aho135 opened a new pull request, #19191: URL: https://github.com/apache/druid/pull/19191
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I plan to implement Kinesis and Rabbit in subsequent PR's, followed by documentation for the new feature. This change introduces a new parameter called `backfill` to the SupervisorResource reset endpoint. If left unset the current reset behavior remains unchanged. When set to true, after the reset is performed, new ingestion tasks will be spun up to consume the skipped data. This is a useful feature for operating Druid clusters where the most recent data is the most important (such as alerting use cases). <!-- Replace XXXX with the id of the issue fixed in this PR. Remove this section if there is no corresponding issue. Don't reference the issue in the title of this pull-request. --> <!-- If you are a committer, follow the PR action item checklist for committers: https://github.com/apache/druid/blob/master/dev/committer-instructions.md#pr-and-issue-action-item-checklist-for-committers. --> ### Description Adds a parameter called `backfill` to the Supervisor reset endpoint to automatically ingest skipped data in the case where the offset is reset to latest. This requires useEarliestOffset=false, useConcurrentLocks=true because there can be conflicting time intervals between the backfill task and the main supervisor tasks, useTransaction=false in order to disable metadata updates, and the Supervisor needs to be in a running state in order to call `updatePartitionLagFromStream()` to get the latest offsets In addition, this change supports unsupervised SeekableStreamIndexTasks by setting `supervised: false` in the SeekableStreamIndexTaskIOConfig. The backfill tasks are one-off task submissions so this new flag disables any checkpointing (refer to changes in SeekableStreamIndexTaskRunner) The number of backfill tasks can be controlled through `backfillTaskCount` in the Supervisor spec, and defaults to taskCount / 2 <!-- Describe the goal of this PR, what problem are you fixing. If there is a corresponding issue (referenced above), it's not necessary to repeat the description here, however, you may choose to keep one summary sentence. --> <!-- Describe your patch: what did you change in code? How did you fix the problem? --> <!-- If there are several relatively logically separate changes in this PR, create a mini-section for each of them. For example: --> <!-- In each section, please describe design decisions made, including: - Choice of algorithms - Behavioral aspects. What configuration values are acceptable? How are corner cases and error conditions handled, such as when there are insufficient resources? - Class organization and design (how the logic is split between classes, inheritance, composition, design patterns) - Method organization and design (how the logic is split between methods, parameters and return types) - Naming (class, method, API, configuration, HTTP endpoint, names of emitted metrics) --> <!-- It's good to describe an alternative design (or mention an alternative name) for every design (or naming) decision point and compare the alternatives with the designs that you've implemented (or the names you've chosen) to highlight the advantages of the chosen designs and names. --> <!-- If there was a discussion of the design of the feature implemented in this PR elsewhere (e. g. a "Proposal" issue, any other issue, or a thread in the development mailing list), link to that discussion from this PR description and explain what have changed in your final design compared to your original proposal or the consensus version in the end of the discussion. If something hasn't changed since the original discussion, you can omit a detailed discussion of those aspects of the design here, perhaps apart from brief mentioning for the sake of readability of this PR description. --> <!-- Some of the aspects mentioned above may be omitted for simple and small changes. --> #### Release note Adds an optional parameter to the Supervisor reset endpoint to backfill the skipped data when the stream is reset to latest <!-- Give your best effort to summarize your changes in a couple of sentences aimed toward Druid users. If your change doesn't have end user impact, you can skip this section. For tips about how to write a good release note, see [Release notes](https://github.com/apache/druid/blob/master/CONTRIBUTING.md#release-notes). --> <hr> ##### Key changed/added classes in this PR * `SupervisorResource` * `SupervisorManager` * `SeekableStreamSupervisor` * `KafkaSupervisor` <hr> <!-- Check the items by putting "x" in the brackets for the done things. Not all of these items apply to every PR. Remove the items which are not done or not relevant to the PR. None of the items from the checklist below are strictly necessary, but it would be very helpful if you at least self-review the PR. --> This PR has: - [X] been self-reviewed. - [X] using the [concurrency checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md) (Remove this item if the PR doesn't have any relation to concurrency.) - [ ] added documentation for new or modified features or behaviors. [I plan to add documentation for this feature in a follow-up after Rabbit/Kinesis are implemented] - [X] a release note entry in the PR description. - [X] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links. - [X] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader. - [X] added unit tests or modified existing tests to cover new code paths, ensuring the threshold for [code coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md) is met. - [ ] added integration tests. - [X] been tested in a test Druid cluster. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
