Native ETag Support #675
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Native ETag Support #675
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hamdaankhalid
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TedHartMS
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Oct 1, 2024
hamdaankhalid
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Dec 28, 2024
hamdaankhalid
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Jan 6, 2025
| @@ -98,6 +98,8 @@ private bool NetworkEXEC() | |||
| private bool NetworkSKIP(RespCommand cmd) | |||
| { | |||
| // Retrieve the meta-data for the command to do basic sanity checking for command arguments | |||
| // Normalize will turn internal "not-real commands" such as SETEXNX, and SETEXXX to the command info parent | |||
| cmd = cmd.Normalize(); | |||
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this fixes the issue that wouldnt let XX, NX, and as a result SETIFMATCH and SET + WITHETAG work inside of multi exec
darrenge
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Jan 7, 2025
hamdaankhalid
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Jan 8, 2025
badrishc
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Jan 8, 2025
badrishc
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Jan 8, 2025
badrishc
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Jan 8, 2025
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Native ETag Support
Garnet provides support for ETags on raw strings. You can associate any string-based key-value pair inserted into Garnet with an automatically updated ETag.
Compatibility with non-ETag commands and the behavior of data inserted with ETags are detailed in the markdown for garnet specific commands. Please read the markdown file for API contracts, and compatibility.
HLD:
RecordInfofor a record indicated whether or not a record contains an ETag. This bit on the record info is used to indicate that the first 8 bytes of the payload of the record include a long data type that represents the eTag associated with the value that is present after the first 8 bytes.Reads don't modify the eTag, but any RMW operations do. Blind Upsert (SET) will remove the eTag unless sent with the WITHETAG flag.
ETags are incremented on each update, and the user can use them to handle things such as caching and Optimistic concurrency control.