Remove file field from CacheFileReference #51520
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`CacheFileReference#file` is a path to a file that doesn't exist, for use as a cache key, but whose parent directory is the location of the actual cache file. This commit replaces it with the path to the cache directory itself, and computes the cache key when it is needed.
DaveCTurner
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>non-issue
:Distributed Coordination/Snapshot/Restore
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Pinging @elastic/es-distributed (:Distributed/Snapshot/Restore) |
tlrx
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Jan 28, 2020
tlrx
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Jan 31, 2020
Today cache files are identified in cache using a string representing an absolute path to a file on disk. This path is a sub directory of the current shard data path and as such already contains identification bits like the current index id and the shard id. It also contains the snapshot id that is passed at CacheDirectory creation time. While this has been done for quick prototyping and already been improved in #51520, it feels wrong to rely on a path converted to a string as cache keys. Instead we should have a distinct CacheKey object to identify CacheFile in cache. Relates #50693
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CacheFileReference#fileis a path to a file that doesn't exist, for use as acache key, but whose parent directory is the location of the actual cache file.
This commit replaces it with the path to the cache directory itself, and
computes the cache key when it is needed.
Relates #50693.