Discovery: back port #7558 to 1.x and add bwc protections of the new ping on master gone introduced in #7493 #7694
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clintongormley
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…e cluster for the first time With the change in elastic#7493, we introduced a pinging round when a master nodes goes down. That pinging round helps validating the current state of the cluster and takes, by default, 3 seconds. It may be that during that window, a new node tries to join the cluster and starts pinging (this is typical when you quickly restart the current master). If this node gets elected as the new master it will force recovery from the gateway (it has no in memory cluster state), which in turn will cause a full cluster shard synchronisation. While this is not a problem on it's own, it's a shame. This commit demotes "new" nodes during master election so the will only be elected if really needed. Closes elastic#7558
…he new ping on master gone introduced in elastic#7493 The change in elastic#7558 adds a flag to PingResponse. However, when unicast discovery is used, this extra flag can not be serialized by the very initial pings as they do not know yet what node version they ping (i.e., they have to default to 1.0.0, which excludes changing the serialization format). This commit bypasses this problem by adding a dedicated action which only exist on nodes of version 1.4 or up. Nodes first try to ping this endpoint using 1.4.0 as a serialization version. If that fails they fall back to the pre 1.4.0 action. This is optimal if all nodes are on 1.4.0 or higher, with a small down side if the cluster has mixed versions - but this is a temporary state. Further two bwc protections are added: 1) Disable the preference to nodes who previously joined the cluster if some of the pings are on version < 1.4.0 2) Disable the rejoin on master gone functionality if some nodes in the cluster or version < 1.4.0
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| public DiscoveryNode master() { | ||
| return master; | ||
| } | ||
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| /** true if the joined has successfully joined the cluster before, null for nodes with a <1.4.0 version */ |
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I think I am fine with it LGTM |
bleskes
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…he new ping on master gone introduced in elastic#7493 The change in elastic#7558 adds a flag to PingResponse. However, when unicast discovery is used, this extra flag can not be serialized by the very initial pings as they do not know yet what node version they ping (i.e., they have to default to 1.0.0, which excludes changing the serialization format). This commit bypasses this problem by adding a dedicated action which only exist on nodes of version 1.4 or up. Nodes first try to ping this endpoint using 1.4.0 as a serialization version. If that fails they fall back to the pre 1.4.0 action. This is optimal if all nodes are on 1.4.0 or higher, with a small down side if the cluster has mixed versions - but this is a temporary state. Further two bwc protections are added: 1) Disable the preference to nodes who previously joined the cluster if some of the pings are on version < 1.4.0 2) Disable the rejoin on master gone functionality if some nodes in the cluster or version < 1.4.0 Closes elastic#7694
bleskes
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…ping on master gone introduced in #7493 The change in #7558 adds a flag to PingResponse. However, when unicast discovery is used, this extra flag can not be serialized by the very initial pings as they do not know yet what node version they ping (i.e., they have to default to 1.0.0, which excludes changing the serialization format). This commit bypasses this problem by adding a dedicated action which only exist on nodes of version 1.4 or up. Nodes first try to ping this endpoint using 1.4.0 as a serialization version. If that fails they fall back to the pre 1.4.0 action. This is optimal if all nodes are on 1.4.0 or higher, with a small down side if the cluster has mixed versions - but this is a temporary state. Further two bwc protections are added: 1) Disable the preference to nodes who previously joined the cluster if some of the pings are on version < 1.4.0 2) Disable the rejoin on master gone functionality if some nodes in the cluster or version < 1.4.0 Closes #7694
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merged in 1.x & 1.4 |
mute
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Jul 29, 2015
…he new ping on master gone introduced in elastic#7493 The change in elastic#7558 adds a flag to PingResponse. However, when unicast discovery is used, this extra flag can not be serialized by the very initial pings as they do not know yet what node version they ping (i.e., they have to default to 1.0.0, which excludes changing the serialization format). This commit bypasses this problem by adding a dedicated action which only exist on nodes of version 1.4 or up. Nodes first try to ping this endpoint using 1.4.0 as a serialization version. If that fails they fall back to the pre 1.4.0 action. This is optimal if all nodes are on 1.4.0 or higher, with a small down side if the cluster has mixed versions - but this is a temporary state. Further two bwc protections are added: 1) Disable the preference to nodes who previously joined the cluster if some of the pings are on version < 1.4.0 2) Disable the rejoin on master gone functionality if some nodes in the cluster or version < 1.4.0 Closes elastic#7694
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The change in #7558 adds a flag to PingResponse. However, when unicast discovery is used, this extra flag can not be serialized by the very initial pings as they do not know yet what node version they ping (i.e., they have to default to 1.0.0, which excludes changing the serialization format). This commit bypasses this problem by adding a dedicated action which only exist on nodes of version 1.4 or up. Nodes first try to ping this endpoint using 1.4.0 as a serialization version. If that fails they fall back to the pre 1.4.0 action. This is optimal if all nodes are on 1.4.0 or higher, with a small down side if the cluster has mixed versions - but this is a temporary state.
Further two bwc protections are added: