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<DIV><FONT color=#000000 size=3 face=宋体>Hi, guys.</FONT></DIV>
<DIV><FONT color=#000000 size=3></FONT> </DIV>
<DIV><FONT color=#000000 size=3>I found something confused when I studied
resource tracking in Nova. In resource_tracker.py, the function
'_update_usage_from_instances()' made a clear reset to 'self.traced_instaces'
and 'resources'. And then for each instance, function
'_update_usage_from_instance()' is called to update resources stats
.</FONT></DIV>
<DIV><FONT color=#000000 size=3></FONT> </DIV>
<DIV><FONT color=#000000 size=3>There is the question:</FONT></DIV>
<DIV><FONT color=#000000 size=3>Because function
'_update_usage_from_instances()' has made a clear reset, every instance passed
to '_update_usage_from_instance()' must be a new
instance(is_new_instance=True). And to a new instance, 'sign' is set to 1.
This's just ok. But there are a special situation that instance may be deleted
here. Other words, a instance may be meanwhile new and deleted. In my
understanding, for deleted instance, We should do nothing in resources stats.
But for deleted instance, 'sign' is set to -1, not my expected 0. </FONT></DIV>
<DIV>Why? Is this a bug or something? </DIV>
<DIV> </DIV>
<DIV>Any help is appreciated. Thanks.</DIV></FONT></DIV>
<DIV> </DIV>
<DIV align=left><FONT color=#c0c0c0 size=2
face=Verdana>2012-11-14</FONT></DIV><FONT size=2 face=Verdana>
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<DIV><FONT color=#c0c0c0 size=2 face=Verdana><SPAN
id=_FlashSignName>hzguanqiang</SPAN></FONT></DIV></STATIONERY></BODY></HTML>