root / lib / workerpool.py @ 42ff3343
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1 | 76094e37 | Michael Hanselmann | #
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2 | 76094e37 | Michael Hanselmann | #
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3 | 76094e37 | Michael Hanselmann | |
4 | 76094e37 | Michael Hanselmann | # Copyright (C) 2008 Google Inc.
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5 | 76094e37 | Michael Hanselmann | #
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6 | 76094e37 | Michael Hanselmann | # This program is free software; you can redistribute it and/or modify
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7 | 76094e37 | Michael Hanselmann | # it under the terms of the GNU General Public License as published by
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8 | 76094e37 | Michael Hanselmann | # the Free Software Foundation; either version 2 of the License, or
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9 | 76094e37 | Michael Hanselmann | # (at your option) any later version.
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10 | 76094e37 | Michael Hanselmann | #
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11 | 76094e37 | Michael Hanselmann | # This program is distributed in the hope that it will be useful, but
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12 | 76094e37 | Michael Hanselmann | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 76094e37 | Michael Hanselmann | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 76094e37 | Michael Hanselmann | # General Public License for more details.
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15 | 76094e37 | Michael Hanselmann | #
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16 | 76094e37 | Michael Hanselmann | # You should have received a copy of the GNU General Public License
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17 | 76094e37 | Michael Hanselmann | # along with this program; if not, write to the Free Software
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18 | 76094e37 | Michael Hanselmann | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | 76094e37 | Michael Hanselmann | # 02110-1301, USA.
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20 | 76094e37 | Michael Hanselmann | |
21 | 76094e37 | Michael Hanselmann | |
22 | 76094e37 | Michael Hanselmann | """Base classes for worker pools.
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23 | 76094e37 | Michael Hanselmann |
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24 | 76094e37 | Michael Hanselmann | """
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25 | 76094e37 | Michael Hanselmann | |
26 | 76094e37 | Michael Hanselmann | import collections |
27 | 76094e37 | Michael Hanselmann | import logging |
28 | 76094e37 | Michael Hanselmann | import threading |
29 | 76094e37 | Michael Hanselmann | |
30 | 76094e37 | Michael Hanselmann | from ganeti import errors |
31 | 76094e37 | Michael Hanselmann | from ganeti import utils |
32 | 76094e37 | Michael Hanselmann | |
33 | 76094e37 | Michael Hanselmann | |
34 | 76094e37 | Michael Hanselmann | class BaseWorker(threading.Thread, object): |
35 | 76094e37 | Michael Hanselmann | """Base worker class for worker pools.
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36 | 76094e37 | Michael Hanselmann |
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37 | 76094e37 | Michael Hanselmann | Users of a worker pool must override RunTask in a subclass.
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38 | 76094e37 | Michael Hanselmann |
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39 | 76094e37 | Michael Hanselmann | """
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40 | 76094e37 | Michael Hanselmann | def __init__(self, pool, worker_id): |
41 | 76094e37 | Michael Hanselmann | """Constructor for BaseWorker thread.
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42 | 76094e37 | Michael Hanselmann |
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43 | 76094e37 | Michael Hanselmann | Args:
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44 | 76094e37 | Michael Hanselmann | - pool: Parent worker pool
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45 | 76094e37 | Michael Hanselmann | - worker_id: Identifier for this worker
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46 | 76094e37 | Michael Hanselmann |
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47 | 76094e37 | Michael Hanselmann | """
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48 | 76094e37 | Michael Hanselmann | super(BaseWorker, self).__init__() |
49 | 76094e37 | Michael Hanselmann | self.pool = pool
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50 | 76094e37 | Michael Hanselmann | self.worker_id = worker_id
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51 | 76094e37 | Michael Hanselmann | self._current_task = None |
52 | 76094e37 | Michael Hanselmann | |
53 | 76094e37 | Michael Hanselmann | def ShouldTerminate(self): |
54 | 76094e37 | Michael Hanselmann | """Returns whether a worker should terminate.
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55 | 76094e37 | Michael Hanselmann |
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56 | 76094e37 | Michael Hanselmann | """
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57 | 76094e37 | Michael Hanselmann | return self.pool.ShouldWorkerTerminate(self) |
58 | 76094e37 | Michael Hanselmann | |
59 | b3558df1 | Michael Hanselmann | def _HasRunningTaskUnlocked(self): |
60 | b3558df1 | Michael Hanselmann | """Returns whether this worker is currently running a task.
