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Add a finalize round to multicast pinging #7924
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When sending a multicast ping, there is no way to determine how long it will take before all nodes will respond. Currently we send two pings (one at start, one after half timeout) and wait until the ping timeout has passed for all responses to come back. However, if all nodes are fast to respond, there is a gap relatively large between the moment that pings were gathered and the election that is based on them. This commits adds a last ping round (at timeout) where we know the number of nodes we expect to receive answers from. Once all nodes responded, we complete the pinging.
LGTM |
Just curious about the protocol you are implementing, it seems that you want to have a reliable multicast ping. what is the purpose for this ping? |
@iopenstack the multicast based discovery is primarily for development (and ease of) use. It's not recommended for production for the exact reason you stated. That said, we test it and every once while (rare) we out test fail because of this gap. |
bleskes
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Oct 2, 2014
When sending a multicast ping, there is no way to determine how long it will take before all nodes will respond. Currently we send two pings (one at start, one after half timeout) and wait until the ping timeout has passed for all responses to come back. However, if all nodes are fast to respond, there is a gap relatively large between the moment that pings were gathered and the election that is based on them. This commits adds a last ping round (at timeout) where we know the number of nodes we expect to receive answers from. Once all nodes responded, we complete the pinging. Closes #7924
bleskes
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Oct 2, 2014
When sending a multicast ping, there is no way to determine how long it will take before all nodes will respond. Currently we send two pings (one at start, one after half timeout) and wait until the ping timeout has passed for all responses to come back. However, if all nodes are fast to respond, there is a gap relatively large between the moment that pings were gathered and the election that is based on them. This commits adds a last ping round (at timeout) where we know the number of nodes we expect to receive answers from. Once all nodes responded, we complete the pinging. Closes #7924
clintongormley
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Discovery: add a finalize round to multicast pinging
Discovery: Add a finalize round to multicast pinging
Nov 3, 2014
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:Distributed/Discovery-Plugins
Anything related to our integration plugins with EC2, GCP and Azure
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Jun 7, 2015
clintongormley
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Discovery: Add a finalize round to multicast pinging
Add a finalize round to multicast pinging
Jun 7, 2015
mute
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Jul 29, 2015
When sending a multicast ping, there is no way to determine how long it will take before all nodes will respond. Currently we send two pings (one at start, one after half timeout) and wait until the ping timeout has passed for all responses to come back. However, if all nodes are fast to respond, there is a gap relatively large between the moment that pings were gathered and the election that is based on them. This commits adds a last ping round (at timeout) where we know the number of nodes we expect to receive answers from. Once all nodes responded, we complete the pinging. Closes elastic#7924
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Labels
:Distributed/Discovery-Plugins
Anything related to our integration plugins with EC2, GCP and Azure
>enhancement
resiliency
v1.4.0
v2.0.0-beta1
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When sending a multicast ping, there is no way to determine how long it will take before all nodes will respond. Currently we send two pings (one at start, one after half timeout) and wait until the ping timeout has passed for all responses to come back. However, if all nodes are fast to respond, there is a relatively large gap between the moment that pings were gathered and the election that is based on them. This commits adds a last ping round (at timeout) where we know the number of nodes we expect to receive answers from. Once all nodes responded, we complete the pinging.