Deduplicate Index Metadata in BlobStore (#50278) #59514
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This PR introduces two new fields in to `RepositoryData` (index-N) to track the blob name of `IndexMetaData` blobs and their content via setting generations and uuids. This is used to deduplicate the `IndexMetaData` blobs (`meta-{uuid}.dat` in the indices folders under `/indices` so that new metadata for an index is only written to the repository during a snapshot if that same metadata can't be found in another snapshot.
This saves one write per index in the common case of unchanged metadata thus saving cost and making snapshot finalization drastically faster if many indices are being snapshotted at the same time.
The implementation is mostly analogous to that for shard generations in elastic#46250 and piggy backs on the BwC mechanism introduced in that PR (which means this PR needs adjustments if it doesn't go into `7.6`).
Relates to elastic#45736 as it improves the efficiency of snapshotting unchanged indices
Relates to elastic#49800 as it has the potential of loading the index metadata for multiple snapshots of the same index concurrently much more efficient speeding up future concurrent snapshot delete
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Disabling BwC tests so that elastic#59514 can be merged.
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Now that elastic#59514 has been merged we can reenable BwC tests.
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This PR introduces two new fields in to
RepositoryData(index-N) to track the blob name ofIndexMetaDatablobs and their content via setting generations and uuids. This is used to deduplicate theIndexMetaDatablobs (meta-{uuid}.datin the indices folders under/indicesso that new metadata for an index is only written to the repository during a snapshot if that same metadata can't be found in another snapshot.This saves one write per index in the common case of unchanged metadata thus saving cost and making snapshot finalization drastically faster if many indices are being snapshotted at the same time.
The implementation is mostly analogous to that for shard generations in #46250 and piggy backs on the BwC mechanism introduced in that PR (which means this PR needs adjustments if it doesn't go into
7.6).Relates to #45736 as it improves the efficiency of snapshotting unchanged indices
Relates to #49800 as it has the potential of loading the index metadata for multiple snapshots of the same index concurrently much more efficient speeding up future concurrent snapshot delete
backport of #50278