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61 | b3558df1 | Michael Hanselmann |
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62 | b3558df1 | Michael Hanselmann | """
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63 | b3558df1 | Michael Hanselmann | return (self._current_task is not None) |
64 | b3558df1 | Michael Hanselmann | |
65 | b3558df1 | Michael Hanselmann | def HasRunningTask(self): |
66 | b3558df1 | Michael Hanselmann | """Returns whether this worker is currently running a task.
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67 | b3558df1 | Michael Hanselmann |
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68 | b3558df1 | Michael Hanselmann | """
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69 | b3558df1 | Michael Hanselmann | self.pool._lock.acquire()
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70 | b3558df1 | Michael Hanselmann | try:
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71 | b3558df1 | Michael Hanselmann | return self._HasRunningTaskUnlocked() |
72 | b3558df1 | Michael Hanselmann | finally:
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73 | b3558df1 | Michael Hanselmann | self.pool._lock.release()
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74 | b3558df1 | Michael Hanselmann | |
75 | 76094e37 | Michael Hanselmann | def run(self): |
76 | 76094e37 | Michael Hanselmann | """Main thread function.
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77 | 76094e37 | Michael Hanselmann |
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78 | 76094e37 | Michael Hanselmann | Waits for new tasks to show up in the queue.
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79 | 76094e37 | Michael Hanselmann |
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80 | 76094e37 | Michael Hanselmann | """
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81 | 76094e37 | Michael Hanselmann | pool = self.pool
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82 | 76094e37 | Michael Hanselmann | |
83 | b3558df1 | Michael Hanselmann | assert not self.HasRunningTask() |
84 | 76094e37 | Michael Hanselmann | |
85 | 76094e37 | Michael Hanselmann | while True: |
86 | 76094e37 | Michael Hanselmann | try:
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87 | 76094e37 | Michael Hanselmann | # We wait on lock to be told either terminate or do a task.
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88 | 76094e37 | Michael Hanselmann | pool._lock.acquire() |
89 | 76094e37 | Michael Hanselmann | try:
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90 | 76094e37 | Michael Hanselmann | if pool._ShouldWorkerTerminateUnlocked(self): |
91 | 76094e37 | Michael Hanselmann | break
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92 | 76094e37 | Michael Hanselmann | |
93 | 76094e37 | Michael Hanselmann | # We only wait if there's no task for us.
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94 | 76094e37 | Michael Hanselmann | if not pool._tasks: |
95 | b3558df1 | Michael Hanselmann | logging.debug("Worker %s: waiting for tasks", self.worker_id) |
96 | b3558df1 | Michael Hanselmann | |
97 | 76094e37 | Michael Hanselmann | # wait() releases the lock and sleeps until notified
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98 | 53b1d12b | Michael Hanselmann | pool._pool_to_worker.wait() |
99 | 76094e37 | Michael Hanselmann | |
100 | b3558df1 | Michael Hanselmann | logging.debug("Worker %s: notified while waiting", self.worker_id) |
101 | b3558df1 | Michael Hanselmann | |
102 | 76094e37 | Michael Hanselmann | # Were we woken up in order to terminate?
