support generating new image with separate blob for prefetched files #1649
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Major changes: 1. Added compatibility for rafs v5/v6 formats. 2. Set IS_PREFETCHBLOB flag in BlobInfo for prefetchblob. 3. Introduced two new options for storing prefetchblobID path and the optimized bootstrap path. Signed-off-by: Xing Ma <[email protected]>
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We can statically analyze the image entrypoint dependency, or use runtime dynamic analysis technologies such as ebpf, fanotify, metric, etc. to obtain the container file access pattern, and then build this part of data into an independent image layer: * preferentially fetch blob during the image startup phase to reduce network and disk IO. * avoid frequent image builds, allows for better local cache utilization. Implement optimize subcommand of nydusify to generate a new image, which references a new blob included prefetch file chunks. ``` nydusify optimize --policy separated-prefetch-blob \ --source $existed-nydus-image \ --target $new-nydus-image \ --prefetch-files /path/to/prefetch-files ``` More detailed process is as follows: 1. nydusify first downloads the source image and bootstrap, utilize nydus-image to output a new bootstrap along with an independent prefetchblob; 2. nydusify generate&push new meta layer including new bootstrap and the prefetch-files , also generates&push new manifest/config/prefetchblob, completing the incremental image build. Signed-off-by: Xing Ma <[email protected]>
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1649 +/- ##
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- Coverage 60.10% 59.98% -0.13%
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Files 147 147
Lines 49513 49603 +90
Branches 46994 47057 +63
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- Hits 29762 29756 -6
- Misses 17970 18065 +95
- Partials 1781 1782 +1
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Relevant Issue #1589
The objective is to generate a new image, which references a new blob included prefetch file chunks. This will accelerate an startup performance due to high-priority pulling of prefetch blob.
Details
Implement optimize subcommand of nydusify to generate a new image, which references a new blob included prefetch file chunks.
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