[QTL] Query time lookup cluster wide config#1576
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I'm considering moving this to a module, so don't get caught up on it being in mainline druid
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Will remove these version changes shortly.
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Closing for now |
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| # Lookups Dynamic Config (EXPERIMENTAL) | ||
| Thse configuration options control the behavior of the Lookup dynamic configuration described in the [lookups page](../querying/lookups.html) |
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have finished reviewing this PR -
I am 👍 on this and think this can be merged once 1 is taken care of unless @b-slim has any more comments. |
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Squashed |
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I'll undo these, give me a sec
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duplicated LifecycleModule.register(binder, LookupReferencesManager.class)
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good call, artifact of merging module definitions. Fixed
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👍 please make sure to have the issue linked to the future improvement especially about initialization. |
This was referenced Mar 18, 2016
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[QTL] Query time lookup cluster wide config
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This is the next PR for QTL where cluster wide configuration is possible.
This approach uses POSTs from the coordinator to populate QTL information in all interested nodes. Interested nodes "register" via the Announcer (currently ZK based). But all communication occurs through HTTP directly between the coordinator and the node.
The PR lists over 4k lines, but a LOT of that is tests.
TODO:Ready to mergeProposal for coordinator and node endpointsSquash (Leaving change log while reviews are occurring)DocsPunted until extensions are updatedMigrate coordinator code to a module.Figure out a better way to handle the listening handling. (see Add listening-announcer extension #2286 )added in this PR in coreMigrate lookup config to auditable config type.Rebase on Promoting LookupExtractor state and LookupExtractorFactory to be a first class druid state object. #2291Move core stuff and extension stuff to its own commitMake sure put functions as expected. (I don't think deleting actually works in this version)Make sure initialization behaves as expectedActually run the thing locallyReconcile need for static config vs dynamic config. Ex: what happens if someone requests a delete or get of a lookup defined in runtime.properties?No static configMore unit tests for delete funcitonMake timeouts configurabledoneDocument historical node endpoints as advanced featureDocument experimental update aspectAdded javadoc forreplacesaddition toLookupExtractorFactoryKNOWN ISSUES:
Currently if someone manually goes in and modifies lookups on a lookup node, the cluster wide config will attempt to re-populate that node. The way to get around this behavior is to add the lookups to the node independent of cluster-wide config.
The lookup coordinator does try to delete lookups that were removed from the config.
THERE IS A MAJOR CAVEAT HERE: If a node's network is disconnected during this delete (or it is otherwise temporarily unavailable) there is no good way for the coordinator to know that, when it can communicate with the node again, if the
some_lookupis has is supposed to be there as a custom config, or ifsome_lookupis there from a failed delete.Such an occurrence should be RARE in the current IMPL though.