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Generally all workflows in the Rialto repository are reliable, however, the build_ut and valgrind_ut workflows occasionally suffer from a failure in the github caching mechanism.
Signs of failure:
On ut workflow runs, you will see a success failure in the 'Download and Cache Protobuf' step, but the 'Build and test build_ut' timeout. Analysing the 'Build and test build_ut' job. Analysing this job, you will see that the 'Cache Install protobuf library' fails because it timeout when it tries to install protobuf library.
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The proptobuf cache is corrupt. The cache flag 'cache-protobuf-2' is true because the job sees a protobuf library in the cache, thus, 'Download and Cache ProtobufBuild protobuf library' step succeeds instantly. However, when the 'Build and test build_ut' job Download and Cache Protobuf' job goes to install the protobuf library, the install step notices that the build isn't right and so re-builds the library, this can take 12-15mins. For some reason the cache is getting corrupted after ~6weeks, this is a github issue.
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3. Delete the protobuf cache on the master branch.
4. Optional - Re-run failed test.
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