understanding how Burrow does calculations for Kafka lags -


i'm trying understand how burrow lines time end offset of log polled @ commit_time in __consumer_offsets topic.

let polled log end offset topica partition 2 @ 4/6/17 7:00:08.120 , got value of 659256972

now lets offset topic in partition in __consumer_offsets 659257652 commit time of 4/6/17 7:00:08.922....so lag 659256972 - 659257652 = -680 during time bucket (1s) 4/6/17 7:00:08...correct?

this happening because logoffset polled earlier when consumer offset committed __consumer_offset time bucket of 4/6/17 7:00:08.

how burrow handle this?

i guess broader...how tool claims calculate lag via brokers handle this?


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