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reverts wide fanout in broadcast when the root node is down (backport #26359)#27183
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mergify[bot] merged 1 commit intov1.11from Aug 16, 2022
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reverts wide fanout in broadcast when the root node is down (backport #26359)#27183mergify[bot] merged 1 commit intov1.11from
mergify[bot] merged 1 commit intov1.11from
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A change included in #20480 was that when the root node in turbine broadcast tree is down, the leader will broadcast the shred to all nodes in the first layer. The intention was to mitigate the impact of dead nodes on shreds propagation, because if the root node is down, then the entire cluster will miss out the shred. On the other hand, if x% of stake is down, this will cause 200*x% + 1 packets/shreds ratio at the broadcast stage which might contribute to line-rate saturation and packet drop. To avoid this bandwidth saturation issue, this commit reverts that logic and always broadcasts shreds from the leader only to the root node. As before we rely on erasure codes to recover shreds lost due to staked nodes being offline. (cherry picked from commit 3b87aa9)
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This is an automatic backport of pull request #26359 done by Mergify.
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