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103 | 76094e37 | Michael Hanselmann | if pool._ShouldWorkerTerminateUnlocked(self): |
104 | 76094e37 | Michael Hanselmann | break
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105 | 76094e37 | Michael Hanselmann | |
106 | 76094e37 | Michael Hanselmann | if not pool._tasks: |
107 | 76094e37 | Michael Hanselmann | # Spurious notification, ignore
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108 | 76094e37 | Michael Hanselmann | continue
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109 | 76094e37 | Michael Hanselmann | |
110 | 76094e37 | Michael Hanselmann | # Get task from queue and tell pool about it
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111 | 76094e37 | Michael Hanselmann | try:
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112 | 76094e37 | Michael Hanselmann | self._current_task = pool._tasks.popleft()
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113 | 76094e37 | Michael Hanselmann | finally:
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114 | 53b1d12b | Michael Hanselmann | pool._worker_to_pool.notifyAll() |
115 | 76094e37 | Michael Hanselmann | finally:
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116 | 76094e37 | Michael Hanselmann | pool._lock.release() |
117 | 76094e37 | Michael Hanselmann | |
118 | 76094e37 | Michael Hanselmann | # Run the actual task
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119 | 76094e37 | Michael Hanselmann | try:
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120 | b3558df1 | Michael Hanselmann | logging.debug("Worker %s: starting task %r",
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121 | b3558df1 | Michael Hanselmann | self.worker_id, self._current_task) |
122 | 76094e37 | Michael Hanselmann | self.RunTask(*self._current_task) |
123 | b3558df1 | Michael Hanselmann | logging.debug("Worker %s: done with task %r",
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124 | b3558df1 | Michael Hanselmann | self.worker_id, self._current_task) |
125 | 76094e37 | Michael Hanselmann | except:
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126 | 76094e37 | Michael Hanselmann | logging.error("Worker %s: Caught unhandled exception",
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127 | 76094e37 | Michael Hanselmann | self.worker_id, exc_info=True) |
128 | 76094e37 | Michael Hanselmann | finally:
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129 | 76094e37 | Michael Hanselmann | # Notify pool
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130 | 76094e37 | Michael Hanselmann | pool._lock.acquire() |
131 | 76094e37 | Michael Hanselmann | try:
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132 | b3558df1 | Michael Hanselmann | if self._current_task: |
133 | b3558df1 | Michael Hanselmann | self._current_task = None |
134 | 53b1d12b | Michael Hanselmann | pool._worker_to_pool.notifyAll() |
135 | 76094e37 | Michael Hanselmann | finally:
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136 | 76094e37 | Michael Hanselmann | pool._lock.release() |
137 | 76094e37 | Michael Hanselmann | |
138 | b3558df1 | Michael Hanselmann | logging.debug("Worker %s: terminates", self.worker_id) |
139 | b3558df1 | Michael Hanselmann | |
140 | 76094e37 | Michael Hanselmann | def RunTask(self, *args): |
141 | 76094e37 | Michael Hanselmann | """Function called to start a task.
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142 | 76094e37 | Michael Hanselmann |
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143 | 76094e37 | Michael Hanselmann | """
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144 | 76094e37 | Michael Hanselmann | raise NotImplementedError() |
145 | 76094e37 | Michael Hanselmann | |
146 | 76094e37 | Michael Hanselmann | |
147 | 76094e37 | Michael Hanselmann | class WorkerPool(object): |
148 | 76094e37 | Michael Hanselmann | """Worker pool with a queue.
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149 | 76094e37 | Michael Hanselmann |
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150 | 76094e37 | Michael Hanselmann | This class is thread-safe.
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151 | 76094e37 | Michael Hanselmann |
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152 | 76094e37 | Michael Hanselmann | Tasks are guaranteed to be started in the order in which they're added to the
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153 | 76094e37 | Michael Hanselmann | pool. Due to the nature of threading, they're not guaranteed to finish in the
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154 | 76094e37 | Michael Hanselmann | same order.
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155 | 76094e37 | Michael Hanselmann |
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156 | 76094e37 | Michael Hanselmann | """
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157 | 76094e37 | Michael Hanselmann | def __init__(self, num_workers, worker_class): |
158 | 76094e37 | Michael Hanselmann | """Constructor for worker pool.
