Fix bug in redis store when zero data stored but data does not exist #1304
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Note: This is unlikely to have been observed from the RBE API.
We are supposed to check if an item exists even if it has zero bytes stored in it, but since redis is quite tricky to do this, we were only checking existance if it was a zero byte digest or if the length was zero bytes. In this case we might have a zero-byte proto that is actually valid that does not follow the CAS rules (hash of contents equals key).
This is in prep for a Redis Scheduler.
fixes #1286
This change is