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New Index format that contains the hashing algorithm information #214

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masih opened this issue Aug 27, 2021 · 0 comments · Fixed by #217
Closed

New Index format that contains the hashing algorithm information #214

masih opened this issue Aug 27, 2021 · 0 comments · Fixed by #217
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masih commented Aug 27, 2021 •
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The current IndexSorted format contains the digest of the CIDs within in a CAR and offset to where the data is located. This format does not contain enough information to reconstruct list of multihashes in the CAR from index alone, because it does not store the hash function used to generate the digests.

Data providers to indexer nodes should ideally be able to use the CAR index alone to supply the list of CIDs in a CAR without having to scan the entire CAR file. When data providers run as part of FileCoin miners, there will be indeed cases where the only accessible information about a CAR is its detached index.

Since for indexing purposes, the codec information in CID is ignored (see ipfs/kubo#6815) the CAR index should at least expose the hash function used to generate the digests within the index. This way the data providers are able to re-construct the list of CAR multihashes.
masih added a commit to multiformats/multicodec that referenced this issue Sep 2, 2021
@masih
Add CARv2 MultihashIndexSorted codec
37658aa 
Define a new codec for CARv2 `MultihashIndexSorted`.

See:
- ipld/go-car#217
- ipld/go-car#214
@masih masih mentioned this issue Sep 2, 2021
Merged
masih added a commit to multiformats/multicodec that referenced this issue Sep 2, 2021
@masih
Add CARv2 MultihashIndexSorted codec
b708c24 
Define a new codec for CARv2 `MultihashIndexSorted`.

See:
- ipld/go-car#217
- ipld/go-car#214
masih added a commit that referenced this issue Sep 2, 2021
@masih
Implement new index type that also includes mutltihash code
c28358b 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Note, there is a need for a multicodec to be defined for the new index
type. For now TODOs are left since it requires coordination across
repos.

Relates to:
- multiformats/multicodec#227

Fixes:
- #214
@masih masih mentioned this issue Sep 2, 2021
Merged
masih added a commit that referenced this issue Sep 2, 2021
@masih
Implement new index type that also includes mutltihash code
ac2b95a 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Note, there is a need for a multicodec to be defined for the new index
type. For now TODOs are left since it requires coordination across
repos.

Relates to:
- multiformats/multicodec#227

Fixes:
- #214
@masih masih self-assigned this Sep 2, 2021
masih added a commit to multiformats/multicodec that referenced this issue Sep 2, 2021
@masih
Add CARv2 MultihashIndexSorted codec
1bcdc08 
Define a new codec for CARv2 `MultihashIndexSorted`.

See:
- ipld/go-car#217
- ipld/go-car#214
masih added a commit to multiformats/go-multicodec that referenced this issue Sep 2, 2021
@masih
Update multicodec submodule to 1bcdc08 for CARv2 index codec
3b31752 
Update submodule to `1bcdc083898abb3e92b132f951e0a2fe0dcd485b`.

Run `go generate`.

Note, the code generation includes other changes to the codec table that
have been merged but not generated here.

See:
- multiformats/multicodec#227
- multiformats/multicodec@1bcdc08
- ipld/go-car#214
@masih masih mentioned this issue Sep 2, 2021
Merged
masih added a commit to multiformats/go-multicodec that referenced this issue Sep 2, 2021
@masih
Update multicodec submodule to 1bcdc08 for CARv2 index codec
ec9dcab 
Update submodule to `1bcdc083898abb3e92b132f951e0a2fe0dcd485b`.

Run `go generate`.

Note, the code generation includes other changes to the codec table that
have been merged but not generated here.

See:
- multiformats/multicodec#227
- multiformats/multicodec@1bcdc08
- ipld/go-car#214
masih added a commit to multiformats/go-multicodec that referenced this issue Sep 2, 2021
@masih
Update multicodec submodule to 1bcdc08 for CARv2 index codec
1539a07 
Update submodule to `1bcdc083898abb3e92b132f951e0a2fe0dcd485b`.

Run `go generate`.

Note, the code generation includes other changes to the codec table that
have been merged but not generated here.

See:
- multiformats/multicodec#227
- multiformats/multicodec@1bcdc08
- ipld/go-car#214
masih added a commit that referenced this issue Sep 2, 2021
@masih
Implement new index type that also includes mutltihash code
276d94a 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Relates to:
- multiformats/multicodec#227

Fixes:
- #214
masih added a commit that referenced this issue Sep 7, 2021
@masih
Implement new index type that also includes mutltihash code
ce2e998 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. The new index builds on top of the
existing `IndexSorted` by adding an additional layer of grouping the
multi-width indices by their multihash code.

Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Relates to:
- multiformats/multicodec#227

Fixes:
- #214
@masih masih closed this as completed in #217 Sep 7, 2021
masih added a commit that referenced this issue Sep 7, 2021
@masih
Implement new index type that also includes mutltihash code
42b9e28 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. The new index builds on top of the
existing `IndexSorted` by adding an additional layer of grouping the
multi-width indices by their multihash code.

Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Relates to:
- multiformats/multicodec#227

Fixes:
- #214
Jorropo pushed a commit to ipfs/boxo that referenced this issue Mar 22, 2023
@masih
Implement new index type that also includes mutltihash code
631b819 
Implement a new CARv2 index that contains enough information to
reconstruct the multihashes of the data payload, since `CarIndexSorted`
only includes multihash digests. The new index builds on top of the
existing `IndexSorted` by adding an additional layer of grouping the
multi-width indices by their multihash code.

Note, this index intentionally ignores
any given record with `multihash.IDENTITY` CID hash.

Add a test that asserts offsets for the same CID across sorted index and
new multihash sorted index are consistent.

Add tests that assert marshal unmarshalling of the new index type is as
expected, and it does not load records with `multihash.IDENTITY` digest.

Relates to:
- multiformats/multicodec#227

Fixes:
- ipld/go-car#214


This commit was moved from ipld/go-car@42b9e28
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Implement new index type that also includes mutltihash code ipld/go-car
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