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59 lines
2.7 KiB
Markdown
59 lines
2.7 KiB
Markdown
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# Parallel / Batched Workers
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Running linters in parallel, and if possible in batch to speed up the linting process.
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This is an experimental feature, and is not enabled by default, but it is really fast if you enable it and have the linter support implemented.
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Since it is a parallel version, it might not be possible to reproduce a line-by-line match of serial output.
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In order to maximize compatibility to programs using output of super-linter, the following are guarenteed:
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- Every linter error reported in serial version is reported by parallel version [^linter-error];
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- Super-linter log-level WARN and above that appears in serial version should appear in this version;
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- Super-linter log-level INFO and above do not interleave between linter output;
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- Failed file count logged at the end of super-linter matches serial version;
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[^linter-error]: Statistics are almost impossible to reproduce, e.g. was always `1 file linted, K errors` but now `M files linted, K errors`, I guess it is fine as the stat for linting 1 file produced by linter is not very useful.
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## Motivation
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Some linter might have a high startup cost, e.g.
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- `eslint` with some popular frontend framework plugins requires reading thousands of js files to init
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- `cfn-lint` which requires reading the whole cloudformation spec to run
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A lot of linter supports linting multiple files per invocation, i.e. `<linter-name> file1 file2 file3 ...`, which can be leveraged to reduce the startup overhead.
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Modern CI/CD might be on a multi-core machine, so running multiple linters in parallel can also speed up linting process, shorten the time taken from push to deploy.
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Shift-left paradigm encourages running linters in the IDE, for example in `.githooks/pre-commit`, linting need to be fast for good Developer experience.
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## Supported linters
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| Linter | Batch | Parallel | Notes |
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| -------- | ----- | -------- | --------------------------- |
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| cfn-lint | o | o | |
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| ESLint | o | o | |
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| gitleaks | | o | Batch unsupported by linter |
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## Architecture
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By setting `EXPERIMENTAL_BATCH_WORKER=true`, the following code path will be enabled:
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```bash
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# ../worker.sh
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LintCodebase
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# ./${LinterName}.sh
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# TASK: Modify linter command for batch, parallelization and batching parameters suitable for the linter
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ParallelLintCodebase${LinterName}
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# ./base.sh
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# gnu parallel run
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ParallelLintCodebaseImpl
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# ./${LinterName}.sh
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# TASK: see ./base.sh
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LintCodebase${LinterName}StdoutParser
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# ./${LinterName}.sh
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# TASK: see ./base.sh
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LintCodebase${LinterName}StderrParser
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# ./base.sh if the default works for you
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LintCodebaseBaseStderrParser
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```
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