migration
Plugins.deps(::Type{MigrationServiceImpl}) = [CircoCore.LocalRegistry, ClusterService]
__init__() = Plugins.register(MigrationServiceImpl)
mutable struct MigrationHelper{TCore} <: Actor{TCore}
service::MigrationServiceImpl
core::TCore
end
Circo.monitorprojection(::Type{<:MigrationHelper}) = JS("projections.nonimportant")
function Circo.schedule_start(migration::MigrationServiceImpl, sdl)
migration.scheduler = sdl
end
Circo.Cluster.cluster_initialized(migration::MigrationServiceImpl, sdl, cluster) = begin
migration.helperactor = MigrationHelper(migration, emptycore(sdl.service))
spawn(sdl.service, migration.helperactor)
end
function Circo.onmessage(me::MigrationHelper, ::OnSpawn, service)
cluster = getname(service, "cluster")
isnothing(cluster) && error("Migration depends on cluster, but the name 'cluster' is not registered.")
registername(service, "migration", me)
send(service, me, cluster, Subscribe(PeerAdded, me))
send(service, me, cluster, Subscribe(PeerRemoved, me))
send(service, me, cluster, PeersRequest(me))
end
function Circo.onmessage(me::MigrationHelper, msg::PeersResponse, service)
target_peers = collect(values(msg.peers))
me.service.alternatives = MigrationAlternatives(target_peers) # TODO strip if lengthy
end
function Circo.onmessage(me::MigrationHelper, msg::PeerAdded, service)
push!(me.service.alternatives, msg.peer)
end
function Circo.onmessage(me::MigrationHelper, msg::PeerRemoved, service)
delete!(me.service.alternatives, msg.peer.addr)
end
"""
migrate(service, actor::Actor, topostcode::PostCode)
"""
@inline function migrate(service::CircoCore.AbstractService, actor::Actor, topostcode::PostCode)
return migrate!(service.scheduler, actor, topostcode)
end
function migrate!(scheduler, actor::Actor, topostcode::PostCode)
if topostcode == postcode(scheduler)
return false
end
migration = scheduler.plugins[:migration]
if isnothing(migration)
@debug "Migration plugin not loaded, skipping migrate!"
return false
end
migration::MigrationServiceImpl
unschedule!(scheduler, actor)
migration.movingactors[box(actor)] = MovingActor(actor)
send(scheduler.service, migration.helperactor, Addr(topostcode, 0), MigrationRequest(actor))
return true
end
Circo.specialmsg(::MigrationServiceImpl, scheduler, message) = false
Circo.specialmsg(migration::MigrationServiceImpl, scheduler, message::AbstractMsg{MigrationRequest}) = begin
@debug "Migration request: $(message)"
actor = body(message).actor
actorbox = box(actor)
fromaddress = addr(actor)
if haskey(migration.movingactors, actorbox)
@info "Thread $(Threads.threadid()): $actorbox fast back-and forth moving: got MigrationRequest while waiting for a response. Accept."
end
delete!(migration.movedactors, actorbox)
spawn(scheduler, actor)
Circo.onmigrate(actor, scheduler.service)
send(scheduler.service, actor, Addr(postcode(fromaddress), 0), MigrationResponse(fromaddress, addr(actor), true))
return true
end
Circo.specialmsg(migration::MigrationServiceImpl, scheduler, message::AbstractMsg{MigrationResponse}) = begin
@debug("Migration response: at $(postcode(scheduler)): $(message)")
response = body(message)
movingactor = pop!(migration.movingactors, box(response.to), nothing)
if isnothing(movingactor) # TODO check if this is safe
@info " $(Threads.threadid()) Got MigrationResponse for $(box(response.to)), but it is not moving."
end
if response.success
@debug "Succesful migration: $(response.from) to $(response.to) (at $(postcode(scheduler)))"
migration.movedactors[box(response.from)] = response.to
if !isnothing(movingactor)
for message in movingactor.messages
CircoCore.deliver!(scheduler, message)
end
end
else
if !isnothing(movingactor)
schedule!(scheduler, movingactor.actor) # TODO callback + tests
end
end
return true
end
Circo.localroutes(migration::MigrationServiceImpl, scheduler, message::AbstractMsg)::Bool = begin
newaddress = get(migration.movedactors, box(target(message)), nothing)
if isnothing(newaddress)
movingactor = get(migration.movingactors, box(target(message)), nothing)
if isnothing(movingactor)
return false
else
enqueue!(movingactor.messages, message)
#@debug "Enqueing $(typeof(message)) for $(typeof(movingactor.actor))"
return true
end
else
if body(message) isa RecipientMoved # Got a RecipientMoved, but the original sender also moved. Forward the RecipientMoved
@debug "Forwarding message $message to $newaddress"
send(scheduler.service, migration.helperactor, newaddress, body(message))
else # Do not forward normal messages but send back a RecipientMoved
recipientmoved = RecipientMoved(target(message), newaddress, body(message))
@debug "Recipient Moved: $recipientmoved"
#@debug "$(migration.movedactors)"
send(scheduler.service, migration.helperactor, sender(message), recipientmoved)
end
return true
end
end
@inline check_migration(me::Actor, alternatives::MigrationAlternatives, service) = nothing
@inline CircoCore.actor_activity_sparse256(migration::MigrationServiceImpl, scheduler, actor::Actor) = begin
check_migration(actor, migration.alternatives, scheduler.service)
end
@inline @fastmath function find_nearest(sourcepos::Pos, alternatives::MigrationAlternatives)::Union{NodeInfo, Nothing}
peers = alternatives.peers
if length(peers) < 2
return nothing
end
found = peers[1]
mindist = norm(pos(found) - sourcepos)
for peer in peers[2:end]
dist = norm(pos(peer) - sourcepos)
if dist < mindist
mindist = dist
found = peer
end
end
return found
end
@inline @fastmath function migrate_to_nearest(me::Actor, alternatives::MigrationAlternatives, service, tolerance=AUTOMIGRATE_TOLERANCE)
nearest = find_nearest(pos(me), alternatives)
if isnothing(nearest) return nothing end
if box(nearest.addr) === box(addr(me)) return nothing end
if norm(pos(me) - pos(nearest)) < (1.0 - tolerance) * norm(pos(me) - pos(service))
@debug "Migrating to $(postcode(nearest))"
migrate(service, me, postcode(nearest))
end
return nothing
end
end # module