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159 | 76094e37 | Michael Hanselmann |
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160 | 76094e37 | Michael Hanselmann | Args:
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161 | 76094e37 | Michael Hanselmann | - num_workers: Number of workers to be started (dynamic resizing is not
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162 | 76094e37 | Michael Hanselmann | yet implemented)
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163 | 76094e37 | Michael Hanselmann | - worker_class: Class to be instantiated for workers; should derive from
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164 | 76094e37 | Michael Hanselmann | BaseWorker
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165 | 76094e37 | Michael Hanselmann |
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166 | 76094e37 | Michael Hanselmann | """
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167 | 76094e37 | Michael Hanselmann | # Some of these variables are accessed by BaseWorker
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168 | 53b1d12b | Michael Hanselmann | self._lock = threading.Lock()
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169 | 53b1d12b | Michael Hanselmann | self._pool_to_pool = threading.Condition(self._lock) |
170 | 53b1d12b | Michael Hanselmann | self._pool_to_worker = threading.Condition(self._lock) |
171 | 53b1d12b | Michael Hanselmann | self._worker_to_pool = threading.Condition(self._lock) |
172 | 76094e37 | Michael Hanselmann | self._worker_class = worker_class
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173 | 76094e37 | Michael Hanselmann | self._last_worker_id = 0 |
174 | 76094e37 | Michael Hanselmann | self._workers = []
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175 | 76094e37 | Michael Hanselmann | self._quiescing = False |
176 | 76094e37 | Michael Hanselmann | |
177 | 76094e37 | Michael Hanselmann | # Terminating workers
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178 | 76094e37 | Michael Hanselmann | self._termworkers = []
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179 | 76094e37 | Michael Hanselmann | |
180 | 76094e37 | Michael Hanselmann | # Queued tasks
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181 | 76094e37 | Michael Hanselmann | self._tasks = collections.deque()
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182 | 76094e37 | Michael Hanselmann | |
183 | 76094e37 | Michael Hanselmann | # Start workers
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184 | 76094e37 | Michael Hanselmann | self.Resize(num_workers)
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185 | 76094e37 | Michael Hanselmann | |
186 | 76094e37 | Michael Hanselmann | # TODO: Implement dynamic resizing?
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187 | 76094e37 | Michael Hanselmann | |
188 | 76094e37 | Michael Hanselmann | def AddTask(self, *args): |
189 | 76094e37 | Michael Hanselmann | """Adds a task to the queue.
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190 | 76094e37 | Michael Hanselmann |
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191 | 76094e37 | Michael Hanselmann | Args:
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192 | 76094e37 | Michael Hanselmann | - *args: Arguments passed to BaseWorker.RunTask
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193 | 76094e37 | Michael Hanselmann |
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194 | 76094e37 | Michael Hanselmann | """
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195 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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196 | 76094e37 | Michael Hanselmann | try:
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197 | 76094e37 | Michael Hanselmann | # Don't add new tasks while we're quiescing
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198 | 76094e37 | Michael Hanselmann | while self._quiescing: |
199 | 53b1d12b | Michael Hanselmann | self._pool_to_pool.wait()
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200 | 76094e37 | Michael Hanselmann | |
201 | 76094e37 | Michael Hanselmann | # Add task to internal queue
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202 | 76094e37 | Michael Hanselmann | self._tasks.append(args)
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203 | 53b1d12b | Michael Hanselmann | |
204 | 53b1d12b | Michael Hanselmann | # Wake one idling worker up
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205 | 53b1d12b | Michael Hanselmann | self._pool_to_worker.notify()
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206 | 76094e37 | Michael Hanselmann | finally:
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207 | 76094e37 | Michael Hanselmann | self._lock.release()
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208 | 76094e37 | Michael Hanselmann | |
209 | 76094e37 | Michael Hanselmann | def _ShouldWorkerTerminateUnlocked(self, worker): |
210 | 76094e37 | Michael Hanselmann | """Returns whether a worker should terminate.
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211 | 76094e37 | Michael Hanselmann |
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212 | 76094e37 | Michael Hanselmann | """
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213 | 76094e37 | Michael Hanselmann | return (worker in self._termworkers) |
214 | 76094e37 | Michael Hanselmann | |
215 | 76094e37 | Michael Hanselmann | def ShouldWorkerTerminate(self, worker): |
216 | 76094e37 | Michael Hanselmann | """Returns whether a worker should terminate.
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217 | 76094e37 | Michael Hanselmann |
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218 | 76094e37 | Michael Hanselmann | """
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219 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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220 | 76094e37 | Michael Hanselmann | try:
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221 | 76094e37 | Michael Hanselmann | return self._ShouldWorkerTerminateUnlocked(self) |
222 | 76094e37 | Michael Hanselmann | finally:
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223 | 76094e37 | Michael Hanselmann | self._lock.release()
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224 | 76094e37 | Michael Hanselmann | |
225 | 76094e37 | Michael Hanselmann | def _HasRunningTasksUnlocked(self): |
226 | 76094e37 | Michael Hanselmann | """Checks whether there's a task running in a worker.
