本文整理汇总了Python中carbon.cache.MetricCache.items方法的典型用法代码示例。如果您正苦于以下问题：Python MetricCache.items方法的具体用法？Python MetricCache.items怎么用？Python MetricCache.items使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类carbon.cache.MetricCache的用法示例。
在下文中一共展示了MetricCache.items方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: optimalWriteOrder
# 需要导入模块: from carbon.cache import MetricCache [as 别名]
# 或者: from carbon.cache.MetricCache import items [as 别名]
def optimalWriteOrder():
"Generates metrics with the most cached values first and applies a soft rate limit on new metrics"
global lastCreateInterval
global createCount
metrics = [ (metric, len(datapoints)) for metric,datapoints in MetricCache.items() ]
t = time.time()
metrics.sort(key=lambda item: item[1], reverse=True) # by queue size, descending
log.msg("Sorted %d cache queues in %.6f seconds" % (len(metrics), time.time() - t))
for metric, queueSize in metrics:
dbFilePath = getFilesystemPath(metric)
dbFileExists = exists(dbFilePath)
if not dbFileExists:
createCount += 1
now = time.time()
if now - lastCreateInterval >= 60:
lastCreateInterval = now
createCount = 1
elif createCount >= settings.MAX_CREATES_PER_MINUTE:
continue
try: # metrics can momentarily disappear from the MetricCache due to the implementation of MetricCache.store()
datapoints = MetricCache.pop(metric)
except KeyError:
log.msg("MetricCache contention, skipping %s update for now" % metric)
continue # we simply move on to the next metric when this race condition occurs
yield (metric, datapoints, dbFilePath, dbFileExists)