Use Cluster State to Track Repository Generation (#49729)#49976
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original-brownbear merged 1 commit intoelastic:7.xfrom Dec 9, 2019
original-brownbear:49729-7.x
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Use Cluster State to Track Repository Generation (#49729)#49976original-brownbear merged 1 commit intoelastic:7.xfrom original-brownbear:49729-7.x
original-brownbear merged 1 commit intoelastic:7.xfrom
original-brownbear:49729-7.x
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Step on the road to #49060. This commit adds the logic to keep track of a repository's generation across repository operations. See changes to package level Javadoc for the concrete changes in the distributed state machine. It updates the write side of new repository generations to be fully consistent via the cluster state. With this change, no `index-N` will be overwritten for the same repository ever. So eventual consistency issues around conflicting updates to the same `index-N` are not a possibility any longer. With this change the read side will still use listing of repository contents instead of relying solely on the cluster state contents. The logic for that will be introduced in #49060. This retains the ability to externally delete the contents of a repository and continue using it afterwards for the time being. In #49060 the use of listing to determine the repository generation will be removed in all cases (except for full-cluster restart) as the last step in this effort.
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Disabling BwC tests so elastic#49976 can be merged.
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With elastic#49976 merged we can reenable BwC tests.
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Step on the road to #49060.
This commit adds the logic to keep track of a repository's generation
across repository operations. See changes to package level Javadoc for the concrete changes in the distributed state machine.
It updates the write side of new repository generations to be fully consistent via the cluster state. With this change, no
index-Nwill be overwritten for the same repository ever. So eventual consistency issues around conflicting updates to the sameindex-Nare not a possibility any longer.With this change the read side will still use listing of repository contents instead of relying solely on the cluster state contents.
The logic for that will be introduced in #49060. This retains the ability to externally delete the contents of a repository and continue using it afterwards for the time being. In #49060 the use of listing to determine the repository generation will be removed in all cases (except for full-cluster restart) as the last step in this effort.
backport of #49729