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227 | 76094e37 | Michael Hanselmann |
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228 | 76094e37 | Michael Hanselmann | """
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229 | 76094e37 | Michael Hanselmann | for worker in self._workers + self._termworkers: |
230 | b3558df1 | Michael Hanselmann | if worker._HasRunningTaskUnlocked():
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231 | 76094e37 | Michael Hanselmann | return True |
232 | 76094e37 | Michael Hanselmann | return False |
233 | 76094e37 | Michael Hanselmann | |
234 | 76094e37 | Michael Hanselmann | def Quiesce(self): |
235 | 76094e37 | Michael Hanselmann | """Waits until the task queue is empty.
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236 | 76094e37 | Michael Hanselmann |
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237 | 76094e37 | Michael Hanselmann | """
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238 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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239 | 76094e37 | Michael Hanselmann | try:
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240 | 76094e37 | Michael Hanselmann | self._quiescing = True |
241 | 76094e37 | Michael Hanselmann | |
242 | 76094e37 | Michael Hanselmann | # Wait while there are tasks pending or running
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243 | 76094e37 | Michael Hanselmann | while self._tasks or self._HasRunningTasksUnlocked(): |
244 | 53b1d12b | Michael Hanselmann | self._worker_to_pool.wait()
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245 | 76094e37 | Michael Hanselmann | |
246 | 76094e37 | Michael Hanselmann | finally:
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247 | 76094e37 | Michael Hanselmann | self._quiescing = False |
248 | 76094e37 | Michael Hanselmann | |
249 | 76094e37 | Michael Hanselmann | # Make sure AddTasks continues in case it was waiting
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250 | 53b1d12b | Michael Hanselmann | self._pool_to_pool.notifyAll()
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251 | 76094e37 | Michael Hanselmann | |
252 | 76094e37 | Michael Hanselmann | self._lock.release()
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253 | 76094e37 | Michael Hanselmann | |
254 | 76094e37 | Michael Hanselmann | def _NewWorkerIdUnlocked(self): |
255 | 76094e37 | Michael Hanselmann | self._last_worker_id += 1 |
256 | 76094e37 | Michael Hanselmann | return self._last_worker_id |
257 | 76094e37 | Michael Hanselmann | |
258 | 76094e37 | Michael Hanselmann | def _ResizeUnlocked(self, num_workers): |
259 | 76094e37 | Michael Hanselmann | """Changes the number of workers.
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260 | 76094e37 | Michael Hanselmann |
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261 | 76094e37 | Michael Hanselmann | """
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262 | 76094e37 | Michael Hanselmann | assert num_workers >= 0, "num_workers must be >= 0" |
263 | 76094e37 | Michael Hanselmann | |
264 | 76094e37 | Michael Hanselmann | logging.debug("Resizing to %s workers", num_workers)
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265 | 76094e37 | Michael Hanselmann | |
266 | 76094e37 | Michael Hanselmann | current_count = len(self._workers) |
267 | 76094e37 | Michael Hanselmann | |
268 | 76094e37 | Michael Hanselmann | if current_count == num_workers:
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269 | 76094e37 | Michael Hanselmann | # Nothing to do
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270 | 76094e37 | Michael Hanselmann | pass
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271 | 76094e37 | Michael Hanselmann | |
272 | 76094e37 | Michael Hanselmann | elif current_count > num_workers:
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273 | 76094e37 | Michael Hanselmann | if num_workers == 0: |
274 | 76094e37 | Michael Hanselmann | # Create copy of list to iterate over while lock isn't held.
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275 | 76094e37 | Michael Hanselmann | termworkers = self._workers[:]
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276 | 76094e37 | Michael Hanselmann | del self._workers[:] |
277 | 76094e37 | Michael Hanselmann | else:
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278 | 76094e37 | Michael Hanselmann | # TODO: Implement partial downsizing
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279 | 76094e37 | Michael Hanselmann | raise NotImplementedError() |
280 | 76094e37 | Michael Hanselmann | #termworkers = ...
