Github user yvsubhash commented on the issue:
https://github.com/apache/cloudstack/pull/1726
@ustcweizhou As I understand, Volume goes to Expunged state when it is
removed from primary and gets removed when it is removed from secondary
storage. line 2211 to 2215 is to handle specific case where volume getting
removed from primary But not getting removed from secondary because of the
download link. So cleaning up the same after the downlink is expired
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