Representation bandwidth based cache Response detection timeout #4546
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- Added new bandwidth_ratio metric which is a ratio of the current representation's bandwidth to the top representation - This bandwidth_ratio is used to adjust the timeout used in the cache detection algorithm so it doesn't incorrectly trigger for lower representations. - This is on the assumption that the cacheLoadThresholds represent the time for a top representation bandwidth segment to be delivered
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Thanks @piersoh for the PR. Two immediate comments:
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I merged |
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Thanks for the changes @piersoh . I did some tests with our default Big Buck Bunny content (https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd). In my tests the changes lead to problems with the cache detection as the increase of the 
In the example above, the video segments are all served from the cache. However, the new How did you verify these changes? |
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This update changes the cached Response detection algorithm in the ThroughputModel so that it adjusts the cacheLoadThresholds according to the ratio of the bandwidth of the representation that has been downloaded to the top representation, as opposed to just using one threshold for all reps which can lead to incorrect cached response detection. This is on the assumption that the cacheLoadThresholds represent the time for a top representation bandwidth segment to be delivered.
bandwidth_ratiometric which is a ratio of the current representation's bandwidth to the top representationbandwidth_ratiois used to adjust the timeout used in the cache detection algorithm so it doesn't incorrectly trigger for lower representations.