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281 | 76094e37 | Michael Hanselmann | |
282 | 76094e37 | Michael Hanselmann | self._termworkers += termworkers
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283 | 76094e37 | Michael Hanselmann | |
284 | 76094e37 | Michael Hanselmann | # Notify workers that something has changed
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285 | 53b1d12b | Michael Hanselmann | self._pool_to_worker.notifyAll()
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286 | 76094e37 | Michael Hanselmann | |
287 | 76094e37 | Michael Hanselmann | # Join all terminating workers
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288 | 76094e37 | Michael Hanselmann | self._lock.release()
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289 | 76094e37 | Michael Hanselmann | try:
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290 | 76094e37 | Michael Hanselmann | for worker in termworkers: |
291 | 76094e37 | Michael Hanselmann | worker.join() |
292 | 76094e37 | Michael Hanselmann | finally:
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293 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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294 | 76094e37 | Michael Hanselmann | |
295 | 76094e37 | Michael Hanselmann | # Remove terminated threads. This could be done in a more efficient way
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296 | 76094e37 | Michael Hanselmann | # (del self._termworkers[:]), but checking worker.isAlive() makes sure we
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297 | 76094e37 | Michael Hanselmann | # don't leave zombie threads around.
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298 | 76094e37 | Michael Hanselmann | for worker in termworkers: |
299 | 76094e37 | Michael Hanselmann | assert worker in self._termworkers, ("Worker not in list of" |
300 | 76094e37 | Michael Hanselmann | " terminating workers")
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301 | 76094e37 | Michael Hanselmann | if not worker.isAlive(): |
302 | 76094e37 | Michael Hanselmann | self._termworkers.remove(worker)
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303 | 76094e37 | Michael Hanselmann | |
304 | 76094e37 | Michael Hanselmann | assert not self._termworkers, "Zombie worker detected" |
305 | 76094e37 | Michael Hanselmann | |
306 | 76094e37 | Michael Hanselmann | elif current_count < num_workers:
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307 | 76094e37 | Michael Hanselmann | # Create (num_workers - current_count) new workers
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308 | 76094e37 | Michael Hanselmann | for i in xrange(num_workers - current_count): |
309 | 76094e37 | Michael Hanselmann | worker = self._worker_class(self, self._NewWorkerIdUnlocked()) |
310 | 76094e37 | Michael Hanselmann | self._workers.append(worker)
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311 | 76094e37 | Michael Hanselmann | worker.start() |
312 | 76094e37 | Michael Hanselmann | |
313 | 76094e37 | Michael Hanselmann | def Resize(self, num_workers): |
314 | 76094e37 | Michael Hanselmann | """Changes the number of workers in the pool.
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315 | 76094e37 | Michael Hanselmann |
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316 | 76094e37 | Michael Hanselmann | Args:
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317 | 76094e37 | Michael Hanselmann | - num_workers: New number of workers
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318 | 76094e37 | Michael Hanselmann |
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319 | 76094e37 | Michael Hanselmann | """
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320 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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321 | 76094e37 | Michael Hanselmann | try:
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322 | 76094e37 | Michael Hanselmann | return self._ResizeUnlocked(num_workers) |
323 | 76094e37 | Michael Hanselmann | finally:
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324 | 76094e37 | Michael Hanselmann | self._lock.release()
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325 | 76094e37 | Michael Hanselmann | |
326 | 76094e37 | Michael Hanselmann | def TerminateWorkers(self): |
327 | 76094e37 | Michael Hanselmann | """Terminate all worker threads.
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328 | 76094e37 | Michael Hanselmann |
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329 | 76094e37 | Michael Hanselmann | Unstarted tasks will be ignored.
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330 | 76094e37 | Michael Hanselmann |
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331 | 76094e37 | Michael Hanselmann | """
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332 | 76094e37 | Michael Hanselmann | logging.debug("Terminating all workers")
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333 | 76094e37 | Michael Hanselmann | |
334 | 76094e37 | Michael Hanselmann | self._lock.acquire()
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335 | 76094e37 | Michael Hanselmann | try:
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336 | 76094e37 | Michael Hanselmann | self._ResizeUnlocked(0) |
337 | 76094e37 | Michael Hanselmann | |
338 | 76094e37 | Michael Hanselmann | if self._tasks: |
339 | 76094e37 | Michael Hanselmann | logging.debug("There are %s tasks left", len(self._tasks)) |
340 | 76094e37 | Michael Hanselmann | finally:
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341 | 76094e37 | Michael Hanselmann | self._lock.release()
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342 | 76094e37 | Michael Hanselmann | |
343 | 76094e37 | Michael Hanselmann | logging.debug("All workers terminated") |