Sketch out recursive merging for template mappings. #57393
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jtibshirani
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May 30, 2020
| assert mergeIntoMapper instanceof FieldMapper || mergeIntoMapper instanceof FieldAliasMapper; | ||
| // If we're merging template mappings when creating an index, then a field definition always | ||
| // replaces an existing one. | ||
| if (reason == MergeReason.INDEX_TEMPLATE) { |
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This is the most interesting part, we decide to overwrite leaf fields instead of merging them.
|
We've decided to go with this approach. I'm closing out this draft and will open a new PR for review. |
dakrone
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Jun 4, 2020
This commit changes the merge strategy introduced in elastic#55607 and elastic#55982. Instead of overwriting these fields, we now prevent them from being merged with an exception when a user attempts to overwrite a field. As part of this, a more robust validation has been added. The existing validation checked whether templates (composable and component) were valid on their own, this new validation now checks that the composite template (mappings/settings/aliases) is valid. This means that when a composable template is added or updated, we confirm that it is valid with its component pieces. When a component template is updated we ensure that all composable templates that make use of the component template continue to be valid before allowing the component template to be updated. This change also necessitated changes in the tests, however, I have left tests that exercise mapping merging with nested object fields as `@AwaitsFix`, as we intend to change the behavior soon to allow merging in a recursive-with-replacement fashion (see: elastic#57393). I have added tests that check the new disallowing behavior in the meantime.
dakrone
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) * Disallow merging existing mapping field definitions in templates This commit changes the merge strategy introduced in #55607 and #55982. Instead of overwriting these fields, we now prevent them from being merged with an exception when a user attempts to overwrite a field. As part of this, a more robust validation has been added. The existing validation checked whether templates (composable and component) were valid on their own, this new validation now checks that the composite template (mappings/settings/aliases) is valid. This means that when a composable template is added or updated, we confirm that it is valid with its component pieces. When a component template is updated we ensure that all composable templates that make use of the component template continue to be valid before allowing the component template to be updated. This change also necessitated changes in the tests, however, I have left tests that exercise mapping merging with nested object fields as `@AwaitsFix`, as we intend to change the behavior soon to allow merging in a recursive-with-replacement fashion (see: #57393). I have added tests that check the new disallowing behavior in the meantime. * Use functional instead of imperative prefix collection * Use IndexService.withTempIndexService * Rename tests * Fix tests Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
dakrone
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Jun 8, 2020
…stic#57701) * Disallow merging existing mapping field definitions in templates This commit changes the merge strategy introduced in elastic#55607 and elastic#55982. Instead of overwriting these fields, we now prevent them from being merged with an exception when a user attempts to overwrite a field. As part of this, a more robust validation has been added. The existing validation checked whether templates (composable and component) were valid on their own, this new validation now checks that the composite template (mappings/settings/aliases) is valid. This means that when a composable template is added or updated, we confirm that it is valid with its component pieces. When a component template is updated we ensure that all composable templates that make use of the component template continue to be valid before allowing the component template to be updated. This change also necessitated changes in the tests, however, I have left tests that exercise mapping merging with nested object fields as `@AwaitsFix`, as we intend to change the behavior soon to allow merging in a recursive-with-replacement fashion (see: elastic#57393). I have added tests that check the new disallowing behavior in the meantime. * Use functional instead of imperative prefix collection * Use IndexService.withTempIndexService * Rename tests * Fix tests Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
dakrone
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Jun 8, 2020
…stic#57701) * Disallow merging existing mapping field definitions in templates This commit changes the merge strategy introduced in elastic#55607 and elastic#55982. Instead of overwriting these fields, we now prevent them from being merged with an exception when a user attempts to overwrite a field. As part of this, a more robust validation has been added. The existing validation checked whether templates (composable and component) were valid on their own, this new validation now checks that the composite template (mappings/settings/aliases) is valid. This means that when a composable template is added or updated, we confirm that it is valid with its component pieces. When a component template is updated we ensure that all composable templates that make use of the component template continue to be valid before allowing the component template to be updated. This change also necessitated changes in the tests, however, I have left tests that exercise mapping merging with nested object fields as `@AwaitsFix`, as we intend to change the behavior soon to allow merging in a recursive-with-replacement fashion (see: elastic#57393). I have added tests that check the new disallowing behavior in the meantime. * Use functional instead of imperative prefix collection * Use IndexService.withTempIndexService * Rename tests * Fix tests Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
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Note: this is just a sketch, and not an actual PR for review.
This is a prototype for how we could support recursive merging for composable template mappings. I wrote this really quickly, we may want to factor things differently (also there are no tests!)
The overall approach:
MapperService#merge.ObjectMapperreplaces leaf fields instead of merging them.I really liked that this approach unifies all mapping merging under the same set of concepts. Before, we treated composable template mappings as raw maps, and had custom logic for deduplicating dynamic templates and resolving dots in field names.